Earth-alkaline aluminoborosilicate glass for lamp bulbs

摘要

The invention relates to an aluminoborosilicate glass containing alkaline earth metals for lamp bulbs which have molybdenum components and bulb temperatures of at most 650 DEG C. The glass has the following composition (in % by weight, based on oxide): SiO2 59-61; Al2O3 13.5-15.5; B2O3 3-5; MgO 2.3-5; CaO 8.2-0.5; BaO 8.5-9.5; CeO2 0.03-0.3 where (MgO+CaO)/BaO<1.60; CaO/MgO<4.20 and an alkali metal oxide content of <0.08% by weight and a water content of