Patent ID: 9580352
Date: 2017-02-28
CPC Classifications: C03B,C03C

Claim:
1. A glass substrate for a display, the glass substrate being comprised of a glass comprising 52-78 mass % of SiO 3-25 mass % of Al 3-15 mass % of B 3-20 mass % of RO, wherein RO is total amount of MgO, CaO, SrO, and BaO, 0.01-0.8 mass % of R 0-0.3 mass % of Sb substantially not comprising As the glass having a mass ratio (SiO a mass ratio CaO/B wherein the heat shrinkage rate after performing a heat treatment in which the temperature is raised and lowered at a rate of 10° C./min and is kept at 550° C. for 2 hours is equal to or less than 75 ppm, the heat shrinkage rate being expressed by the following equation: wherein the glass exhibits a strain point equal to or greater than 695° C.