BK7 Optical Glass

Special Properties

High quality optical glass
Practically bubble and inclusion free
Very clear and colorless appearance
Made of purest raw materials

Typical Applications

General optical applications
Mirror substrates
Substrates for mirror coatings
Substrate for filter coatings
Measurement and Sensor-Technology

BK7 is a very, if not the most, common technical optical glass for high quality optical components Optical BK7 windows in the visible range. BK7 is a relatively hard bor-crown glass and shows a good scratch resistance. BK7 has a very low amount of inclusions and is almost bubble-free. Another reason for choosing BK7 is the high linear optical transmission in the visible range down to 350nm. Because of stable chemical properties of BK7, no special treatment is required to grind and polish the material. BK7 is produced in strips and blocks up to about 350mm wide and about 70mm thick and can be fabricated to any smaller size. Larger BK7 strips and dimensions are available on request.