Product Overview
Quartz Rectangular Glass is a high-performance transparent window used in various industrial sight glasses to allow safe and continuous visual monitoring of process media. Manufactured from fused quartz (SiO₂ ≥ 99.99%), it offers exceptional resistance to high temperature, pressure, and aggressive chemicals.
This product is widely known as Quartz Sight Glass, Rectangular Quartz Window, or Fused Quartz Glass Plate, and is commonly used as a replacement or OEM component in level gauges and sight glass assemblies.
Material & Manufacturing Quality
Our quartz rectangular glass is produced from electrically fused quartz, not borosilicate or tempered soda-lime glass.
With over 7+ years of experience supplying sight glass components for industrial OEMs, our production follows strict dimensional and optical inspection standards.
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Raw material: High-purity fused quartz ingot
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Manufacturing: CNC cutting + precision grinding + fine polishing
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Quality control: Thickness tolerance, flatness, visual clarity, edge integrity
This ensures long-term stability in critical process environments.
Key Performance Advantages
High Temperature Resistance
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Continuous working temperature: up to 1100 °C
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Short-term exposure: up to 1200 °C
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Thermal shock resistance far superior to borosilicate glass
Excellent Chemical Resistance
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Resistant to most acids (except hydrofluoric acid)
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Stable in alkaline and organic chemical environments
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Suitable for corrosive process media
Superior Optical Clarity
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High light transmittance (>90% in visible spectrum)
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No discoloration under long-term heat exposure
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Ideal for clear and accurate visual inspection
Typical Applications
Quartz rectangular glass is commonly used in:
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Industrial sight glasses
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Level gauges (transparent & reflex types)
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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 furnaces and process windows
It is especially suitable where borosilicate glass fails due to temperature or pressure limits.
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 light) |
Common Thickness Options
Standard thickness (can be customized):
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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 working pressure, window size, and installation method.
Common Rectangular Sizes (mm)
Frequently supplied sizes for sight glass applications:
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50 × 100
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60 × 120
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70 × 140
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80 × 150
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100 × 200
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120 × 250
Custom sizes and drawings are fully supported for OEM or replacement requirements.
Edge Finishing & Surface Options
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Ground edges / chamfered edges
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Polished surface (standard)
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Drilled holes (on request)
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Tolerance control suitable for gasket sealing
Compatible with graphite gaskets, mica gaskets, and PTFE sealing systems.
Why Choose Our Quartz Rectangular Glass (Trust Signals)
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Direct manufacturer & exporter
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Stable supply for B2B bulk orders
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OEM & drawing-based customization
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Export experience to Europe, North America, and Southeast Asia
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Strict inspection before shipment
We focus on industrial-grade reliability, 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 size & thickness
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Installation structure (frame / gasket type)
Our engineers 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.
