Windows are optical glass with ground and polished faces that are relatively parallel. They are used as a protective element between two environments and are neutral to the passage of visible light.
Experimental Grade Windows are offered in several experimental grade options. Grade 1 is standard optical glass, edged, free of visible scratches, chips, stains or oxidation. Grade 2 is unedged, non-optical glass, small chips, slight stains or other defects.
Note: Specifications for experimental grade optics may vary as much as 10% from those listed. Also, no additional information is available other than what is provided.