This document applies to circular sight glasses of tempered soda-lime-glass.
DIN 8902:1996 history
2020DIN 8902:2020-08 Pressure resistant circular sight glasses of soda-lime-glass / Note: DIN 8902 (1996-02) remains valid alongside this standard until 2021-01-31.
2020DIN 8902:2020 Pressure resistant circular sight glasses of soda-lime-glass
1970DIN 8902 E:2019-11 Pressure resistant circular sight glasses of soda-lime-glass without limitation in the range of low temperature