Patent ID: 8835335
Filing Date: 2014-09-16
Classification: C03C

Abstract:
1. A glass, comprising, as a glass composition expressed in terms of oxides by mass %, 45 to 70% of SiO 2 , 10 to 30% of Al 2 O 3 , 13 to 20% of B 2 O 3 , 0 to 1% of MgO, 0 to 0.02% of TiO 2 , less than 0.1% of As 2 O 3 , less than 0.1% of Sb 2 O 3 , less than 0.01% of Cl, and 0.01 to less than 1% of alkali metal oxide, wherein a mass ratio of MgO/B 2 O 3 is less than 0.05, and wherein the glass has a thermal expansion coefficient (30 to 380° C.) of 30 to 35×10 −7 /° C.