Alkali-free alumino:borosilicate glass

摘要: Alkali-free aluminoborosilicate glass has a viscosity of 10 dPas at above 700 deg C, working temperature less than 1220 C and very good chemical resistance, can be produced in float unit the composition (by wt., on oxide basis) 48 to 55 (preferably 49-53)% SiO2, 7-15 9-13)% B2O3, more 20 26 24)% Al2O3, 0-8 0-6)% MgO, 4-12 6-11)% CaO, 0-2 0-1)% BaO, SrO, 1-8 2-6)% ZnO, 0-2% ZrO2 0.52 0.5-1.5)% SnO2.