A window is a flat quartz component installed as a sealed viewing or light-transmission port — the spec that matters is clear aperture (the usable optical area inside a mounting frame or seal) alongside size and thickness, not just the raw plate dimension.
Dimensions
| Parameter | Specification |
|---|---|
| Overall size | Per drawing |
| Thickness | Per drawing, sized to the application’s pressure/vacuum/mechanical requirement |
| Clear aperture | The usable optical area within the mounting/seal — smaller than overall size, specified separately |
| Surface | Optical-grade polish for demanding transmission; general finish for viewing-only use |
Application Categories
| Use | Requirement Driver |
|---|---|
| Optical / vacuum viewport | Clear aperture, surface quality, sealed mounting compatibility |
| High-temperature process window | Thickness for thermal stress, continuous operating temperature up to 1150–1250°C |
| General industrial viewing | Lower-spec finish, cost-driven |
Windows requiring a defined spectral transmission range (JGS1/2/3 selection) are covered on Optical Quartz Plates & Windows; curved or pressure-rated windows are covered on Curved / High-Pressure Windows.
Material
Standard clear fused quartz for general viewing; UV-grade for transmission-critical use — see the JGS grade table on Optical Quartz Plates & Windows.
FAQ
What’s the difference between “overall size” and “clear aperture”?
Overall size is the full window dimension you order; clear aperture is the smaller usable optical area once the window is mounted or sealed in its frame — always confirm both, since the mounting method reduces usable area.
Do I need this page or Curved / High-Pressure Windows?
If your window is flat and doesn’t carry a pressure rating requirement, this page. If it needs a curved/domed profile or a specific pressure differential rating, use Curved / High-Pressure Windows.