This page covers quartz windows where curvature and pressure rating are the defining spec — not flatness and clear aperture alone (see Quartz Windows for that case). Because quartz can’t be tempered, its pressure resistance comes entirely from thickness and geometry, which is why this page treats them as one connected spec rather than separate parameters.
Configuration Options
| Configuration | Use |
|---|---|
| Flat | Standard viewing/process window, pressure rating from thickness alone |
| Domed | Higher pressure differential tolerance at the same diameter than flat, via curvature-driven load distribution |
| Arched / cylindrical segment | Curved viewing port matched to a cylindrical vessel wall |
Dimensions & Pressure Relationship
| Parameter | Specification |
|---|---|
| Diameter | Custom, 25mm to 300mm+ cited range |
| Thickness | Engineered to the specific operating pressure, temperature, and diameter combination — not a fixed lookup, confirm with your full operating envelope |
| Radius of curvature (domed) | Set to withstand the pressure differential at the operating temperature; larger radius/shallower dome for lower-pressure-differential, high-temperature service |
Because quartz resists pressure less well than tempered borosilicate or soda-lime at the same thickness (quartz cannot be tempered), the compensating factor is always thickness and/or curvature — confirm your full pressure/temperature/diameter envelope so thickness can be engineered correctly, not assumed from a flat-window reference.
Thermal & Chemical Performance
- Rapid thermal cycling resistance between process temperature and ambient — the reason quartz is chosen over tempered glass alternatives despite the pressure tradeoff
- Low-extractable fused silica option for pharmaceutical/semiconductor contamination-sensitive installations
- Compatible with CIP/SIP cleaning protocols where GMP compliance is required
Surface Finish
Optical-quality fire-polished surfaces standard for camera and sensor-based process monitoring.
Application
High-temperature/high-pressure process viewing, vacuum chamber observation ports, UV lamp shielding, pharmaceutical and semiconductor process vessels requiring both pressure integrity and optical clarity.
FAQ
Why choose a domed window over a flat one?
A domed profile distributes pressure load more effectively than a flat pane at the same thickness, letting you hold a higher pressure differential — or use thinner material — at a given diameter.
What information do you need to engineer the right thickness?
Your full operating envelope: pressure differential, operating temperature, and diameter together — thickness is engineered against all three, not looked up from diameter alone.
Can quartz match the pressure rating of tempered borosilicate at the same thickness?
Generally no — quartz can’t be tempered, so it has lower pressure resistance than tempered glass at equal thickness. The workaround is increasing thickness and/or using curvature, which is standard practice for high-pressure quartz windows.