Glass composition

Details Glass composition Glass composition

1997-01-15

1998-12-01

Green, Anthony

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 65, 501 66, 501 68, 501 69, 501 70, 313493, C03C 3093

Patent

active

058438564

ABSTRACT:
The invention relates to a glass composition for electric lamps which glass composition comprises SiO.sub.2, Al.sub.2 O.sub.3, Na.sub.2 O, K.sub.2 O and B.sub.2 O.sub.3 as well as optionally Li.sub.2 O, CaO, MgO, SrO, Sb.sub.2 O.sub.3, Fe.sub.2 O.sub.3, MnO.sub.2 and/or CeO.sub.2. The composition according to the invention is characterized in that it, in addition to the components listed, comprises ZnO and optionally TiO.sub.2 and/or P.sub.2 O.sub.5 as well, its Al.sub.2 O.sub.3 content is 0.3 to 2 mass %, ZnO content is 2.5 to 8 mass %, B.sub.2 O.sub.3 content is 1.5 to 7.5 mass % and the total amount of Al.sub.2 O.sub.3 and TiO.sub.2 is at least 1 mass %, while the total amount of MgO and ZnO is equal to or greater than the amount of B.sub.2 O.sub.3. The invention also relates to stems and bulbs made of the glass composition according to the invention.

REFERENCES:
patent: 4312952 (1982-01-01), Carbol
patent: 4540672 (1985-09-01), Boudot et al.
patent: 4562161 (1985-12-01), Mennemann et al.
patent: 4565791 (1986-01-01), Boudot et al.
patent: 5077240 (1991-12-01), Hayden et al.
patent: 5403789 (1995-04-01), Kerko et al.
patent: 5405811 (1995-04-01), Kerko et al.
patent: 5525553 (1996-06-01), Brocheton et al.

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