Product Overview
Quartz Round Glass is a precision-machined circular transparent window designed for use in industrial sight glasses and level gauges. Made from fused quartz (SiO₂ ≥ 99.99%), it provides outstanding thermal stability, chemical resistance, and optical clarity in demanding process environments.
This product is also commonly referred to as Quartz Sight Glass, Round Quartz Window, or Fused Quartz Circular Glass, and is widely used as a direct replacement for borosilicate or tempered glass where higher performance is required.
Material & Manufacturing Expertise (E-E-A-T)
With over a decade of experience supplying sight glass components to industrial OEMs and exporters, our quartz round glass is produced exclusively from electrically fused quartz, not pressed or ordinary glass.
Manufacturing Process
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High-purity fused quartz raw material
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CNC precision cutting and shaping
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Double-side fine grinding and optical polishing
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Edge chamfering to reduce stress concentration
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100% visual and dimensional inspection before shipment
This process ensures consistent thickness, flatness, and sealing reliability in critical installations.
Key Performance Advantages
High Temperature Resistance
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Continuous operating temperature: up to 1100 °C
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Short-term exposure: up to 1200 °C
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Extremely low thermal expansion (0.5 × 10⁻⁶ /K)
Excellent Chemical Stability
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Resistant to most acids and solvents
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Not suitable for hydrofluoric acid (HF)
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Ideal for corrosive chemical and pharmaceutical processes
Superior Optical Performance
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Visible light transmittance: >90%
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No yellowing or clouding under long-term heat
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Enables clear and accurate process observation
Typical Applications
Quartz round glass is widely used in:
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Industrial sight glass assemblies
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Transparent level gauges
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Chemical reactors and pipelines
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Boilers and pressure vessels
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Pharmaceutical and fine chemical equipment
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High-temperature process observation ports
It is particularly recommended where borosilicate glass cannot withstand temperature, pressure, or chemical exposure.
Technical Specifications
Material Properties
| Property | Value |
|---|---|
| Material | Fused Quartz (SiO₂ ≥ 99.99%) |
| Density | 2.2 g/cm³ |
| Softening Point | ~1680 °C |
| Continuous Working Temp | ≤1100 °C |
| Thermal Expansion | 0.5 × 10⁻⁶ /K |
| Light Transmittance | >90% (visible spectrum) |
Common Thickness Options
Standard thicknesses for industrial sight glass use:
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5 mm
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8 mm
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10 mm
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12 mm
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15 mm
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20 mm
Thickness selection depends on diameter, working pressure, and installation structure.
Common Diameter Sizes (mm)
Frequently supplied round sizes:
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Ø50
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Ø60
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Ø70
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Ø80
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Ø100
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Ø120
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Ø150
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Ø200
Custom diameters and tolerances are available based on drawings or samples.
Edge & Surface Options
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Chamfered or ground edges
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Optical-grade polished surface (standard)
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Drilled holes (optional)
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Compatible with graphite gaskets, mica gaskets, and PTFE sealing systems
Designed for reliable sealing in metal frames and sight glass housings.
Why Choose Our Quartz Round Glass
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Direct manufacturer, not trading-only supplier
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Stable quality for long-term B2B supply
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OEM & drawing-based customization support
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Export experience to Europe, North America, Middle East, and Southeast Asia
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Engineering support for thickness & pressure selection
We focus on industrial-grade reliability and long service life, not low-cost consumer glass.
Ordering & Technical Support
To ensure correct selection, please provide:
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Working temperature
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Working pressure
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Medium type
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Required diameter & thickness
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Installation method / gasket type
Our technical team will confirm suitability before production.
Contact Us
Email: info@hsahglass.com
WhatsApp: 8618632879676
Website: www.hsahglass.com
For datasheets, samples, or quotations, feel free to contact us.
