Alumino-alkaline earth silicate glass used for bulbs in tungsten halogen glow lamps has a low water content

摘要

Alumino-alkaline earth silicate glass has a water content of 0.025-0.042 weight %. Preferred Features: The glass composition contains (in weight %): 55.0-62.0 SiO2, 14.5-18.5 Al2O3, 0.5-4.0 B2O3, 7.5-17.0 BaO, 6.5-13.5 CaO, 0-5.5 MgO, 0-2.0 SrO, 0-1.5 ZrO2, 0-1.0 TiO2, 0-0.5 ZnO, 0-0.3 CeO2, less than 0.03 R2O, and 0.025-0.042 H2O.