Patent ID: 8741794

Claim:
A glass substrate for a display, which is formed of a glass comprising, by mass %, 50 to 70% of SiO 2 , 5 to 18% of B 2 O 3 , 10 to 25% of Al 2 O 3 , 0 to 10% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of BaO, 5 to 20% of RO (in which R is at least one member selected from the group consisting of Mg, Ca, Sr and Ba), and 0.20% or more but 2.0% or less of R′ 2 O (in which R′ is at least one member selected from the group consisting of Li, Na and K), the glass containing, by mass %, 0.05 to 1.5% of an oxide of a metal that changes in valence number in a molten glass, the glass containing tin oxide as an essential component as a metal that changes in valence number in a molten glass, the glass substantially containing none of As 2 O 3 , Sb 2 O 3 and PbO, and the glass containing no halide ions except for a case where the glass contains them as impurities.