Fluorophosphate opal glasses

Details Fluorophosphate opal glasses Fluorophosphate opal glasses

1980-08-13

1981-11-03

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 57151, C03C 304, C03C 308

Patent

active

042983908

ABSTRACT:
This invention is directed to spontaneous opal glasses wherein Ba.sub.2 F(PO.sub.4) constitutes the predominant crystalline opal phase. The glasses exhibit softening points in excess of 710.degree. C., excellent chemical durability, and consist essentially, in weight percent on the oxide basis, of 6-10% Na.sub.2 O, 1-6% K.sub.2 O, 4-11% BaO, 9-18% Al.sub.2 O.sub.3, 50-70% SiO.sub.2, 3.5-7% P.sub.2 O.sub.5, and 1-4% F.

REFERENCES:
patent: 2394502 (1946-02-01), Weyl et al.
patent: 2559805 (1951-07-01), Stookey
patent: 3498805 (1970-03-01), Stalego

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