Chemically durable, high index, low density glasses

Details Chemically durable, high index, low density glasses Chemically durable, high index, low density glasses

C - Chemistry, Metallurgy

03

C

261/14

C03C 3/068 (2006.01)

Patent

CA 1305190

Abstract of the Disclosure This invention is directed to the production of glasses especially suitable for use as ophthalmic lenses which exhibit indices of refraction between about 1.699- 1.703, Abbe numbers equal to or greater than 41.0, densities less than 3.25 g/cm3, and good resistance to attack by acids. The glasses are essentially free of Al2O3 and consist essentially, in weight percent on the oxide basis, of: Image

570407

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