Commercial Quality Windows, Circular, S1-UV Grade Fused Silica


Diameter Tolerance

+/- 0.125 mm

Thickness Tolerance

+/- 0.125 mm

Surface Accuracy

~5 wave per inch

Surface Quality

60-40, scratch-dig or better




Fine ground and beveled

Commercial Quality Windows, Circular, S1-UV Grade Fused Silica

Esco PN:
  • $ 1430

Commercial windows are used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows and welding window substrates. Esco carries a complete inventory of circular or round commercial quality windows of S1-UV Grade Fused Silica.  


Ask a Question
  • What would be the weight of a window 20 inches diameter, 2 inches thick?

    Hello Mike, thank you for your question. The density of Fused Silica is 2.2046 grams/cubic centimeter. Which leads us to our calculation of 20 inch diameter window at 2” thick would be 50.05 lbs. It’s a good sized window and if you’d like a custom quote please follow this link to our custom quote tool and we should have a cost back to you quickly. 

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Esco Optics is a leading manufacturer of custom and catalog optics, precision optical components, and ITAR optics in the United States.

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ITAR registered and compliant, Esco manufactures ITAR optics for all of its customers with the strictest confidentiality.