Patent ID: 8084381

Claim:
Glass, in terms of % by mass on the basis of oxides, comprising: 40 to 64% of SiO 2 , 10 to 30% of B 2 O 3 , 12.5 to 25% of Al 2 O 3 , 1 to 10% of ZnO, 1.4 to 10% of BaO, wherein said glass contains no alkali metal oxide component, an average linear thermal expansion coefficient at 0° C. to 50° C. is not more than 40×10 −7 ° C. −1 , and the ratio of SiO 2 /Al 2 O 3 in terms of % by mass is not more than 3.2, and the ratio of B 2 O 3 /Al 2 O 3 in terms of % by mass is not less than 0.8.