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

Diameter Tolerance +/- 0.125 mm Thickness Tolerance +/- 0.125 mm Surface Accuracy ≤ 2λ per inch Surface Quality 60-40 Scratch-Dig or better Parallelism  <5' Edges Fine ground and safety beveled* Clear Aperture 90% *parts under 25.4mm in diameter may not have beveled edges Commercial windows are used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows and welding window substrates. Esco carries a complete inventory of circular commercial quality windows of S1-UV Grade Fused Silica.  Windows are polished both sides with ground edges.  Don't see a part that matches exactly what you need, perhaps you'd like to modify a dimension or add a coating?  Use our fast online quote tool to find out what a custom part would cost.