Round Sight Glass Disc for Industrial Observation | Circular Sight Glass Disc, DIN 7080 Borosilicate Glass
Product Overview
The round sight glass disc is a replacement or OEM glass part for circular sight glass assemblies. It is widely used where operators need direct visual confirmation of process status in tanks, vessels, pipelines, and other industrial equipment. Common search phrases used by overseas buyers include round sight glass disc, circular sight glass disc, DIN 7080 sight glass disc, borosilicate sight glass disc, and replacement sight glass disc.
For process industries, the main value of a circular sight glass disc is simple: it gives a direct visual window into the system while using a material that is chemically resistant and thermally stable. Borosilicate 3.3 is commonly described as having low thermal expansion, good thermal stability, and strong resistance to water, acids, alkalis, and organic substances.
Typical Applications
The round sight glass disc is used in applications that require visual observation under thermal and chemical stress, including process flow monitoring and container inspection. Supplier technical literature on DIN 7080 safety sight glasses describes this type of glass as suitable for reliable visual inspection and process control in demanding industrial environments.
Typical application scenarios include:
- tank and vessel observation
- liquid level monitoring
- process flow observation
- chemical processing equipment
- sanitary and industrial sight glass assemblies
Material & Manufacturing
This page assumes a toughened borosilicate glass version. The source material identifies borosilicate glass 3.3 with the following key properties: density 2.23 ± 0.02 g/cm³, thermal expansion coefficient 3.3 ± 0.1 × 10⁻⁶/K (0–300°C), softening point 815 ± 10°C, strain point 560 ± 10°C, bending strength 160 N/mm², Young’s modulus 64 GPa, and hardness 5.5 Mohs.
The same source also states that borosilicate glass 3.3 can operate at -196°C to 500°C short time and -196°C to 450°C long time in non-tempered form, while the tempered version is recommended down to -70°C and up to 280°C long time. For DIN 7080 sight glass discs, the product literature specifies pressure duties at temperatures up to 280°C.
Manufacturing features commonly stated for this product type include:
- toughened borosilicate glass
- ground and polished surfaces
- optional coating available
- dimensional options according to standard sizes
- replacement discs for circular sight glass assemblies
Why Buyers Choose This Product
The main buying reasons are clear: chemical resistance, thermal stability, and dependable visibility. Industrial glass literature on DIN 7080 safety sight glasses highlights excellent chemical resistance, high homogeneity, and improved temperature cycling resistance due to thermal prestressing.
Key advantages:
- High thermal stability for process environments with elevated temperature.
- Good chemical durability for water, acids, alkalis, and organic substances.
- Ground and polished finish for fit and optical clarity.
- Standardized sizing for easier replacement and procurement.
- Broad industrial usability in tanks, vessels, and flow monitoring systems.
Technical Data
Material Properties
| Property | Value | Source |
|---|---|---|
| Material | Borosilicate glass 3.3 | |
| Density | 2.23 ± 0.02 g/cm³ | |
| Thermal expansion coefficient (0–300°C) | 3.3 ± 0.1 × 10⁻⁶/K | |
| Softening point | 815 ± 10°C | |
| Strain point | 560 ± 10°C | |
| Bending strength | 160 N/mm² | |
| Young’s modulus | 64 GPa | |
| Hardness | 5.5 Mohs | |
| Temperature range (tempered, long time) | -70°C to 280°C | |
| Temperature limit in DIN 7080 literature | up to 280°C |
Standard Sizes for DIN 7080 Round Sight Glass Disc
| D × s (mm) | Viewing Diameter d1 (mm) | Nominal Pressure (bar) |
|---|---|---|
| 63 × 10 | 48 | 16 |
| 80 × 12 | 65 | 16 |
| 100 × 15 | 80 | 16 |
| 125 × 15 | 100 | 10 |
| 125 × 20 | 100 | 16 |
| 150 × 20 | 125 | 10 |
| 150 × 25 | 125 | 16 |
| 175 × 20 | 150 | 10 |
| 175 × 25 | 150 | 16 |
| 200 × 20 | 175 | 8 |
| 200 × 25 | 175 | 10 |
| 200 × 30 | 175 | 16 |
| 250 × 25 | 225 | 8 |
| 250 × 30 | 225 | 10 |
The datasheet also states that other dimensions are available on request.
Standards and Quality References
The source literature identifies this product family as Circular Sight Glass Disc to DIN 7080 and notes an ISO 9001 QA certificate on the referenced datasheet. It also states that the discs are intended for pressure duties and are supplied as tempered borosilicate or soda lime glass with both sides ground and polished.
For your website, this section should only mention certifications and test reports that you can actually provide, such as:
- ISO 9001 certificate
- incoming inspection report
- dimensional inspection record
- heat resistance test record
- customer approval sample report
Do not list a certificate unless you can show the document on request.
Quality Evidence / Inspection Records
Use this block on the page with your real materials:
Inspection Report Available
Dimensional inspection, visual inspection, and surface finish confirmation can be supplied with each batch.
Customer Case Available
Replace this line with one real customer application, such as a tank sight glass replacement project or OEM assembly supply case.
Test Data Available
Insert your actual temperature test, pressure test, or dimensional tolerance report here.
That keeps the page credible and avoids unsupported claims.
FAQ
What is a round sight glass disc?
A round sight glass disc is the glass insert used in a circular sight glass assembly for visual observation of process media.
Is this the same as a circular sight glass disc?
Yes. In English search behavior, round sight glass disc and circular sight glass disc are both common ways to describe the same product type.
What material is usually used?
For DIN 7080 applications, the standard material shown in the source literature is toughened borosilicate glass.
What is the temperature range?
For the DIN 7080 version in the source literature, the operating limit is stated as up to 280°C under pressure duty.
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