Alumino earth-alkali silicate glass for lamp bulbs of tungsten halogen incandescent lamps

Hlinitokremicitanové sklo s kovy alkalických zemin pro banky wolframových halogenových žárovek, které má následující složení v % hmotn.: SiO.sub.2 .n.55,0 až 62,5, Al.sub.2.n.O.sub.3 .n.14,5 až 18,5, B.sub.2.n.O.sub.3 .n.0 až 4,0, BaO 7,5 až 17,0, CaO 6,5 až 13,5, MgO 0 až 5,5, SrO 0 až 2,0, ZrO.sub.2 .n.0 až 1,5, TiO.sub.2 .n.0 až 1,0, ZnO 0 až 0,5, CeO.sub.2 .n.0 až 0,3, R.sub.2.n.O méne než 0,03, H.sub.2.n.O 0,033 až 0,041. Použití tohoto skla jako banek pro wolframové halogenové žárovky o teplotách mezi 550 .degree.C a 700 .degree.C. In the present invention, there is disclosed alumino earth-alkali silicate glass for lamp bulbs of tungsten halogen incandescent lamps having the following glass composition: SiOi2 55.0 to 62.5 percent by weight, Ali2Oi3 14.5 to 18.5 percent by weight, Bi2Oi3 0 to 4.0 percent by weight, BaO 7.5 to 17.0 percent by weight, CaO 6.5 to 13.5 percent by weight, MgO 0 to 5.5 percent by weight, SrO 0 to 2.0 percent by weight, ZrOi2 0 to 1.5 percent by weight, TiOi2 0 to 1.0 percent by weight, ZnO 0 to 0.5 percent by weight, CeOi2 0 to 0.3 percent by weight, Ri2O less than 0.03 percent by weight and HÝ2O 0.033 to 0.041 percent by weight. There is also disclosed the use of the above-described glass for lamp bulbs of tungsten halogen incandescent lamps with temperatures of above 550 degC. up to 700 degC.