Glass composition

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501 67, 501 69, 501 70, 501 72, 313480, 313636, C03C 389

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058859152

ABSTRACT:
The subject-matter of the invention is a glass composition, which is suitable for use in electric lamps, comprising SiO.sub.2, Al.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O, Li.sub.2 O, SrO, B.sub.2 O.sub.3, and optionally CaO, MgO, TiO.sub.2, P.sub.2 O.sub.5, Sb.sub.2 O.sub.3, Fe.sub.2 O.sub.3, MnO.sub.2, ZnO and/or CeO.sub.2. It is characterized in that its SiO.sub.2 content is 65-73 mass %, Al.sub.2 O.sub.3 content is 0.5 to 2.5 mass %, Na.sub.2 O content is 5 to 9 mass %, K.sub.2 O content is 8 to 12 mass %, Li.sub.2 O content is 0.4 to 1.5 mass %, SrO content is 0.5 to 5 mass %, B.sub.2 O.sub.3 content is 2.1 to 5 mass %. Furthermore in addition to the components listed, it optionally also comprises maximum 2.5 mass % CaO, maximum 3.8 mass % MgO, maximum 1 mass % TiO.sub.2, maximum 0.8 mass % P.sub.2 O.sub.5, maximum 0.5 mass % Sb.sub.2 O.sub.3, maximum 0.25 mass % Fe.sub.2 O.sub.3, maximum 0.25 mass % MnO.sub.2, maximum 5 mass % ZnO, and/or maximum 0.8 mass % CeO.sub.2 with the condition that the total amount of SrO, ZnO and MgO in the composition is at least 1.7 mass %. Stems and bulbs made from the above glass composition and used in electric lamps are also subject matter of the invention.

REFERENCES:
patent: 5391523 (1995-02-01), Marlor
Database WPI, Section Ch, Week 7432, Derwent Publications Ltd., London, GB; Class L02, AN 74-57500V, XP002046648 & JP 49 006 012 A (Tokyo Shibaura Electric Co), 19 Jan. 1974 *abstract*.
Chemical Abstracts, vol. 123, No. 16, 16 Oct. 1995, Columbus, Ohio, US; abstract No. 206791, Halfar, Jaroslav: "Lead-free crystal glass", XP002046647, *abstract* & CZ 278 012 A (Ornela, A. S., Czech Rep.).

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