Glass for use as tungsten-halogen lamp envelopes

Details Glass for use as tungsten-halogen lamp envelopes Glass for use as tungsten-halogen lamp envelopes

1985-06-07

1986-08-19

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C03C 3087

Patent

active

046070168

ABSTRACT:
This invention is concerned with a narrowly-defined composition area of glasses in the alkaline earth aluminosilicate system especially suitable for fabricating tungsten-halogen lamp envelopes. The invention comprises the use of arsenic in the batch in such amounts as to yield about 0.17-0.3% by weight as analyzed in the glass as a secondary fining agent to insure a seed count no greater than 10/in.sup.3. The base glass compositions consist essentially, in weight percent, of about:

REFERENCES:
patent: 4302250 (1981-11-01), Danielson et al.

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