Commercial windows are used for sight glasses, instrument windows, beamsplitter substrates, vacuum windows and welding window substrates. Esco carries a complete inventory of square commercial optical windows made from Borofloat 33 which is a direct equivalent to Pyrex, which is no longer manufactured. Windows are polished both sides.

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.