Patent ID: 11878938
Assignee: CDGM GLASS CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  G | IPC C

Claim 7:
8. The optical glass according to claim 1, having
a refractive index of 1.87 to 1.89,
an abbe number of 39.0-41.0,
a λ70 of not more than 390 nm,
a λ5 of not more than 350 nm,
a devitrification temperature having an upper limit of not higher than 1300° C.,
a durability of water of not lower than grade 2,
a durability of acid of not lower than grade 2,
a climatic resistance is not lower than grade 2,
a striae of above grade A,
an extent of bubble of not lower than grade A00, and
a density of not higher than 5.5 g/cm3.