Glass plate for substrate, method for producing same, and method for producing tft panel

摘要

Provided is a glass plate having a small B 2 O 3 content and a ²-OH value (mm -1 ) of 0.05 to 0.5, and which can be suitably used as a glass substrate for a TFT panel. The glass plate for a substrate contains, as a glass matrix composition, in mol% on the oxide basis, SiO 2 : 67 to 72, Al 2 O 3 : 1 to 7, B 2 O 3 : 0 to 4, MgO: 11 to 15, CaO: 0 to 3, SrO: 0 to 3, BaO: 0 to 4, ZrO 2 : 0 to 4, Na 2 O: 8 to 15, and K 2 O: 0 to 7, with SiO 2 +Al 2 O 3 : 71 to 75.2, MgO+CaO+SrO+BaO: 11 to 17, Na 2 O+K 2 O: 8 to 17, and satisfying 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, in which the glass plate has a ²-OH value (mm -1 ) of 0.05 to 0.5, and a heat shrinkage ratio (C) of 16 ppm or less.