Patent ID: 6436859
Filing Date: 2002-08-20
Classification: C03C

Abstract:
A lithium-sodium-aluminosilicate glass composition, comprising in terms of percentage by weight 58-66% SiO2, 7-15% Al2O3, 4-7% Li2O, 10-15% Na2O, 0-3% K2O, 0-4% MgO, 0-4% CaO, 0-2% SrO, 1-10% BaO, 0-5% TiO2 and 1-6% ZrO2,wherein the glass composition has a softening point of 700Â° C. or lower; wherein a first temperature at which the glass composition exhibits a viscosity of 102 poises is 1450Â° C. or lower; wherein a second temperature at which the glass composition exhibits a viscosity of 104 poises is 1000Â° C. or lower; and wherein the glass composition has a mean thermal expansion coefficient between 30Â° C. and a glass transition temperature within a range of from 90Ã—10âˆ’7/Â° C. to 130Ã—10âˆ’7/Â° C.