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