Patent ID: 8455378

Claim:
An alkali metal-free glass, which: has a glass composition being substantially free of an alkali metal oxide, As 2 O 3 , and Sb 2 O 3 , comprising, in terms of mol %, 55 to less than 70% of SiO 2 , 7 to 15% of Al 2 O 3 , 7 to 12% of B 2 O 3 , 0 to 3% of MgO, 7 to 12% of CaO, 0 to 5% of SrO, 0.01 to 1% of BaO, 0 to 5% of ZnO, and 0.01 to 1% of SnO 2 ; and has a liquidus viscosity of 10 5.2 dPa·s or higher, a temperature corresponding to a viscosity of 10 2.5 dPa·s of 1,550° C. or lower, and a thermal expansion coefficient over a temperature range of 30 to 380° C. of larger than 34×10 −7 /° C. to 45×10 −7 /° C.