Patent ID: 6329310
Filing Date: 2001-12-11
Classification: C03C

Abstract:
An alkali-free aluminoborosilicate glass comprising the following composition in % by weight, based on oxide:SiO.sub.2 60.5-69 B.sub.2 O.sub.3 0.5-4.5 Al.sub.2 O.sub.3 15-24 MgO 3-10 CaO 0-10 SrO 0.5-8 BaO 0.5-5.5 with MgO + CaO + SrO + BaO 8-19 SnO.sub.2 0.1-2 ZrO.sub.2 0-2 TiO.sub.2 0-2 CeO.sub.2 0-1 ZnO 0 < 1.