| 摘要 |
A borosilicate glass is described of the composition on oxide basis in % by weight of 50-75 SiO2, 11-18 B2O3, 1-5 Al2O3, 0-3 Li2O, 0-3 Na2O, 0-2 K2O, 9-22 Cs2O, 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 Cs2O, 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.
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