Spontaneous opal glasses

Details Spontaneous opal glasses Spontaneous opal glasses

1977-04-04

1978-03-21

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 396, 106 54, C03C 304, C03C 308, C03C 330

Patent

active

040802159

ABSTRACT:
This invention is concerned with spontaneous opal glasses wherein sodium fluoride (NaF) and strontium fluoride (SrF.sub.2) constitute the predominant opacifying phases. More specifically, the opal glasses of the instant invention have compositions within the Na.sub.2 O--SrO--Al.sub.2 O.sub.3 --SiO.sub.2 --F field and exhibit a dense white appearance, a softening point above 755.degree. C., a strain point in excess of 500.degree. C., a coefficient of thermal expansion (0.degree.-300.degree. C.) in excess of 65.degree. .times. 10.sup.-7 /.degree. C., and satisfactory resistance to weathering and dishwasher environments.

REFERENCES:
patent: 2921860 (1960-01-01), Stockey
patent: 3622359 (1971-11-01), Dither et al.
patent: 3681098 (1972-08-01), Dumbaugh, Jr. et al.
patent: 4038448 (1977-07-01), Boyd et al.

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