| CPC C03C 3/087 (2013.01) [C03C 21/002 (2013.01)] | 16 Claims |
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1. A glass composition for chemical strengthening, comprising, as components, in mol %:
66 to 71% SiO2;
1 to 5% Al2O3;
4 to 8% MgO;
4 to 6.00% CaO;
14 to 16% Na2O; and
0.7 to 1.3% K2O, wherein, in mol %,
MgO+CaO+SrO+BaO+ZnO is 10% or more and 14% or less,
a molar ratio MgO/(MgO+CaO) is 0.54 to 0.7, and
a molar ratio Na2O/(Na2O+K2O) is 0.9 to 0.97.
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