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## Sitemaps
[XML Sitemap](https://www.hsahglass.com/sitemap_index.xml): Includes all crawlable and indexable pages.

## Posts
- [Gauge glass is used In bolier](https://www.hsahglass.com/applications/gauge-glass-is-used-in-bolier/): We have excellent skills and experience in producing high quality, precision-engineered glass.
- [Type Level Gauge Sight Glass: A Vital Tool in Industrial Liquid Level Monitoring](https://www.hsahglass.com/applications/type-level-gauge-sight-glass/): In industrial operations, accurate liquid level monitoring is essential. It ensures smooth production, enhances safety, and prevents costly equipment failures. Among the many tools used for this purpose, the Type Level Gauge Sight Glass is one of the most reliable and easy-to-use options. This article explores how it works, the types available, and its various uses, demonstrating its importance across different industries.
- [Classification and Working Principle of Glass Plate Level Gauge](https://www.hsahglass.com/news/classification-working-principle-glass-plate/): The glass plate liquid level gauge is an instrument that directly displays the liquid level. It is widely used for liquid level observation in storage tanks and other vessels during industrial production.
- [7 Best Practice Glass Plate Level Gauge Maintenance](https://www.hsahglass.com/news/7-best-practice-glass-plate-level-gauge-maintenance/): The glass plate level gauge is designed to display liquid levels in towers, tanks, spherical vessels, and boilers. This series of level gauges features strong sealing performance and effective leakage prevention.
- [What difference between glass tube level gauge and glass plate level gauge](https://www.hsahglass.com/news/what-difference-between-glass-tube/): The glass tube liquid level gauge can take different forms based on how it's used. If the requirements are not high, it can be simple and self-made. The liquid level in the precision container can use a thicker glass tube. This helps reduce the capillary effect. A more precise cursor scale makes reading easier.
- [What are the Precautions for Level Gauge?](https://www.hsahglass.com/news/what-precautions-level-gauge/): Correct selection of a level gauge is critical to ensuring reliable performance and long service life.
- [Introduction and installation precautions of magnetic flap level gauge](https://www.hsahglass.com/news/introduction-and-installation-precautions-of-magnetic-flap-level-gauge/): The magnetic flap level gauge is a key instrument for liquid level measurement. It uses a two-color magnetic flip column combined with a magnetic float controller to visually indicate liquid level.
- [The principle structure and characteristics of the magnetic flap level gauge](https://www.hsahglass.com/news/the-principle-structure-flap-level-gauge/): The magnetic flap level gauge consists of three main components: a float (main duct), a magnetic float, and a magnetic flap column (magnetic flap indicator). It is also equipped with an indicator, a drain valve, and a connecting flange.
- [What is the Production Method of Optical Glass](https://www.hsahglass.com/news/what-is-the-production-method-of-optical-glass/): As a fused silica glass supplier, I share it with you. Optical glass refers to glass materials that redirect light and modify the spectrum of ultraviolet (UV), visible, or infrared (IR) light.
- [How does Reflex Level Gauge Work?](https://www.hsahglass.com/news/how-does-reflex-level-gauge-work-2/): As a Level Gauges Supplier, I share with you. Reflex Level Gauges are usually used for liquid level detection in specific containers. The main idea is the difference in refractive index between vapor and liquid.
- [Which Level Gauge is the Best](https://www.hsahglass.com/news/which-level-gauge-is-the-best/): The reflection type Liquid Level Gauge uses light refraction to work. It uses the different refractive indices of light in liquids and vapors. The pressure gauge has a vertical cavity filled with fluid from a storage tank. The liquid level in the chamber is the same as in the tank. This level is set by the interface line between the liquid and vapor in the chamber. The chamber installs the prism chamber or prism glass window. When light goes through the prism and there's liquid behind it, the light enters the gauge. It does this without reflecting back to the observer. Thus, the area of the gauge appears dark or black. When light hits the area behind the lens with water vapor (above the liquid), it reflects back to the observer. This makes it look silver or white. The big difference in light transmission and reflection clearly shows the liquid level. You can add a dial to the meter if needed. It can also serve as a simple indicator of liquid level.
- [What is the Measurement Principle of Sight Glass Type Level Gauge?](https://www.hsahglass.com/news/what-is-the-measurement-principle-of-sight-glass-type-level-gauge/): As a sight glass tube supplier, I share this with you.
- [High Pressure Gauge Glass and Acessories for Boiler](https://www.hsahglass.com/news/high-pressure-gauge-glass-and-acessories-for-boiler/): Gauge glass offers everything you need to build, improve, or fix tanks, boilers, and mixed containers. High-pressure gauge glass lets you see readings clearly in high-pressure vessels, such as boilers.
- [What Should you Know About Reflective Level Gauges?](https://www.hsahglass.com/faq/what-should-you-know-about-reflective-level-gauges/): As a Level Gauge Glass Manufacturer, I share with you. There are two types of glass level gauges: reflective and transparent. Reflective liquid level gauges are popular tools for checking liquid levels in containers. The different reflectivities of steam and liquid form the basis of the principle.
- [Why Borosilicate Glass Is Suitable For Sight Glasses And Gauge Glass](https://www.hsahglass.com/faq/why-borosilicate-glass-is-suitable-for-sight-glasses-and-gauge-glass-2/): Borosilicate glass mainly refers to toughened (tempered) borosilicate glass. It is a type of glass whose main components are SiO₂ and B₂O₃. It can handle high temperatures. It also resists thermal shock and fights off chemical attacks with great success.
- [The Troubleshooting of Transparent Level Gauge?](https://www.hsahglass.com/installation-maintenance-replacement/the-troubleshooting-of-transparent-level-gauge/): As a level gauge glass manufacturer, I would like to share this with you.
- [How Many Coating Methods are Available on the Surface of Optical Glass?](https://www.hsahglass.com/faq/how-many-coating-methods-are-available-on-the-surface-of-optical-glass/): As a glass lab manufacturer, I share this with you.
- [How to Clean and Dry Quartz Glass Instruments?](https://www.hsahglass.com/faq/how-to-clean-and-dry-quartz-glass-instruments/): As a fused quartz glass supplier, I share this with you.
- [How To Replace A Steam Boiler Sight Glass](https://www.hsahglass.com/faq/how-to-replace-a-steam-boiler-sight-glass/): Despite its small size, a boiler’s sight glass has great importance. In this post, we’ll show you how to replace a faulty sight glass. This will help keep your boilers running smoothly and your workplace safe.
- [Why Borosilicate Glass Is Suitable For Sight Glasses And Gauge Glass](https://www.hsahglass.com/faq/why-borosilicate-glass-is-suitable-for-sight-glasses-and-gauge-glass/): Borosilicate glass primarily refers to toughened (tempered) borosilicate glass. It is a type of glass whose main components are SiO2 and B2O2. It can handle high temperatures. It also resists thermal shock well and stands up to chemical attacks.
- [The Advantage And Application Of PTFE Gasket O-rings](https://www.hsahglass.com/news/the-advantage-and-application-of-ptfe-gasket-o-rings/): Polytetrafluoroethylene, or PTFE, is a synthetic polymer. It replaces all hydrogen atoms in polyethylene with fluorine. This makes PTFE resistant to acids, alkali, and many organic solvents. It is nearly insoluble in all solvents. PTFE can handle high temperatures and has a very low friction coefficient. Its key benefits include:
- [How To Install And Maintain A Glass Plate Type Level Gauge?](https://www.hsahglass.com/installation-maintenance-replacement/how-to-install-and-maintain-a-glass-plate-type-level-gauge/): A glass plate (flat) level gauge is a common visual level indicator. It is available in two main glass types: reflex gauge glass and transparent (plain/flat) gauge glass. Correct installation and regular maintenance are essential to protect the glass and ensure safe, reliable operation.
- [What is the Difference Between Mica Sheet and Mica Board?](https://www.hsahglass.com/news/what-is-the-difference-between-mica-sheet-and-mica-board/): As a Mica Gaskets manufacturer, I share this with you.
- [Types and advantages of gauge glass](https://www.hsahglass.com/news/types-and-advantages-of-gauge-glass/): Gauge glass is common in the petrochemical and power industries. It must have high temperature and pressure resistance, along with corrosion resistance. A clear sign is also essential. Gauge glass comes in two main types: reflex gauge glass and transparent gauge glass.
- [How To Choose These Four Level Gauge Glass Gaskets](https://www.hsahglass.com/installation-maintenance-replacement/how-to-choose-these-four-level-gauge-glass-gaskets/): Gasket for glass is mainly used to isolate the glass and liquid of the level gauge. Level gauge glass gaskets mainly include the following:
- [The difference between quartz glass and ordinary glass](https://www.hsahglass.com/news/the-difference-between-quartz-glass-and-ordinary-glass/): As society grows and technology improves, more types of glass are available. Users want better performance. Quartz glass, or fused silica, is a high-quality material designed for modern industrial and scientific needs. Quartz glass stands out from regular commercial glasses. It combines unique thermal, optical, chemical, and electrical properties. Knowing these differences helps engineers and buyers pick the right materials.
- [How to choose the right sight glass](https://www.hsahglass.com/faq/how-to-choose-the-right-sight-glass/): Different work conditions must specific materials and types of sight glasses in the industry. When choosing a sight glass, first think about your working environment. Check if the conditions might limit each other. Specifically, you can refer to the following conditions:
- [Advantages and uses of quartz glass](https://www.hsahglass.com/news/advantages-and-uses-of-quartz-glass/): Quartz glass is a kind of glass widely used in people's lives and industry. Experts divide quartz glass into natural quartz glass and synthetic quartz glass. The main component is SiO2. Manufacturers create quartz glass using pure natural crystal, quartz stone, or synthetic materials. It uses electric, gas, and chemical methods for synthesis.
- [This article takes you to understand the glass fluid level gauge](https://www.hsahglass.com/news/this-article-takes-you-to-understand-the-glass-fluid-level-gauge/): The glass fluid level gauge is a kind of liquid level gauge with a simple structure and a long history. It's an instrument based on a glass tube level gauge. It’s more resistant to high temperatures and high pressure.
- [Why fused silica is suitable as an important component for optical glass applications？](https://www.hsahglass.com/news/why-fused-silica-is-suitable-as-an-important-component-for-optical-glass-applications/): Quartz, especially fused silica, is popular in optical applications. Its unique properties make it a top choice. But do you know why fused silica works well as a key part of optical glass use? Some excellent properties of fused silica determine its importance.
- [Aohong level gauge graphite gasket](https://www.hsahglass.com/news/aohong-level-gauge-graphite-gasket/): For many gaskets, they can only withstand a certain temperature and cannot be used for high temperature applications. For example, nitrile gaskets can be used up to 95°C, and silicone and PTFE can be used up to 200°C and 260°C, respectively. Therefore, for high temperature applications, graphite gaskets are a good choice.
- [Advantages and disadvantages of tempered sight glasses](https://www.hsahglass.com/news/advantages-and-disadvantages-of-tempered-sight-glasses/): Tempered sight glasses, or tempered windows, are essential in various industrial and lab settings. They allow for visual inspection of internal processes. These specialized glasses go through a tempering process. This makes them stronger, more durable, and better at resisting thermal shock. So, they are great for high-pressure and high-temperature settings. But, like any technology, tempered sight glasses have both advantages and disadvantages. This article explores these aspects to provide a comprehensive understanding of this technology.
- [The difference between quartz glass and borosilicate glass](https://www.hsahglass.com/news/the-difference-between-quartz-glass-and-borosilicate-glass/): Quartz glass and borosilicate glass are two different types of glass. They have unique properties and uses. Knowing the differences helps you pick the right material for industrial or scientific use.
- [The three simplest steps to use a reflective level gauge](https://www.hsahglass.com/news/the-three-simplest-steps-to-use-a-reflective-level-gauge/): A reflex level gauge measures liquid levels at set intervals. It measures the liquid level by checking how light reflects off the surface. This method provides high precision and stability. Here are the three simplest steps for using a reflective liquid level gauge:
- [What is Gauge Glass Used For](https://www.hsahglass.com/news/what-is-gauge-glass-used-for/): A gauge glass, also known as a reflex gauge or sight glass, is vital in many industries. It is especially important for systems that handle fluids. Its main job is to show how much liquid is in a tank, vessel, or piping system. This effective tool is key for monitoring and ensuring safety and efficiency.
- [Gauge Glass: A Comprehensive Guide](https://www.hsahglass.com/resources/gauge-glass-a-comprehensive-guide/): A gauge glass, or glass liquid level indicator, is essential in many industries. It helps you see the liquid levels in tanks, pipes, and other closed systems. Its main job is to give operators a clear look at fluid levels. This helps them make quick adjustments and avoid overflows or dry runs. Gauge glass is important in the oil and gas industry, chemical processing, and power generation. It helps ensure smooth operation and safety in these industrial processes.
- [Why Gauge Glass Is Far More Than “Just a Window”](https://www.hsahglass.com/news/why-gauge-glass-is-far-more-than-just-a-window/): When I joined Aohong's pressure vessel division in 2016, I made a common mistake. I thought gauge glasses were just simple viewing ports. A midnight emergency call changed everything. A 0.2 mm thickness variation led to a major failure at a petrochemical plant. After nine years and 1,847 stress tests, I can say that gauge glasses are some of the most precisely made safety parts in industrial systems.
- [A Materials Scientist’s Love Letter to Borosilicate Gauge Glass](https://www.hsahglass.com/news/love-letter-to-borosilicate-gauge-glass/): Most engineers think of gauge glass as simple "see-through metal." They're wrong. Discover how Aohong's BoroShield™ formulation redefines material science.
- [The Science Behind Reflex Gauge Glass](https://www.hsahglass.com/news/the-science-behind-reflex-gauge-glass/): At Aohong Laboratories, we’ve spent ten years improving this century-old technology with advanced materials. Discover why reflex gauge glass remains indispensable in industrial safety.
- [Tube-Style Liquid Level Sight Glass Installation](https://www.hsahglass.com/installation-maintenance-replacement/tube-style-liquid-level-sight-glass-installation/): (Includes: tube-style liquid level sight glass installation, tube-style liquid level sight glass maintenance)
- [Troubleshooting Cloudy or Fogged Sight Glasses](https://www.hsahglass.com/news/troubleshooting-cloudy-or-fogged-sight-glasses/): (Keyword reiterated: troubleshooting cloudy or fogged sight glasses.)
- [Reflex Gauge Glass With Gasket Working Principle](https://www.hsahglass.com/news/reflex-gauge-glass-with-gasket-working-principle/): A reflex gauge glass with gasket is the primary sensing element of a reflex level gauge. It consists of a borosilicate prism glass element assembled with a sealing gasket. The device uses the principle of communicating vessels and optical reflection. Liquid and vapor create clear optical interfaces on the prism face. Liquid areas look dark, while vapor areas appear bright (silver-white). This design allows for clear level readings. The gasket sits between the glass and the metal groove. It stops leaks and resists corrosive materials and high pressures. Knowing how the reflex gauge glass works is key. Choosing the right glass and gasket ensures accurate measurements and a longer lifespan.
- [Difference Between Borosilicate Gauge Glass and Aluminium Silicon Glass](https://www.hsahglass.com/faq/difference-between-borosilicate-gauge-glass-and-aluminium-silicon-glass/): Borosilicate gauge glass and aluminosilicate glass (aluminum silicon) are two kinds of gauge glass. Various applications use them. Both types have unique perks. Borosilicate glass has great thermal resistance. Aluminosilicate glass excels in hardness and scratch resistance.
- [What are the advantages of our high quality gauge glass products?](https://www.hsahglass.com/faq/what-are-the-advantages-of-our-high-quality-gauge-glass-products/): Gauge glass products are key parts in many industries. They show liquid levels in tanks, boilers, and pressure vessels. They play a crucial role in ensuring safe and efficient operations. Below are the key advantages of using gauge glass products:
- [What is the density of gauge glass](https://www.hsahglass.com/news/what-is-the-density-of-gauge-glass/): A “gauge glass” (or sight glass) isn’t made from just one material. Manufacturers pick from borosilicate, soda-lime (float) glass, or fused silica/quartz. Their choice depends on the application. Each material has a different density. When asking suppliers for weight, shipping, or structural calculations, specify the glass type.
- [How does Reflex Level Gauge Work](https://www.hsahglass.com/news/how-does-reflex-level-gauge-work/): As a Level Gauges Supplier, I share this with you. The Reflex Level Gauge measures how the refractive index differs between vapor and liquid. It also measures liquid levels, and various processes can use it.

## Pages
- [Oil Level Gauge Glass for Reservoirs Solution](https://www.hsahglass.com/solutions/oil-level-gauge-glass-for-reservoirs-solution/): Oil level gauge glass for reservoirs is used to monitor oil level clearly, safely, and continuously in storage tanks and industrial reservoirs. For buyers, the main concerns are usually readability, oil resistance, sealing reliability, durability, and compatibility with the working condition.
- [Boiler Reflex Gauge Glass](https://www.hsahglass.com/solutions/boiler-reflex-gauge-glass/): Boiler reflex gauge glass is a reliable level indicator solution designed for steam boilers, water level monitoring, and high-temperature industrial systems. In boiler service, the key buyer concerns are not only visibility, but also pressure resistance, temperature resistance, safety, and long service life.
- [Transparent Gauge Glass with Mica Shield for Chemicals](https://www.hsahglass.com/solutions/transparent-gauge-glass-for-chemicals/): Transparent gauge glass with mica shield for chemicals is designed for chemical process equipment that needs clear level visibility, stronger surface protection, and longer service life. In chemical service, the glass itself is not the only concern. Buyers must also consider corrosion resistance, thermal shock, sealing reliability, and protection against aggressive media.
- [Transparent Gauge Glass for Dark Liquids](https://www.hsahglass.com/solutions/transparent-gauge-glass-for-dark-liquids/): Transparent gauge glass for dark liquids is designed to give clear and reliable level visibility where the liquid itself is hard to inspect. In many industrial systems, dark liquids create low contrast, weak reflections, and poor readability. The right sight glass helps buyers solve a practical problem: how to see liquid level clearly and safely under real working conditions.
- [Gauge Glass for Clear Liquids](https://www.hsahglass.com/solutions/gauge-glass-for-clear-liquids/): We supply gauge glass for clear liquids in different materials, sizes, and shapes for industrial buyers worldwide. Our products can be customized according to:
- [Custom Sight Glass](https://www.hsahglass.com/custom-sight-glass/): We manufacture custom sight glass components based on customer drawings, samples, or standard references. Options may include circular sight glass discs, discs with a central hole, stepped edge discs, wiper-hole discs, tubular sight glass, and special shapes for non-standard assemblies. Sight glass suppliers commonly offer borosilicate, soda lime, and quartz options depending on the service condition.
- [Process](https://www.hsahglass.com/services/process/): In our level gauge glass production process, we follow the following steps
- [Inquiry](https://www.hsahglass.com/inquiry/): Products Inquiry Home *Subject: *Your Name: *Phone: *E-mail: WhatsApp: Please leave this field empty. *Content:
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- [Get Instant Quote](https://www.hsahglass.com/request-quote/): Please leave this field empty.
- [Contact Us](https://www.hsahglass.com/contact-us/): Gauge glass and level gauge manufacturers and suppliers
- [Sight Glass Solutions](https://www.hsahglass.com/solutions/): We are a manufacturer of sight glass, providing high-quality sight glass solutions to customers worldwide across a wide range of industries.
- [Home](https://www.hsahglass.com/): Aohong sight glass
- [Factory & Capacity](https://www.hsahglass.com/factory-capacity/): Behind every high-performance sight glass is a fully integrated, ISO-managed manufacturing facility. Take a look inside Hengshui Aohong Technology — your direct factory source for reflex level gauge glass, circular sight glass, and tubular sight glass.
- [About Us](https://www.hsahglass.com/about-us/): Aohong Special Glass Manufacturing Co., LTD. Founded in 2002, this company is a top producer of liquid level gauge glass. They focus on reflex glass and transparent glass as their main priorities. We focus on excellence and follow German DIN7081 and DIN7080 standards. This commitment has built our trusted brand. We are also dedicated to innovation. The company is ISO 9001:2015 certified. It has advanced production equipment and a strong R&D team. We can offer top-notch glass products that meet strict global industry standards.
- [Privacy Policy](https://www.hsahglass.com/privacy-policy/): Hengshui Aohong Technology Co., Ltd. (“we,” “us,” or “our”) is committed to protecting the privacy of visitors and users (“you” or “your”) of our website, https://www.hsahglass.com/ (the “Site”). As a professional sight glass manufacturer specializing in borosilicate sight glass, quartz sight glass, and other industrial observation glasses, we value the trust you place in us when you share your personal information.

## Products
- [DIN 7081 Gauge Glass](https://www.hsahglass.com/level-gauge-glasses/din-standard-gauge-glass/din-7081-gauge-glass/): DIN 7081 Gauge Glass is a rectangular industrial sight glass used in liquid level gauge assemblies for visual level indication in pressure vessels, boilers, and process tanks. Manufactured in accordance with DIN 7081 dimensional standard, the glass is typically produced from borosilicate material with controlled optical flatness and surface finish to ensure stable sealing performance and clear visibility under industrial operating conditions. Standard: DIN 7081 Material: Borosilicate glass (industrial grade) Application: Level gauge systems / pressure vessels / process equipment Function: Direct visual liquid level indication Suitable for OEM gauge assemblies. Dimensions and thickness can be supplied according to standard specification or customer drawing.
- [Borosilicate Tubular Gauge Glass](https://www.hsahglass.com/tubular-sight-glasses/borosilicate-tubular-gauge-glass/): Borosilicate tubular gauge glass is used for direct visual liquid-level indication in tanks, reservoirs, boilers, and process vessels.It is a clear, high-strength glass tube designed for gauge assemblies where visibility, chemical resistance, and thermal shock resistance matter.
- [Heavy Wall Tubular Gauge Glass](https://www.hsahglass.com/tubular-sight-glasses/heavy-wall-tubular-gauge-glass/): Heavy wall tubular gauge glass is a high-pressure glass tube used for direct liquid-level indication in industrial gauge assemblies.It is commonly described as the highest pressure-rated type within the tubular glass family, with extra resistance to heat shock and strong optical clarity.
- [Redline Tubular Gauge Glass](https://www.hsahglass.com/tubular-sight-glasses/redline-tubular-gauge-glass/): Redline tubular gauge glass is a borosilicate level indicator tube designed to make liquid levels easier to read.Its red stripe between two white lines improves visibility, especially when the liquid is colorless, and the redline variant is widely used in tanks, reservoirs, and low-pressure boilers.
- [Transparent Tubular Gauge Glass](https://www.hsahglass.com/tubular-sight-glasses/transparent-tubular-gauge-glass/): Transparent tubular gauge glass is used to provide direct visual verification of liquid level in industrial tanks and vessels.It is commonly supplied as a clear borosilicate tube with tight dimensional tolerances, high optical quality, and pressure ratings that depend on the complete gauge design.
- [DIN 7080 Sight Glass](https://www.hsahglass.com/round-sight-glasses/din-7080-sight-glass/): DIN 7080 sight glass is a round borosilicate sight glass plate used for visual inspection in industrial process equipment.Published DIN 7080 datasheets describe it as special tempered, ground and polished, with pressure-duty service up to 280°C and no lower temperature limit stated.
- [Soda-Lime Round Sight Glass](https://www.hsahglass.com/round-sight-glasses/soda-lime-round-sight-glass/): Soda-lime round sight glass is a circular sight glass disc used for visual inspection in process vessels and pipeline systems.For DIN 8902-type products, the published operating limit is up to 150°C, with no lower temperature limit stated in the datasheets.
- [Tempered Borosilicate Sight Glass Disc](https://www.hsahglass.com/round-sight-glasses/tempered-borosilicate-sight-glass-disc/): Tempered borosilicate sight glass disc is a circular glass window used in industrial sight glass assemblies for visual inspection of process media.This DIN 7080-type borosilicate disc is described as tempered, ground and polished, and suitable for pressure duties at temperatures up to 280°C, with no lower temperature limit stated in the referenced datasheet.
- [Stepped Sight Glass](https://www.hsahglass.com/round-sight-glasses/stepped-sight-glass/): A stepped sight glass is a circular glass window with a stepped edge profile designed to fit securely into sight glass assemblies.For borosilicate versions, published DIN 7080 data shows pressure-duty operation up to 280°C with no lower temperature limit stated in the source datasheet.
- [Round Sight Glass with Wiper](https://www.hsahglass.com/round-sight-glasses/round-sight-glass-with-wiper/): Round sight glass with wiper is a circular glass disc designed for sight glass assemblies that use a manual wiper to keep the viewing area clear.The commonly documented version uses a 10.5 mm central bore hole and is suitable for industrial visual inspection in process equipment, tanks, and vessels.
- [Round Sight Glass with Central Hole](https://www.hsahglass.com/round-sight-glasses/round-sight-glass-with-central-hole/): Round sight glass with central hole is a circular glass disc used in industrial sight glass assemblies where a wiper needs to pass through the center.This version is typically specified with a central bore hole of Ø10.5 mm and is used for visual observation in process equipment under thermal and chemical stress.
- [Round Sight Glass Disc](https://www.hsahglass.com/round-sight-glasses/round-sight-glass-disc/): Round sight glass disc is a circular glass component used in sight glass assemblies to visually monitor liquid level, flow, and process conditions.This DIN 7080-type borosilicate version is ground and polished, and is suitable for pressure duties at temperatures up to 280°C, with no lower temperature limit stated in the source data.
- [Borosilicate Tubular Sight Glass](https://www.hsahglass.com/tubular-sight-glasses/borosilicate-tubular-sight-glass/): Product: Durable borosilicate tubular sight glass for level gauges. Typical sizes: Ø10–Ø30 mm, wall thickness 1.5–4.0 mm (custom sizes available). MOQ: 5 pcs. Lead time: 10–14 days (subject to order qty and customization). Datasheet & samples: Free datasheet; sample policy available on request. Quality / Testing: ISO 9001 certified.
- [Borosilicate Round Glass](https://www.hsahglass.com/round-sight-glasses/borosilicate-round-glass/): Product: Durable borosilicate round sight glass discs for level gauges. Typical sizes: Ø50–Ø200 mm, thickness 5 / 8 / 10 / 12 / 15 / 19 mm (custom diameters & thicknesses available). Datasheet & samples: Free datasheet; sample policy available on request. Quality: ISO 9001 certified. MOQ: 5 pcs. Lead time: 10–14 days (subject to order quantity and customization).
- [Transparent Flat Gauge Glass](https://www.hsahglass.com/level-gauge-glasses/transparent-flat-gauge-glass/): Product: Durable transparent flat gauge glass for level gauges and sight windows. Typical sizes: thickness 5 / 8 / 10 / 12 / 15 mm; width 30–400 mm; length 100–1200 mm (custom sizes and cut-to-drawing available). Datasheet & samples: Free datasheet; sample policy available on request. Quality: ISO 9001 certified. MOQ: 5 pcs. Lead time: 10–14 days (subject to order qty and customization).
- [Liquid Level Sight Glass](https://www.hsahglass.com/level-gauge-glasses/liquid-level-sight-glass/): Product: Durable liquid level sight glass for tube-style gauges, round sight ports and flat plate windows. Tubular: Ø10–Ø30 mm.     Round discs: Ø50–Ø200 mm.     Flat panels: thickness 5 / 8 / 10 / 12 / 15 mm. Quality: ISO 9001 certified. MOQ: 5 pcs (varies by spec for custom sizes). Lead time: 10–14 days (subject to order qty & customization).
- [Borosilicate Sight Glass](https://www.hsahglass.com/level-gauge-glasses/borosilicate-sight-glass/): Product: Durable borosilicate sight glass for tube-style level gauges, round sight ports, and flat gauge windows. Tubular: Ø10–Ø30 mm.   Round discs: Ø50–Ø200 mm.   Flat panels: thickness 5 / 8 / 10 / 12 / 15 mm. Datasheet & samples: Free datasheet; sample policy available on request. Quality: ISO 9001 certified. MOQ: 5 pcs (varies for some custom specs). Lead time: 10–14 days (subject to order qty & customization).
- [Reflex Gauge Glass For Boiler](https://www.hsahglass.com/level-gauge-glasses/reflex-gauge-glass-for-boiler/): Product: Durable borosilicate reflex gauge glass with prismatic grooves for clear liquid/steam contrast in boiler applications. Typical sizes: thickness 17 - 30 mm; width 30 / 34 mm; standard lengths 115 - 500 mm (custom sizes available). Datasheet & samples: Free datasheet; sample policy available on request. Quality: ISO 9001 certified; pressure & thermal-shock tested for boiler service. MOQ: 5 pcs. Lead time: 10–14 days (subject to order qty & customization).
- [Aluminum Silicon Rectangular Sight Glass](https://www.hsahglass.com/round-sight-glasses/aluminum-silicon-rectangular-sight-glass/): Product: Durable aluminum silicon (aluminosilicate) rectangular sight glass for plate-type sight windows and level gauges. Typical sizes: thickness 12 - 30 mm; width 30–400 mm; length 140–500 mm. Datasheet & samples: Free datasheet; sample policy available on request. Quality: ISO 9001 certified. MOQ: 5 pcs. Lead time: 10–14 days (subject to order qty & customization).
- [Aluminum Silicon Round Glass](https://www.hsahglass.com/round-sight-glasses/aluminum-silicon-round-glass/): Product: Durable aluminum silicon round glass for level gauges and inspection ports. Typical sizes: Ø50–Ø200 mm, thickness 8 - 22 mm (custom diameters & thicknesses available). Datasheet & samples: Free datasheet; sample policy available on request. Quality: ISO 9001 certified. MOQ: 5 pcs. Lead time: 10–14 days (subject to order qty & customization).
- [Aluminum Silicon Transparent Gauge Glass](https://www.hsahglass.com/level-gauge-glasses/aluminum-silicon-transparent-gauge-glass/): Product: Durable aluminum silicon (aluminosilicate) transparent gauge glass for plate-type level gauges and sight windows. Typical sizes: thickness 12 - 30 mm; width 30–400 mm; length 140–500 mm. Datasheet & samples: Free datasheet; sample policy available on request. Quality: ISO 9001 certified. MOQ: 5 pcs. Lead time: 10–14 days (subject to order qty & customization).
- [Aluminum Silicon Reflex Gauge Glass](https://www.hsahglass.com/level-gauge-glasses/aluminum-silicon-reflex-gauge-glass/): Product: Durable aluminosilicate (aluminum silicon) reflex gauge glass for reflex/prismatic level gauges. Suitable for medium–high temperature and pressure service. Typical sizes: thickness 17 - 30 mm; width 30 / 34 mm; standard lengths 115 - 500 mm. Datasheet & samples: Free technical datasheet; sample policy available on request. Quality: ISO 9001 certified. MOQ: 5 pcs. Lead time: 10–14 days (subject to order quantity & customization).
- [Quartz Glass Tube](https://www.hsahglass.com/tubular-sight-glasses/quartz-glass-tube/): Product: Precision fused quartz glass tube for tubular level gauges and sight columns; excellent thermal stability and optical clarity. Typical sizes: Ø10–Ø30 mm, wall thickness 1.5–4.0 mm (custom OD, wall and lengths available). Material performance: Fused quartz (SiO₂ ≥ 99.9%), continuous use up to 1100 °C, exceptional thermal shock resistance. Datasheet & samples: Free technical datasheet; sample policy available on request. Quality: ISO 9001 certified. MOQ: 5 pcs. Lead time: 10–14 days (subject to order qty & customization).
- [Quartz Round Glass](https://www.hsahglass.com/round-sight-glasses/quartz-round-glass/): Product: High-purity fused quartz round sight glass for sight ports, indicators, and optical windows.Material: Fused quartz — excellent thermal stability and optical clarity.Typical sizes: Ø10–Ø100 mm, thickness 1.0–6.0 mm (custom sizes available).Datasheet & samples: Free datasheet; sample policy available on request.Quality: ISO 9001 certified.MOQ: 5 pcs.Lead time: 10–14 days (subject to order quantity and customization).
- [Quartz Rectangular Glass](https://www.hsahglass.com/round-sight-glasses/quartz-rectangular-glass/): High-purity Quartz Rectangular Glass designed for various industrial sight glasses. Made from fused quartz, it has great thermal, optical, and chemical stability. This makes it ideal for high-temperature and high-pressure uses. Available in standard and custom sizes for OEM and replacement use.
- [Graphite Gasket](https://www.hsahglass.com/accessories/graphite-gasket/): High-performance graphite gasket for isolating glass and liquid in level gauges. Provides excellent resistance to high temperatures, pressure, and chemicals, ensuring reliable sealing and accurate readings.
- [Mica Gasket](https://www.hsahglass.com/accessories/mica-gasket/): High-quality mica gasket for isolating glass and liquid in level gauges, providing excellent insulation and preventing leaks.
- [Non-Asbestos Gaskets](https://www.hsahglass.com/accessories/non-asbestos-gaskets/): Low, mid, high pressured asbestos gasket,oil resistant non-asbestos gaskets.

## Site Builder
- [DIN JIS Standard Gauge Glass1](https://www.hsahglass.com/astra-advanced-hook/din-jis-standard-gauge-glass1/): Confirm whether your equipment uses DIN or JIS specification.
- [DIN JIS Standard Gauge Glass](https://www.hsahglass.com/astra-advanced-hook/din-jis-standard-gauge-glass/): DIN / JIS Standard Gauge Glass DIN & JIS Standard Gauge Glass Plates for Industrial Level Gauges DIN and JIS standard gauge glass plates are precision-manufactured sight glass strips designed to match standardized level gauge assemblies. They are widely used for replacement and OEM applications in tanks, vessels, boilers, and process systems where dimensional compatibility and standard compliance are critical. Download Full Catalogue Request Quote Contact Technical Team DIN 7081 gauge glass JIS gauge glass plate standard sight glass plate level gauge glass replacement industrial gauge glass plate boiler gauge glass standard borosilicate gauge glass DIN Standard Gauge Glass Matching Gauge Body Standard Glass Plate Visual Inspection Overview Specification Guide Selection Guide Standards & HS Code FAQ Catalogue Request Quote Overview Standardized Gauge Glass for Reliable Replacement and OEM Use DIN and JIS standard gauge glass plates are manufactured according to established industrial standards to ensure interchangeability and consistent performance. These sight glass plates are commonly used in level gauge assemblies where precise dimensions and compatibility with existing equipment are required. DIN Standard Gauge Glass DIN standard gauge glass, typically referenced under DIN 7081, is widely used in European and international markets. It defines key dimensions such as width, thickness, and length tolerances for level gauge glass plates. This standard ensures consistent fit and simplifies replacement in industrial systems. Learn more → JIS Standard Gauge Glass JIS standard gauge glass is commonly used in Japan and Asia-Pacific markets. It follows Japanese Industrial Standards for glass dimensions and performance requirements. Buyers often specify JIS glass when matching equipment manufactured for regional markets. Learn more → Replacement and Maintenance Use Standard gauge glass plates are frequently ordered as replacement parts. Maintenance teams rely on DIN or JIS specifications to ensure the new glass matches the existing gauge body without modification. This reduces downtime and simplifies procurement. Learn more → Download Catalogue Request Quote
- [Transparent Gauge Glass1](https://www.hsahglass.com/astra-advanced-hook/transparent-gauge-glass1/): Specification Guide Transparent Gauge Glass Specification at a Glance Use this table to compare the key technical parameters before sending a quotation request. Exact limits depend on the complete gauge design, mounting arrangement, and service condition. Parameter Typical Value Notes Material Borosilicate glass in accordance with DIN 7081 Standard material for transparent strip glass in industrial level gauge service. Glass size Width 34 mm, thickness 17 mm Common strip-glass dimensions used in DIN 7081 level gauge plates. Viewing principle Direct view of the liquid column or meniscus Transparent design allows through-view observation of the process fluid. Steam service Up to 243 °C without mica design For steam service, higher temperature use requires appropriate design selection. Steam service with mica design Up to 300 °C Mica design is used for specific applications where extra protection is required. Other media Up to 300 °C, special cases up to 374 °C Temperature and pressure must be considered together in the final selection. Operating pressure Vacuum to 250 bar Final limit depends on the complete glass level gauge design. Applications Tanks, vessels, chemical industry, petrochemical industry, power plants Used where continuous level indication is needed without auxiliary power. Selection Guide How to Choose the Right Transparent Gauge Glass The correct choice depends on the medium, temperature, pressure, gauge body size, and whether the application is standard liquid service or steam service. Use the guide below to narrow the specification before requesting a quotation. 1 Confirm the service fluid Identify whether the medium is water, steam, oil, chemical liquid, or another process fluid. Steam service and aqueous boiler service usually need a more careful material and temperature check. 2 Check the temperature range For steam, the glass can be used up to 243 °C without mica design and up to 300 °C with mica design. For other media, up to 300 °C is possible and special cases can go higher. 3 Match the gauge body Confirm the strip width, thickness, visible length, and mounting arrangement so the glass fits the gauge body correctly. Standard strip dimensions are 34 mm by 17 mm. 4 Decide whether mica design is needed If the application involves steam, high temperature, or boiler water with treatment chemicals, mica design can help protect the glass in specific service conditions. 5 Send the quotation data Provide the drawing, length, quantity, pressure, temperature, and service medium. This helps match the correct transparent gauge glass quickly and accurately. Need help choosing between transparent gauge glass and reflex gauge glass? Transparent gauge glass is usually best when direct viewing of the liquid or meniscus is needed. Reflex gauge glass is usually better when the liquid and gas zones need a strong contrast for faster reading. Contact Technical Team Standards, Certification, and HS Code Industry Standards and Common HS Code Buyers often ask about standards, inspection documents, and tariff classification before placing an order. This section gives a practical procurement summary for transparent gauge glass. DIN 7081 DIN 7081 is the standard reference for borosilicate sight glass plates used in transparent and reflex level gauge applications. It is the most common technical basis for transparent gauge glass sourcing. Steam Service Note For steam, the glass can be used up to 243 °C without mica design and up to 300 °C with mica design. For boiler water with additives, the final design must be selected carefully. Pressure and Temperature The operating pressure can reach vacuum to 250 bar in suitable glass level gauge designs, but the final limit always depends on the complete system and the selected materials. Documents Typical buyer-requested documents include inspection reports, dimensional reports, material certificates, and certificate of conformity. These help support industrial procurement and quality review. Common HS Code A common classification reference for transparent gauge glass parts is HS 7020, “Other articles of glass.” Final tariff classification may vary by country and by the exact construction of the item, so confirm with your customs broker or local import authority before shipment. FAQ Frequently Asked Questions About Transparent Gauge Glass What is transparent gauge glass used for? Transparent gauge glass is used for direct visual level reading in tanks, vessels, boilers, and process equipment. What is the difference between transparent gauge glass and reflex gauge glass? Transparent gauge glass allows direct through-view observation of the liquid or meniscus, while reflex gauge glass uses reflection to show a dark liquid column and a silvery gas column. What is the standard size of transparent gauge glass? The common strip-glass dimensions are 34 mm width and 17 mm thickness. What is the maximum temperature for steam service? For steam, transparent gauge glass can be used up to 243 °C, and with mica design up to 300 °C. What is the maximum pressure? Operating pressure can reach vacuum to 250 bar depending on the complete gauge design and service condition. What information do you need for a quote? Please send the product type, visible length, width, thickness, material, working temperature, working pressure, medium, quantity, and a drawing or sample if available. Can transparent gauge glass be used in boiler systems? Yes, but boiler service must be evaluated carefully because high temperature and water treatment chemicals can increase erosion risk. What is the HS code for transparent gauge glass? A common classification reference is HS 7020, but the final code depends on the exact product structure and your destination country. Download Full Transparent Gauge Glass Catalogue Get the complete product overview, size reference, material options, and application guidance in one file. Download Catalogue Request Quote Request a Quote Send your drawing, visible length, width, thickness, pressure, temperature, medium, and quantity. We will review the requirement and reply with a technical quotation. Transparent gauge glass plate DIN 7081 strip glass Clear level gauge glass Mica design transparent glass Custom replacement transparent glass Contact Technical Team Need help matching the correct transparent gauge glass for a tank, vessel, boiler, or replacement project? Contact the technical team for fast product matching. Contact Technical Team
- [Transparent Gauge Glass](https://www.hsahglass.com/astra-advanced-hook/transparent-gauge-glass/): Transparent Gauge Glass Transparent Gauge Glass for Direct Liquid Level Reading and Process Observation Transparent gauge glass is the long strip glass used in level gauge assemblies to provide a clear view of the liquid level, meniscus, and process condition. It is commonly selected for tanks, vessels, boilers, and process equipment where direct viewing, standard strip dimensions, and reliable service limits are required. Download Full Catalogue Request Quote Contact Technical Team transparent sight glass plate clear level gauge glass DIN 7081 transparent glass mica design transparent glass steam level gauge glass industrial level gauge glass custom transparent gauge glass How Transparent Gauge Glass Works Vessel / Tank Transparent Glass Plate Inspection / Reading Overview Specification Guide Selection Guide Standards & HS Code FAQ Catalogue Request Quote Transparent Gauge Glass Overview Transparent Gauge Glass for Direct Meniscus Reading and Process Observation Transparent gauge glass is a standard strip-glass solution for industrial level gauge service when the operator needs to view the liquid column directly through the glass. It is commonly used in gauge bodies where visibility, repeatability, and replacement compatibility matter. The product family is usually specified by strip width, thickness, visible length, pressure duty, and whether mica design is needed for steam service. Direct Liquid Level Reading Transparent gauge glass is used when the operator needs to read the liquid level or meniscus directly. It provides a clear visual window into the equipment and is widely used in tanks, vessels, and process systems that require accurate manual reading. Because the glass is transparent rather than reflective, it is especially useful when the user wants to inspect the liquid condition itself rather than only a contrast line. This makes it one of the most universal strip-glass formats for industrial level gauges. Learn more → Steam and Hot Service Transparent gauge glass is also used in steam-related applications where temperature selection is important. In steam service, a mica design can be used to help protect the glass in higher-temperature conditions and to improve service life in aqueous boiler environments. This makes transparent gauge glass a practical option for boilers, hot-water systems, and other process equipment where the operating conditions must be carefully matched to the glass and the overall gauge design. Learn more → Replacement and OEM Use Transparent gauge glass is often purchased as a replacement item or as part of an OEM gauge assembly. Buyers usually specify the strip length, width, thickness, pressure range, and mounting detail so the new plate fits the existing body correctly. It is a common sourcing item for maintenance teams, plant shutdown work, and equipment builders who need standard dimensions and reliable visual performance. For this reason, it remains one of the most requested forms of industrial level gauge glass. Learn more → Download Full Transparent Gauge Glass Catalogue Request Quote
- [Reflex Gauge Glass1](https://www.hsahglass.com/astra-advanced-hook/reflex-gauge-glass1/): Specification Guide Reflex Gauge Glass Specification at a Glance Use this table to compare the most important technical parameters before sending a quotation request. Exact limits depend on the complete gauge design, mounting arrangement, and service condition. Parameter Typical Value Notes Material Borosilicate glass in accordance with DIN 7081 Standard material for reflex strip glass in industrial level gauge service. Glass size Width 34 mm, thickness 17 mm Standard strip-glass dimensions used in DIN 7081 level gauge plates. Viewing principle Dark liquid column / light gas column Reflex grooves refract light differently across the liquid and gas zones. Steam service Up to 243 °C without mica design For steam service, higher temperature use requires appropriate design selection. Steam service with mica design Up to 300 °C Mica design is used for specific applications where extra protection is required. Other media Up to 300 °C, special cases up to 374 °C Temperature and pressure must be considered together in the final selection. Operating pressure Vacuum to 250 bar Final limit depends on the complete glass level gauge design. Applications Tanks, vessels, chemical industry, petrochemical industry, power plants Used where continuous level indication is needed without auxiliary power. Selection Guide How to Choose the Right Reflex Gauge Glass The correct choice depends on the medium, temperature, pressure, gauge body size, and whether the application is standard liquid service or steam service. Use the guide below to narrow the specification before requesting a quotation. 1 Confirm the service fluid Identify whether the medium is water, steam, oil, chemical liquid, or another process fluid. Steam service and aqueous boiler service usually need a more careful material and temperature check. 2 Check the temperature range For steam, the glass can be used up to 243 °C without mica design and up to 300 °C with mica design. For other media, up to 300 °C is possible and special cases can go higher. 3 Match the gauge body Confirm the strip width, thickness, visible length, and mounting arrangement so the glass fits the gauge body correctly. Standard strip dimensions are 34 mm by 17 mm. 4 Decide whether mica design is needed If the application involves steam, high temperature, or boiler water with treatment chemicals, mica design can help protect the glass in specific service conditions. 5 Send the quotation data Provide the drawing, length, quantity, pressure, temperature, and service medium. This helps the supplier match the correct reflex gauge glass quickly and accurately. Need help choosing between reflex gauge glass and transparent gauge glass? Reflex gauge glass is usually best when the liquid and gas zones need a strong contrast for fast reading. Transparent gauge glass is usually better when direct viewing of the meniscus is required. Contact Technical Team Standards, Certification, and HS Code Industry Standards and Common HS Code Buyers often ask about standards, inspection documents, and tariff classification before placing an order. This section gives a practical procurement summary for reflex gauge glass. DIN 7081 DIN 7081 is the standard reference for borosilicate sight glass plates used in reflex and transparent level gauge applications. It is the most common technical basis for reflex gauge glass sourcing. Steam Service Note For steam, the glass can be used up to 243 °C without mica design and up to 300 °C with mica design. For boiler water with additives, the final design must be selected carefully. Pressure and Temperature The operating pressure can reach vacuum to 250 bar in suitable glass level gauge designs, but the final limit always depends on the complete system and the selected materials. Documents Typical buyer-requested documents include inspection reports, dimensional reports, material certificates, and certificate of conformity. These help support industrial procurement and quality review. Common HS Code A common classification reference for reflex gauge glass parts is HS 7020, “Other articles of glass.” Final tariff classification may vary by country and by the exact construction of the item, so confirm with your customs broker or local import authority before shipment. FAQ Frequently Asked Questions About Reflex Gauge Glass What is reflex gauge glass used for? Reflex gauge glass is used for continuous visual level indication in tanks, vessels, boilers, and process equipment. How does reflex gauge glass work? The reflective grooves make the liquid column appear dark and the gas column appear silvery, which makes the level easy to read. What is the standard size of reflex gauge glass? The common strip-glass dimensions are 34 mm width and 17 mm thickness. What is the maximum temperature for steam service? For steam, reflex gauge glass can be used up to 243 °C, and with mica design up to 300 °C. What is the maximum pressure? Operating pressure can reach vacuum to 250 bar depending on the complete gauge design and service condition. What information do you need for a quote? Please send the product type, visible length, width, thickness, material, working temperature, working pressure, medium, quantity, and a drawing or sample if available. Can reflex gauge glass be used in boiler systems? Yes, but boiler service must be evaluated carefully because high temperature and water treatment chemicals can increase erosion risk. What is the HS code for reflex gauge glass? A common classification reference is HS 7020, but the final code depends on the exact product structure and your destination country. Download Full Reflex Gauge Glass Catalogue Get the complete product overview, size reference, material options, and application guidance in one file. Download Catalogue Request Quote Request a Quote Send your drawing, visible length, width, thickness, pressure, temperature, medium, and quantity. We will review the requirement and reply with a technical quotation. Reflex gauge glass plate DIN 7081 strip glass Reflex level indicator glass Mica design reflex glass Custom replacement reflex glass Contact Technical Team Need help matching the correct reflex gauge glass for a tank, vessel, boiler, or replacement project? Contact the technical team for fast product matching. Contact Technical Team
- [Reflex Gauge Glass](https://www.hsahglass.com/astra-advanced-hook/reflex-gauge-glass/): Reflex Gauge Glass Reflex Gauge Glass for Industrial Level Indication and Steam Service Reflex gauge glass is a long strip glass used in level gauge assemblies to show liquid level as a dark column and gas or steam as a silvery column. It is commonly selected for industrial vessels, boilers, tanks, and process equipment where fast visual reading, standard strip dimensions, and reliable service limits are important. Download Full Catalogue Request Quote Contact Technical Team reflex sight glass plate DIN 7081 reflex glass reflex gauge glass plate steam level gauge glass mica design sight glass industrial level gauge glass reflex level indicator glass How Reflex Gauge Glass Works Vessel / Tank Reflex Glass Plate Inspection / Reading Overview Specification Guide Selection Guide Standards & HS Code FAQ Catalogue Request Quote Reflex Gauge Glass Overview Reflex Gauge Glass for Fast Visual Level Reading Reflex gauge glass is one of the most recognizable strip-glass types used in level gauge assemblies. The reflective groove design creates a dark liquid column and a light or silvery gas column, which makes level reading fast and intuitive in industrial service. The standard material family is borosilicate glass in accordance with DIN 7081, and common sight glass plate dimensions are 34 mm width and 17 mm thickness. Industrial Level Indication Reflex gauge glass is used where operators need continuous level indication without auxiliary power. It is a strong fit for tanks, vessels, process equipment, and level gauge bodies where the liquid column must be visible directly through the glass. The strip format supports repeated reading, straightforward maintenance, and a standardized replacement process. It is a practical choice for buyers who want a reliable mechanical level display rather than an electronic instrument. Learn more → Steam and Boiler Service Reflex gauge glass is also used in steam-related service where the temperature and pressure conditions must be considered together. In boiler systems with aqueous media, unprotected sight glass can be affected by high temperature and water treatment chemicals, so the operating limits and material choice matter. Where the application requires a higher thermal margin, mica design may be used in the system design to protect the glass in specific service conditions. Learn more → Replacement and OEM Use Reflex gauge glass is often purchased as a replacement item or as part of an OEM gauge assembly. Buyers typically specify the strip length, width, thickness, pressure range, and mounting detail so the replacement matches the gauge body correctly. This makes reflex glass a common sourcing item for maintenance teams, plant shutdown work, and equipment builders who need repeatable fit and standard dimensions. Learn more → Download Full Reflex Gauge Glass Catalogue Request Quote
- [Tubular Sight Glass1](https://www.hsahglass.com/astra-advanced-hook/tubular-sight-glass1/): Specification Guide Tubular Sight Glass Specification at a Glance Use this table to compare the most common tubular sight glass requirements before requesting a quotation. Exact pressure capability depends on the variant, diameter, end finish, and length selected for the assembly. :contentReference{index=9} Variant Typical OD End Finish Pressure Range Typical Use Key Benefit Transparent Tubular Gauge Glass 1/2" OD to 1 1/2" OD Cut / ground / fire polished 90 to 600 psi depending on the build Tanks, reservoirs, boilers, flowmeters Direct liquid-level reading Redline Tubular Gauge Glass Commonly available in 5/8" and 3/4" OD forms Fire polished in many versions Depends on tube form and length Low-contrast liquid-level reading Better visibility from a distance High Pressure Tubular Gauge Glass 1/2" OD to 1 1/2" OD Cut / ground / fire polished Up to the upper end of the family range More demanding level-gauge service Stronger pressure selection Heavy Wall Tubular Gauge Glass 5/8" OD to 3/4" OD Ground ends 90 to 600 psi depending on end finish, diameter, and length Higher-pressure level gauge assemblies Highest pressure rating in the family Heavy Wall Red Line Tubular Gauge Glass Heavy-wall size range Ground ends / application dependent Heavy-wall service range Demanding service with visibility needs Combines readability and strength Selection Guide How to Choose the Right Tubular Sight Glass The correct choice depends on the fluid, visibility requirement, pressure, and the gauge body dimensions. Heavy wall glass is the strongest tubular option, red line glass improves visibility, and standard transparent tubes are the common general-purpose choice. :contentReference{index=10} 1 Confirm the service condition Identify whether the application is for a tank, reservoir, boiler, or flowmeter. The service condition decides whether you need a standard clear tube, a red line tube, or a heavier wall construction. 2 Choose the visibility style Use transparent tubular gauge glass for direct reading, and redline tubular gauge glass when the liquid is clear or difficult to read. If strength matters more, move to heavy wall construction. 3 Check the dimensions Confirm the outside diameter, wall thickness, and length. Standard tubular gauge glass is commonly offered from 1/2" OD to 1 1/2" OD, and heavy wall forms are often 5/8" or 3/4" OD. :contentReference{index=11} 4 Match the end finish End finish affects fit and pressure capability. Common options are cut, ground, and fire polished, and the final choice depends on the gauge design and the operating condition. :contentReference{index=12} 5 Request a drawing-based quote For custom or replacement work, send a drawing or sample together with the working pressure, fluid, and length. This is the fastest way to match the correct tubular sight glass type. Need help choosing between redline tubular gauge glass and heavy wall tubular gauge glass? Redline improves visibility. Heavy wall improves pressure margin and heat-shock resistance. If both are needed, use the heavy wall red line version. Contact Technical Team Standards, Certification, and HS Code Industry Standards and Common HS Code Buyers often ask about standard references, inspection documents, and tariff classification before placing an order. This section gives a practical procurement summary for tubular sight glass. :contentReference{index=13} Standard Product Family The tubular gauge glass family is commonly offered as Standard, Red Line, High Pressure, Heavy Wall, and Heavy Wall Red Line. These product forms cover a wide range of industrial and commercial service conditions. :contentReference{index=14} Typical Documentation Typical buyer-requested documents include inspection reports, dimensional reports, material certificates, and certificate of conformity. These documents help confirm that the tube matches the drawing and service condition. Heavy Wall Note Heavy wall glass is described as the highest pressure-rated tubular glass and is extra resistant to heat shock. It is often selected when the application requires added mechanical margin. :contentReference{index=15} Red Line Note Red line tubular gauge glass is commonly used in tanks, reservoirs, and low-pressure boiler applications because the red stripe makes liquid level easier to read from a distance. :contentReference{index=16} Common HS Code A common classification reference for tubular sight glass parts is HS 7020, “Other articles of glass.” Final tariff classification may vary by country and by the exact construction of the item, so confirm with your customs broker or local import authority before shipment. :contentReference{index=17} FAQ Frequently Asked Questions About Tubular Sight Glass What is tubular sight glass used for? Tubular sight glass is used for direct liquid-level indication in tanks, reservoirs, boilers, flowmeters, and other level gauge assemblies. :contentReference{index=18} What is the difference between transparent and redline tubular gauge glass? Transparent tubular gauge glass is used for direct reading, while redline tubular gauge glass adds a red stripe that makes the liquid level easier to read from a distance. :contentReference{index=19} What is the strongest tubular sight glass type? Heavy wall glass is described as the highest pressure-rated tubular glass and is extra resistant to heat shock. :contentReference{index=20} What sizes are available? Common published tubular gauge glass sizes run from 1/2" OD to 1 1/2" OD, while heavy wall forms are commonly 5/8" and 3/4" OD. :contentReference{index=21} What pressure range is available? Published tubular gauge glass data shows pressure ratings from 90 to 600 psi depending on the product form, end finish, diameter, and length required. :contentReference{index=22} What end finishes are available? Common end finishes include cut, ground, and fire polished, depending on the application and the gauge design. :contentReference{index=23} What information do you need for a quote? Please send the product type, outside diameter, length, end finish, working pressure, working temperature, medium, quantity, and a drawing or sample if available. What is the HS code for tubular sight glass? A common classification reference is HS 7020, but the final code depends on the exact product structure and your destination country. :contentReference{index=24} Download Full Tubular Sight Glass Catalogue Get the complete product overview, size reference, material options, and application guidance in one file. Download Catalogue Request Quote Request a Quote Send your drawing, size, end finish, pressure, temperature, and quantity. We will review the requirement and reply with a technical quotation. Transparent tubular gauge glass Redline tubular gauge glass High pressure tubular gauge glass Heavy wall tubular gauge glass Custom cut length tubular sight glass Contact Technical Team Need help matching the correct tubular sight glass for a tank, reservoir, boiler, flowmeter, or replacement project? Contact the technical team for fast product matching. Contact Technical Team
- [Tubular Sight Glass](https://www.hsahglass.com/astra-advanced-hook/tubular-sight-glass/): Tubular Sight Glass Tubular Sight Glass for Direct Liquid Level Indication in Tanks, Reservoirs, Boilers, and Flowmeters Tubular sight glass is the clear glass tube used in level gauge assemblies to show liquid level directly and continuously. It is a practical solution for industrial level monitoring when the user needs a readable liquid column, a stable installation, and a tube that can be matched to pressure, length, end finish, and service condition. The family is commonly available in multiple variants and a wide size range. :contentReference{index=1} Download Full Catalogue Request Quote Contact Technical Team transparent tubular gauge glass clear gauge glass tube redline tubular gauge glass heavy wall tubular gauge glass high pressure gauge glass replacement tubular gauge glass custom cut length gauge glass Typical Tubular Sight Glass Use Tank / Reservoir Tubular Sight Glass Inspection / Reading Configurations Specification Guide Selection Guide Standards & HS Code FAQ Catalogue Request Quote Tubular Sight Glass Forms Common Tubular Sight Glass Forms for Industrial Level Gauge Service Buyers usually choose tubular sight glass by visibility style, pressure requirement, and tube construction. The family is commonly supplied in standard, red line, high pressure, heavy wall, and heavy wall red line forms. Typical published size ranges run from 1/2" OD to 1 1/2" OD, with end finishes of cut, ground, or fire polished. Pressure ratings can range from 90 to 600 psi depending on the tube form and the full specification. :contentReference{index=2} Transparent Tubular Gauge Glass Transparent tubular gauge glass is the standard clear tube used for direct liquid-level reading in external level gauge assemblies. It is selected when the operator needs a straightforward visual column rather than a marked or contrast-enhanced tube. This form is widely used in tanks, reservoirs, boilers, and flowmeters, and it is often the first choice for general industrial service. Buyers commonly search for transparent tubular gauge glass, clear gauge glass tube, and tubular gage glass when they want a clear, readable level-indication component. :contentReference{index=3} Learn more → Redline Tubular Gauge Glass Redline tubular gauge glass is used when the level needs to be easier to read from a distance or when the liquid is clear and low-contrast. The red stripe improves visibility and makes the level easier to identify in tanks, reservoirs, and low-pressure boiler applications. This form is commonly searched as red line gauge glass, redline gauge glass tube, and redline tubular gauge glass. It is a practical choice for operators who want better visual distinction without changing the basic tubular gauge arrangement. :contentReference{index=4} Learn more → High Pressure Tubular Gauge Glass High pressure tubular gauge glass is used when the level gauge needs to withstand a more demanding pressure condition than a standard tube. It belongs to the same family of tubular gauge glasses that are offered with different end finishes and diameter options, and it is a common fit for industrial systems that need a stronger tube selection while keeping the same basic visual-reading method. Buyers often use search terms such as high pressure gauge glass, high pressure tubular gauge glass, and clear high pressure gauge glass. :contentReference{index=5} Learn more → Heavy Wall Tubular Gauge Glass Heavy wall tubular gauge glass is the strongest tubular glass option in the family and is chosen when pressure margin and heat-shock resistance are more important than cost. This type is described as the highest pressure-rated tubular glass, with very clear optical performance and extra resistance to heat shock. It is commonly available in 5/8" and 3/4" OD versions, with ground ends, and is often searched as heavy wall gauge glass or heavy wall gage glass. :contentReference{index=6} Learn more → Heavy Wall Red Line Tubular Gauge Glass Heavy wall red line tubular gauge glass combines the visibility advantage of the red stripe with the stronger construction of a heavy wall tube. It is useful when an operator wants a readable liquid column and a stronger tube form in the same assembly. This type is frequently selected for demanding service where readability, pressure margin, and durability all matter at the same time. It is a common search phrase for replacement work and custom industrial gauge assemblies. :contentReference{index=7} Learn more → Custom Cut Length Tubular Sight Glass Custom cut length tubular sight glass is used when the standard stock length does not match the customer’s gauge body or installation drawing. Buyers often need a special length, end finish, or diameter match, especially in replacement work for old equipment or OEM assemblies. Standard product literature allows different lengths, diameters, and end finishes to be combined into the final specification, which makes custom cut lengths a practical sourcing option for many industrial projects. :contentReference{index=8} Learn more → Download Full Tubular Sight Glass Catalogue Request Quote
- [Round Sight Glasses1](https://www.hsahglass.com/astra-advanced-hook/round-sight-glasses1/): Material Comparison Round Sight Glass Materials Comparison Use this table to compare temperature resistance, pressure behavior, chemical resistance, common applications, and practical pros and limitations before choosing a circular sight glass material. Material Typical Temperature Pressure Behavior Chemical Resistance Common Applications Pros Limitations Borosilicate glass 3.3 Up to 280°C for DIN 7080-type circular sight glass discs Pressure depends on disc size, thickness, and assembly design High chemical resistance Round sight glass disc, circular sight glass disc, sight glass disc with central hole High thermal resistance, clear visibility, strong industrial durability Higher cost than soda lime glass Soda lime glass Up to 150°C for DIN 8902-type circular sight glass discs Pressure depends on diameter and thickness Suitable for low thermal and chemical loads Replacement sight glass disc, general observation window Economical, standard round formats, easy to source Lower temperature margin Tempered borosilicate High thermal service with improved strength Used in pressure duties depending on the full assembly Good chemical durability Industrial sight window, process vessel, custom round sight glass Better strength, better thermal shock resistance Must still match the installation and operating limits Quartz glass Used for very high temperature observation windows Depends on the complete assembly Excellent resistance in severe service High-temperature process windows Very high temperature capability, very high purity Usually higher cost and not needed for standard circular sight glass service Selection Guide How to Choose the Right Round Sight Glass The correct choice depends on the media, temperature, pressure, installation method, and whether the part must be a simple disc, a central-hole disc, or a stepped-edge design. Use the guide below to narrow the product family before requesting a quotation. 1 Confirm the application Identify whether the part is used in a tank, vessel, process line, observation port, or level gauge assembly. The application decides whether you need a basic disc, a wiper-hole disc, or a stepped edge. 2 Choose the viewing style Use a standard round sight glass disc for a simple window, a central-hole disc when a bore is required, and a stepped sight glass when seating geometry is important. 3 Select the material Borosilicate is the common choice for higher temperature and stronger chemical resistance. Soda lime is usually chosen for lower thermal-load and cost-sensitive projects. 4 Check size and thickness Confirm outer diameter, thickness, viewing diameter, hole size, and edge finish. These dimensions must match the housing or the replacement drawing. 5 Match temperature and pressure Tell us the working temperature, pressure, and medium so we can recommend the correct circular sight glass material and geometry for the duty. Need help choosing between borosilicate round sight glass and soda lime round sight glass? Borosilicate is usually the better choice for higher temperature and chemical resistance. Soda lime is usually the better choice for lower temperature and economical replacement work. Contact Technical Team Standards, Certification, and HS Code Industry Standards and Common HS Code Buyers often ask about standards, inspection documents, and tariff classification before placing an order. This section gives a practical procurement summary for round sight glasses. DIN 7080 The common reference standard for borosilicate circular sight glass discs. This family is used for pressure duties and is widely specified for industrial sight glass assemblies. DIN 8902 The common reference standard for soda lime circular sight glass discs. It is typically used for lower thermal-load service and standard round replacement needs. Central Hole and Wiper-Hole Versions Circular discs with a central hole are used where a wiper or special pass-through is required. Standard wiper-hole versions commonly use a 10.5 mm bore for compatible cleaning assemblies. Inspection Documents Typical buyer-requested documents include inspection reports, dimensional reports, material certificates, and certificate of conformity. Quality documentation is commonly supplied with industrial glass orders. Common HS Code A common classification reference for round sight glass parts is HS 7020, “Other articles of glass.” Final tariff classification may vary by country and by the exact construction of the item, so confirm with your customs broker or local import authority before shipment. FAQ Frequently Asked Questions About Round Sight Glasses What is a round sight glass used for? A round sight glass is used to provide a circular visual window into tanks, vessels, process equipment, or level gauge assemblies. What is the difference between round sight glass disc and circular sight glass disc? They refer to the same product family. The difference is mainly wording, with both terms commonly used by industrial buyers. What is the difference between borosilicate and soda lime round sight glass? Borosilicate is usually chosen for higher temperature and stronger chemical resistance, while soda lime is usually chosen for lower thermal-load and cost-sensitive service. What is a sight glass disc with central hole? It is a circular sight glass disc with a bore through the center, usually used for a wiper or special mounting requirement. What is a wiper hole sight glass? A wiper hole sight glass is a circular disc designed with a central hole so that a cleaning wiper can pass through and help keep the viewing area clear. What is the maximum temperature for borosilicate round sight glass? DIN 7080-type borosilicate round sight glass is commonly used up to 280°C. What is the maximum temperature for soda lime round sight glass? DIN 8902-type soda lime round sight glass is commonly used up to 150°C. What information do you need for a quote? Please send the product type, shape, size, thickness, material, working temperature, working pressure, medium, quantity, and a drawing or sample if available. Download Full Round Sight Glass Catalogue Get the complete product overview, size reference, material options, and application guidance in one file. Download Catalogue Request Quote Request a Quote Send your drawing, size, material, temperature, pressure, and quantity. We will review the requirement and reply with a technical quotation. Round sight glass disc Circular sight glass disc Sight glass disc with central hole Wiper hole sight glass Stepped sight glass Custom round sight glass Contact Technical Team Need help matching the correct circular sight glass for a tank, vessel, process window, or replacement project? Contact the technical team for fast product matching. Contact Technical Team
- [Round Sight Glasses](https://www.hsahglass.com/astra-advanced-hook/round-sight-glasses/): Round Sight Glasses Round Sight Glasses for Industrial Observation, Replacement, and Custom Applications Round sight glasses are circular glass components used in industrial sight glass assemblies to provide direct visual inspection of liquid level, flow, or process condition. They are commonly selected for tanks, vessels, process equipment, and custom installations where a circular glass window must match a specific housing, pressure condition, or cleaning requirement. Download Full Catalogue Request Quote Contact Technical Team round sight glass disc circular sight glass disc sight glass disc with central hole wiper hole sight glass stepped sight glass replacement sight glass disc custom round sight glass Typical Round Sight Glass Use Tank / Vessel Round Sight Glass Inspection / Reading Configurations Material Comparison Selection Guide Standards & HS Code FAQ Catalogue Request Quote Round Sight Glass Configurations Common Round Sight Glass Forms for Industrial Use Round sight glasses are used in a wide range of industrial assemblies, from standard circular sight windows to discs with a central hole, wiper-hole versions, and stepped-edge designs. The descriptions below reflect the main product forms buyers search for when they need a circular glass part for inspection, replacement, or custom fabrication. Round Sight Glass Disc A round sight glass disc is the most common circular glass form used in industrial sight glass assemblies. Buyers search for round sight glass disc, circular sight glass disc, and round glass disc for sight glass when they need a direct replacement or a new assembly component. This form is used in pressure-rated windows, tank observation points, and process equipment that needs a compact circular viewing area. It is often specified by diameter, thickness, edge finish, material, and standard reference. Because it is the core circular format, it is the starting point for many custom and OEM requirements. Learn more → Circular Sight Glass Disc Circular sight glass disc is a common industrial search phrase used by buyers who want the same product family as round sight glass disc, but with a more technical wording. It is especially common in replacement projects and drawing-based sourcing. This type is used where the sight glass must provide a clear circular window into the equipment while matching an existing clamp, flange, or housing design. Typical buyer concerns include outer diameter, viewing diameter, temperature class, and whether the disc is ground, polished, or tempered. It is a straightforward, widely used format for visual inspection in industrial service. Learn more → Round Sight Glass with Central Hole Round sight glass with central hole is used when the glass must allow a central bore through the disc, usually for special mounting or cleaning requirements. This product is frequently searched as sight glass disc with central hole, circular sight glass with central bore hole, and wiper hole sight glass. It is a practical solution for assemblies that require a mechanical pass-through or a cleaning accessory in the center. Because the hole size affects the fitting and function, buyers usually select this product by drawing, sample, or exact installation requirement. It is common in custom circular sight glass systems. Learn more → Sight Glass Disc with Wiper Hole Sight glass disc with wiper hole is designed for applications where manual cleaning of the inner glass surface is needed. The central hole allows the wiper assembly to pass through the disc and help keep the viewing area clear during operation. Buyers commonly search for sight glass disc with wiper hole, round sight glass with wiper, and circular sight glass with central hole. This configuration is useful where deposits, haze, or process residue can reduce visibility over time. It is often used in industrial process equipment that needs a clearer viewing area and a more maintainable inspection window. Learn more → Stepped Sight Glass A stepped sight glass has a stepped edge profile that helps the glass seat securely in the housing and improves fit in the sight glass assembly. Buyers search for stepped sight glass, stepped sight glass disc, and round stepped sight glass when they need a specific edge geometry rather than a flat circular plate. This form is widely used in industrial equipment where proper seating and repeatable installation are more important than a general-purpose disc. It is a common choice for replacement work, OEM parts, and custom engineered assemblies where the edge design is tied directly to the body design. Learn more → Custom Round Sight Glass Custom round sight glass is used when standard diameters, thicknesses, holes, or edge styles do not match the installation. It is common in OEM equipment, replacement projects, and technical drawings where the customer needs a part manufactured to exact dimensions. Typical custom requests include special thickness, non-standard diameter, center hole, stepped edge, polished edge, and surface treatment. Buyers searching for custom round sight glass or custom circular sight glass usually want a supplier that can make the part from a drawing or sample and support the quotation process with technical review. This is the most flexible option in the round sight glass category. Learn more → Download Full Level Gauge Glass Catalogue Request Quote
- [Level Gauge Glasses1](https://www.hsahglass.com/astra-advanced-hook/level-gauge-glasses1/): Material Comparison Level Gauge Glass Materials Comparison Use this table to compare temperature resistance, pressure behavior, chemical resistance, common applications, and practical pros and cons before choosing a long strip glass type. Type Typical Temperature Pressure / Service Behavior Chemical Resistance Common Applications Pros Limitations Reflex Gauge Glass Standard industrial level-gauge service; steam service typically up to 243°C, with mica design up to 300°C Used in pressure-rated level gauges; complete gauge systems can be specified up to vacuum to 250 bar depending on design Good for many industrial liquids; suitable for clear liquids Clear liquid level indication in tanks, vessels, and process equipment Easy-to-read dark/silvery level contrast, simple visual interpretation Not the best choice when transparent viewing or meniscus reading is preferred Transparent Gauge Glass Steam service typically up to 243°C without mica design; with mica design up to 300°C Used in pressure-rated glass level gauges; system pressure depends on body design and connection type Good chemical durability in borosilicate versions General level indication, steam service, hot water, process liquids Direct meniscus reading, versatile, suitable with mica design Needs proper lighting and correct installation for best readability DIN Standard Gauge Glass DIN 7081 strip glass is used in standard long-strip gauge assemblies Designed for standard replacement and known gauge-body matching Depends on material choice; borosilicate is the common option Standard replacement gauges, OEM assemblies, industrial maintenance Standard dimensions, easy to source, repeatable fit Must match the gauge body dimensions exactly Boiler Gauge Glass Steam service up to 243°C; with mica design up to 300°C; for other media, temperatures to 300°C are possible and special cases to 374°C Boiler systems may require higher safety margins, and unprotected glass in aqueous boiler service can erode faster under high pH and additives Improved protection when mica design is used Boilers, steam lines, hot-water level gauges, heat-transfer systems Better suited to hot and demanding service, higher safety focus Requires careful material selection and correct mica configuration Selection Guide How to Choose the Right Level Gauge Glass The correct choice depends on the media, temperature, pressure, and whether the application is a standard liquid level gauge or a boiler steam service. Use the guide below to narrow the product family before sending a quotation request. 1 Identify the service condition Confirm whether the medium is water, steam, a chemical liquid, or another process fluid. Boiler service and high-temperature steam usually need transparent gauge glass with mica design rather than a basic strip glass. 2 Choose reflex or transparent viewing Use reflex gauge glass when you want a strong dark-versus-silvery level contrast for clear liquids. Use transparent gauge glass when you need direct meniscus reading or through-view observation. 3 Check standard dimensions For DIN standard gauge glass, confirm the strip width, thickness, and standard length. DIN 7081 glass plates are commonly referenced with a width of 34 mm and thickness of 17 mm. 4 Match the assembly Confirm the gauge body, gasket faces, segment length, and center-to-center distance. A correct fit is essential for sealing, visibility, and service life. 5 Specify the operating limits Tell us the working temperature, pressure, media type, and whether mica design, heating, or insulation is required. This helps identify the proper strip glass and the matching gauge structure. Need help choosing between reflex gauge glass and transparent gauge glass? Reflex gauge glass is usually better for quick clear-liquid level reading. Transparent gauge glass is usually better when you need a direct view of the liquid or steam-water interface. Contact Technical Team Standards, Certification, and HS Code Industry Standards and Common HS Code Buyers often ask about standards, inspection documents, and tariff classification before placing an order. This section gives a practical procurement summary for long strip gauge glass. DIN 7081 The core standard for reflex and transparent strip glasses used in level gauge assemblies. DIN 7081 glasses are commonly specified as borosilicate plates for industrial level indication. Reflex and Transparent Service Reflex glasses work on reflection and refraction to show a dark liquid column and a silvery gas column. Transparent glasses allow direct viewing of the meniscus or the liquid itself. Boiler / Steam Service For boiler systems with aqueous media, mica design is used to help protect the glass at elevated temperature. This is especially important where high pH and water-treatment additives increase erosion risk. Certificates and Documents Typical buyer-requested documents include inspection reports, dimensional reports, material certificates, and certificate of conformity. Quality documentation is commonly supplied with industrial glass orders. Common HS Code A common classification reference for level gauge glass is HS 7020, “Other articles of glass.” Final tariff classification may vary by country and by the exact construction of the item, so confirm with your customs broker or local import authority before shipment. FAQ Frequently Asked Questions About Level Gauge Glass What is level gauge glass used for? Level gauge glass is used to visually monitor liquid level in tanks, vessels, boilers, and process equipment. What is the difference between reflex gauge glass and transparent gauge glass? Reflex gauge glass uses a reflective groove pattern to show a dark liquid column and a silvery gas column, while transparent gauge glass allows direct viewing of the meniscus or the liquid itself. What does DIN standard gauge glass mean? DIN standard gauge glass usually refers to strip glass plates made to DIN 7081 dimensions for standard level gauge assemblies. What is the maximum temperature for boiler gauge glass? For steam service, transparent or reflex glass can be used to 243°C, and with mica design to 300°C. For other media, temperatures to 300°C are possible, and special cases can reach 374°C. What information do you need for a quote? Please send the product type, shape, size, thickness, material, working temperature, working pressure, medium, quantity, and a drawing or sample if available. Can you make custom level gauge glass according to drawing? Yes. Custom level gauge glass can be produced according to drawing, sample, or technical specification, including special length, width, thickness, and edge requirements. How do I install a strip gauge glass correctly? Confirm the gauge body, gasket position, plate orientation, and pressure direction. The glass must match the housing and installation instructions must be followed carefully. What is the HS code for level gauge glass? A common classification reference is HS 7020, but the final code depends on the exact product structure and your destination country. Download Full Level Gauge Glass Catalogue Get the complete product overview, size reference, material options, and application guidance in one file. Download Catalogue Request Quote Request a Quote Send your drawing, size, material, temperature, pressure, and quantity. We will review the requirement and reply with a technical quotation. Reflex gauge glass Transparent gauge glass DIN standard gauge glass Boiler gauge glass Custom level gauge glass Contact Technical Team Need help choosing the correct long strip glass for steam, water, chemical liquid, or standard process service? Contact the technical team for fast product matching. Contact Technical Team
- [Level Gauge Glasses](https://www.hsahglass.com/astra-advanced-hook/level-gauge-glasses/): Level Gauge Glass Level Gauge Glass for Reflex, Transparent, DIN Standard, and Boiler Service Level gauge glass is the long strip glass used in industrial level gauges to display liquid level clearly and safely. Choose the right gauge glass type to match the working temperature, pressure, media, and installation style of your vessel, boiler, or process equipment. Download Full Catalogue Request Quote Contact Technical Team Typical Level Gauge Glass Use Vessel / Boiler Level Gauge Glass Reading / Inspection Types Overview Material Comparison Selection Guide Standards & HS Code FAQ Catalogue Request Quote Level Gauge Glass Types Overview Choose the Right Long Strip Glass Type for Your Application The main buyer decision is usually based on how the liquid level must be read, how hot the service is, and whether the medium is steam, water, chemical liquid, or a general process fluid. The four categories below cover the most common long strip glass options used in industrial level gauges. Reflex Gauge Glass Reflex gauge glass is designed with reflective grooves that change the way light behaves across the glass plate. In use, the liquid phase appears as a dark column while the gas or steam phase appears silvery, which makes the level easy to identify at a glance. This type is widely used for clear liquids and direct reading in industrial level gauges. Buyers often search for reflex sight glass plate, reflex gauge glass plate, and DIN 7081 reflex glass when they need a reliable strip glass for standard gauge assemblies. Learn more → Transparent Gauge Glass Transparent gauge glass is used when the operator needs to see the liquid level directly or read the meniscus from the back side of the gauge. It is commonly chosen for applications that need a more universal visual reading method than reflex glass, especially when the media condition or installation requires a clear-through sight window. Search terms often include transparent gauge glass, transparent sight glass plate, and clear level gauge glass. This type is typically selected for process equipment that requires visibility, straightforward maintenance, and compatibility with mica design when steam service is involved. Learn more → DIN Standard Gauge Glass DIN standard gauge glass refers to the standard long strip glass plate used in DIN 7081 level gauge assemblies. It is the most common reference point for buyers who need standard dimensions, standard installation matching, and predictable replacement. Typical DIN 7081 plate size data includes a width of 34 mm and a thickness of 17 mm, with standard lengths used across multiple gauge sizes. Buyers often search for DIN standard sight glass, DIN 7081 gauge glass, and standard level gauge glass when they want a direct replacement that fits a known gauge body. Learn more → Boiler Gauge Glass Boiler gauge glass is used in steam and hot-water service where the level gauge must handle elevated temperature and demanding operating conditions. For boiler applications, transparent borosilicate glass with mica design is commonly used to reduce chemical attack and improve service life in hot water and steam environments. In boiler service, unprotected glass can suffer erosion when high temperature and water treatment additives are present, so the right material and design choice is critical. Buyers commonly search for boiler gauge glass, boiler sight glass plate, and steam level gauge glass when sourcing this category. Learn more → Download Full Level Gauge Glass Catalogue Request Quote

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