Commercial Quality Windows, Circular, Borofloat 33

Esco PN:
  • $ 653

Diameter Tolerance

+/- 0.125 mm

Thickness Tolerance

+/- 0.125 mm

Surface Accuracy

5λ per inch

Surface Quality

80-50 Scratch-Dig or better




Fine ground and safety beveled*

Clear Aperture


*parts under 25.4mm in diameter may not have beveled edges

Commercial windows are used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows, welding window substrates. Esco carries inventory of circular and square commercial optical windows of Borofloat 33 that is direct equivalent of Pyrex, which is no longer manufactured. Schott Borofloat 33 data sheet is available here.

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 modification would cost. 


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