| 摘要 |
This invention relates to the production of transparent, high silica glass envelopes for tungsten-halogen lamps consisting essentially, by weight, of 1-2.5% Al2O3, 0.25-1% CaO, 0.1-0.25 Na2O and/or K2O, 2.5-3.5% B2O3, 0.15-0.3% F, and the remainder SiO2.
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