Spontaneous opal glass compositions

Details Spontaneous opal glass compositions Spontaneous opal glass compositions

1983-06-02

1984-03-27

Bell, Mark

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 57, 501 70, 501 72, C03C 304, C03C 310, C03C 330

Patent

active

044395280

ABSTRACT:
The present invention is directed to the production of spontaneous opal glasses exhibiting softening points in excess of 750.degree. C., a coefficient of thermal expansion between about 60-90.times.10.sup.-7 /.degree.C., a crystal liquidus temperature below 1350.degree. C., a liquidus viscosity of at least 200 poises, and excellent resistance to attack by alkalies. Spherically-shaped glassy droplets constitute the opal phase in the glasses which consist essentially, in weight percent, of

REFERENCES:
patent: 3275492 (1966-09-01), Herbert
patent: 3661601 (1972-05-01), Dumbaugh et al.
patent: 3681098 (1972-08-01), Dumbaugh et al.
patent: 4311529 (1982-01-01), Danielson et al.
patent: 4323653 (1982-04-01), Holland et al.

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