Borosilicate glass for electronic flash lamps
AssigneeSchott Glaswerke
InventorPeter Brix
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Abstract
A borosilicate glass is described of the composition on oxide basis in % by weight of 50-75 SiO.sub.2, 11-18 B.sub.2 O.sub.3, 1-5 Al.sub.2 O.sub.3, 0-3 Li.sub.2 O, 0-3 Na.sub.2 O, 0-2 K.sub.2 O, 9-22 Cs.sub.2 O, 0-2 ZnO, 0-2 MgO, 0-3 CaO, 0-3 SrO, 0-3 BaO, provided that the sum of the alkali oxides, apart from Cs.sub.2 O, is at most 5 and the sum of the alkaline-earth oxides plus ZnO is at most 6. The glass is especially suitable for the production of electronic flash lamps, which with this glass reach a multiple of the service life of electronic flash lamps made from the conventional glass.
Claims11
A uniformly clear finished borosilicate glass in the form of a hollow tube for electronic flash lamps consisting essentially of
- ______________________________________ SiO.sub.2 50-75 wt. % B.sub.2 O.sub.3 11-18 wt. % Al.sub.2 O.sub.3 1-5 wt. % Cs.sub.2 O 9-28 wt. % Li.sub.2 O.sub.3 0-3 wt. % Na.sub.2 O 0-3 wt. % K.sub.2 O 0-2 wt. % ZnO 0-2 wt. % MgO 0-2 wt. % CaO 0-3 wt. % SiO 0-3 wt. % BaO 0-3 wt. % ______________________________________
- wherein the total weight of alkali oxides, except for Cs.sub.2 O, has a maximum value of 5 wt. %, and the total weight of alkaline earth oxides plus ZnO falls within the range of 0-6 wt. %, and where wt. % is based on the weight of the total oxide, and optionally 1.5 wt. % based on the weight of the total oxides of a fining agent selected from the group consisting of Sb.sub.2 O.sub.3, CrO.sub.2, NaCl and As.sub.2 O.sub.3.
A borosilicate glass for electronic flash lamps consisting essentially of
- ______________________________________ SiO.sub.2 50-75 wt. % B.sub.2 O.sub.3 11-18 wt. % Al.sub.2 O.sub.3 1-5 wt. % Cs.sub.2 O 9-28 wt. % Li.sub.2 O.sub.3 0-3 wt. % Na.sub.2 O 0-3 wt. % K.sub.2 O 0-2 wt. % ZnO 0-2 wt. % MgO 0-2 wt. % CaO 0-3 wt. % SiO 0-3 wt. % BaO 0-3 wt. % ______________________________________
- wherein the total weight of alkali oxides, except for Cs.sub.2 O, has a maximum value of 5 wt. %, and the total weight of alkaline earth oxides plus ZnO falls within the range of 0-6 wt. %, and where wt. % is based on the weight of the total oxide, and optionally 1.5 wt. % based on the weight of the total oxides of a fining agent selected from the group consisting of CrO.sub.2, NaCl, and As.sub.2 O.sub.3.
Dependencies are inferred from the claim text.