摘要 |
Provided are: a glass substrate that achieves a high strain point while having a low devitrification temperature; and a method for producing said glass substrate. This glass substrate for a display is made of a glass comprising SiO2 and Al2O3, comprising 0% or more to less than 3% B2O3 and from 5 to 14% BaO as expressed in mass%, and substantially comprising no Sb2O3, wherein the devitrification temperature is 1235°C or lower and the strain point is 720°C or higher. Alternatively, this glass substrate for a display is made of a glass comprising SiO2 and Al2O3, comprising 0% or more to less than 3% B2O3, 1.8% or more MgO, and from 5 to 14% BaO as expressed in mass%, and substantially comprising no Sb2O3, wherein (SiO2+MgO+CaO)-(Al2O3+SrO+BaO) is less than 42%, the devitrification temperature is 1260°C or lower, and the strain point is 720°C or higher. This method for producing said glass substrate for a display comprises: a melting step for melting, by using at least direct ohmic heating, a glass material prepared to have a predetermined composition; a molding step for molding, into a flat glass sheet, the molten glass that has been melted in the melting step; and an annealing step for annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled such that the heat shrinkage rate of the flat glass sheet is reduced. |