Acidproof, hydrolysis-resistant optical and ophathalmic glass of

Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...

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501 75, 501 76, 501 78, 501 79, 501901, 501903, C03C 308, C03C 310

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044004737

ABSTRACT:
An improved optical glass having an index of refraction of .gtoreq.1.69, an Abbe number of .gtoreq.38, and a density of .ltoreq.3.25 g/cm.sup.3, represents a further development of another optical glass recently provided by the same inventors. The new glass has improved suitability for continuous-tank manufacture and increased acidproofness and differs from the other glass in its content of 0.5-4.0% by weight of P.sub.2 O.sub.5 ; its sum total of SiO.sub.2 +B.sub.2 O.sub.3 +Al.sub.2 O.sub.3 +P.sub.2 O.sub.5 being 38.5-41.5% by weight; and its sum total of MgO+CaO being 13-17.5% by weight. The full glass composition, e.g. is in % by weight:

REFERENCES:
patent: 3877953 (1975-04-01), Bromer et al.
patent: 4084978 (1978-04-01), Sagara

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