Process for preparing a borosilicate glass

Details Process for preparing a borosilicate glass Process for preparing a borosilicate glass

1989-11-03

1990-07-31

Lindsay, Robert L.

Glass manufacturing

Processes

Operating under inert or reducing conditions

65 3011, 501 13, 501 66, C03C 3091, C03C 2300, C03B 3200

Patent

active

049447840

ABSTRACT:
A process for preparing a surface-darkened glass is disclosed. In the first step of the process, a specified alkali alumino-borosilicate glass which contains a minor amount of antimony trioxide is provided. Thereafter, this glass is heated to a temperature of from about 350 to about 1,000 degrees Celsius while being contacted with hydrogen-containing gas. The presence of the antimony trioxide in the glass facilitates the darkening of its surface.

REFERENCES:
patent: 3419370 (1968-12-01), Cramer et al.
patent: 3449103 (1969-06-01), Stookey
patent: 3689242 (1972-09-01), Platakis et al.
patent: 3756798 (1973-09-01), Ernsberger
patent: 4065283 (1977-12-01), Asahara et al.
patent: 4130680 (1978-12-01), Ference et al.
patent: 4240836 (1980-12-01), Borrelli et al.
patent: 4475059 (1984-10-01), Sink
patent: 4613786 (1986-09-01), Holland et al.

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