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

C - Chemistry, Metallurgy

03

C

261/20

C03C 3/085 (2006.01) C03C 3/087 (2006.01)

Patent

CA 1250323

Abstract of the Disclosure 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/in3. The base glass compositions consist essentially, in weight percent, of about: SiO2 64-68 BaO 0-5 CaO 11-14 SrO 0-4 Al2O3 16.5-18.5 BaO+SrO 2-6.5

506805

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