Patent ID: 6432853
Filing Date: 2002-08-13
Classification: C03C

Abstract:
A leaded, copper boroaluminosilicate glass having a composition, as expressed in weight percent on an oxide basis, that consists essentially of: about 27% to about 60% SiO2; about 3% to about 14% Al2O3; about 9% to about 28% B2O3; about 0.1% to about 40% PbO; about 0.1% to about 11% CuO; and including 0.0% to about 10% R2O, wherein R2O is an alkali oxide selected from the group consisting of Li2O, K2O, Na2O, Rb2O, and Cs2O; and said glass has a coefficient of thermal expansion (CTE) in the range of about 25-55Ã—10âˆ’7/Â°C. over a temperature range of 25-300Â° C.