Tempered borisilicate glass
A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6145-00-290-3859
NSN 5999-00-954-5138
NSN 5910-00-501-1131
NSN 5915-01-534-7614
NSN 6145-00-905-3236
NSN 5965-01-296-8991
NSN 6110-01-610-9965
NSN 5905-00-899-4515
NSN 6320-00-224-3538
NSN 5910-01-350-8099
NSN 6240-01-367-6561
NSN 5950-00-584-4571