Importance

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Abstract

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 in mass %, and substantially devoiding 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 in mass %, and substantially devoiding 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 electrical heating, a glass material prepared to have a predetermined composition; a forming step for forming, 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 so as to reduce the heat shrinkage rate of the flat glass sheet.

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First Claim