GLASS

摘要

1347830 Optical flint glass CARL-ZEISSSTIFTUNG [trading as JENAER GLASWERK SCHOTT & GEN] 25 July 1972 [28 July 1971] 34752/72 Heading C1M Optical flint glass consists of (in weight per cent): the maximum content of TiO 2 +PbO being 54 and TiO 2 + PbO + (Nb 2 O 5 and/or Ta 2 O 5 ) being 33-72. The glass may have a refractive index n d of 1À65-1À87 and an optical dispersion v d of 32-21.