Chemically durable phosphate opal glasses

Details Chemically durable phosphate opal glasses Chemically durable phosphate opal glasses

1980-11-03

1982-01-05

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65 33, 65 45, 501 63, C03C 304, C03C 308

Patent

active

043092187

ABSTRACT:
This invention relates to the manufacture of spontaneous opal glasses demonstrating a dense, milky-white appearance, excellent resistance to attack by water and detergents, softening points in excess of 760.degree. C., and containing either NaBaPO.sub.4 or Na.sub.5 P.sub.3 O.sub.10 as the predominant crystal phase. The glasses consist essentially, expressed in weight percent on the oxide basis, of 6-12% Na.sub.2 O, 5-16% BaO, 0.9-7% Al.sub.2 O.sub.3, 2-7% B.sub.2 O.sub.3, 55-70% SiO.sub.2, and 5-9% P.sub.2 O.sub.5.

REFERENCES:
patent: 2394502 (1946-02-01), Weyl
patent: 2559805 (1951-07-01), Stookey
patent: 3498801 (1970-03-01), Keul
patent: 3498805 (1970-03-01), Stalego
patent: 3506464 (1970-04-01), Baak et al.
patent: 3645711 (1972-02-01), Pirooz

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