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Abstract

Provided is a glass composition suitable for production using large-scale sheet glass mass production facilities by the float process or the like, having high heat resistance, and suitable for chemical strengthening. Specifically, provided is a glass composition containing, in mass %: 60 to 66% SiO₂; 10 to 16% Al₂O₃; 0 to 1% B₂O₃; 3 to 10% MgO; 0 to 1% CaO; 1 to 9% SrO; O to 4% BaO; 0 to 2% ZnO; 0 to 1% Li₂O; 10 to 20% Na₂O; 0 to 5% K₂O; O to 2% TiO₂; 0 to 0.1% ZrO₂; and 0 to 2% total iron oxide in terms of Fe₂O₃. In this glass composition, a total content of MgO, CaO, SrO, and BaO is in a range of 10 to 20%, a total content of Li₂O, Na₂O, and K₂O is in a range of 14 to 20%, and a content of SrO is higher than a content of CaO.

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