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Fused Silica Viewports

Fused Silica Viewports

Larson Electronic Glass’s  fused silica viewports are preferred over glass because of their transparency to ultraviolet radiation, higher abrasion resistance, and low coefficient of thermal expansion which makes them very resistant to thermal shock. While fused quartz and fused silica viewports are both silicon dioxide (SiO2), fused silica, which is synthetically grown, is superior to a fused quartz viewport in most regards and does not fluoresce when exposed to UV radiation at 253.7µm as will fused quartz.

NOTE: Maximum bakeout temperature limited to 200°C due to low temperature braze alloy.

Fused silica viewports are offered with CF type, ISO type Kwik-Flange® and Large-Flange®. Viewport window surfaces offer a minimum of distortion and provide maximum transmission for most applications.

Fused Silica Viewports:


  • High purity fused silica UV grade
  • Low loss ultraviolet transmission
  • Resistant to thermal shock
  • Nonmagnetic 304 stainless steel to fused silica, brazed seal
  • >90% Transmission from 230nm to 2000nm
  • Optional AR Coatings available
  • CF flanges bakeable to 200°C, 25°C/Min gradient
  • Kwik-Flange® and Large-Flange® bakeable to 200°C, 25°C/Min gradient

Request a quote today, or contact Larson Electronic Glass for help in selecting the right fused silica viewports for your application.


Standard Length

Standard Length

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