Patent ID: 8791036

Claim:
A glass plate for a substrate, comprising, as a glass matrix composition, in mol % on a basis of oxide moles: SiO 2 from 67 to 72, Al 2 O 3 from 1 to 7, B 2 O 3 from 0 to 4, MgO from 11 to 15, CaO from 0 to 3, SrO from 0 to 3, BaO from 0 to 4, ZrO 2 from 0 to 4, Na 2 O from 8 to 15, and K 2 O from 0 to 7, wherein SiO 2 +Al 2 O 3 is from 71 to 75.2, MgO+CaO+SrO+BaO is from 11 to 17, Na 2 O+K 2 O is from 8 to 17, and K 2 O/(Na 2 O+K 2 O)≦0.13×(SiO 2 +Al 2 O 3 +0.5B 2 O 3 +0.3BaO)−9.4 is satisfied, and wherein the glass plate has a β-OH value (mm −1 ) of from 0.05 to 0.5, and a heat shrinkage ratio (C) of 16 ppm or less.