Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
501 75, 501 76, 501 78, 501 79, 501901, 501903, C03C 308, C03C 310
An optical and ophthalmic glass having an index of refraction of .gtoreq.1.69, an Abbe number of .gtoreq.37, and a density of .ltoreq.3.30 g/cm.sup.3, consists essentially of (in % by weight):
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patent: 4084978 (1978-04-01), Sagara
patent: 4194916 (1980-03-01), Kumata et al.
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