Alkali free glass

Details Alkali free glass Alkali free glass

1992-04-24

1993-09-14

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 67, 501 70, C03C 3091, C03C 3087

Patent

active

052448479

ABSTRACT:
An alkali free glass having a strain point of at least 650.degree. C. and consisting essentially of from 55 to 65 wt % of SiO.sub.2, from 10 to 18 wt % of Al.sub.2 O.sub.3, from 0 to 3 wt % of B.sub.2 O.sub.3, from 0 to 3 wt % of MgO, from 8 to 15 wt % of CaO, from 8 to 15 wt % of SrO and from 0 to 3 wt % of ZnO and essentially free from alkali metal oxides and BaO.

REFERENCES:
patent: 3847627 (1974-11-01), Erickson et al.
patent: 3978362 (1976-08-01), Dumbaugh, Jr. et al.
patent: 4180618 (1979-12-01), Alpha et al.
patent: 4255198 (1981-03-01), Danielson et al.
patent: 5116788 (1992-05-01), Dumbaugh, Jr.
patent: 5116789 (1992-05-01), Dumbaugh, Jr. et al.
Chemical Abstracts, 66619b, vol. 95, No. 8, Aug. 1981, & JP-A-56 032 347, Apr. 1, 1981, p. 288, "Glass for Tungstenhalogen Electric Lamps".

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