| 摘要 |
Provided is a tempered glass having a compression stress layer in a surface thereof, comprising, as a glass composition in terms of mol %, 50 to 75% of SiO2, 3 to 13% of Al2O3, 0 to 1.5% of B2O3, 0 to 4% of Li2O, 7 to 20% of Na2O, 0 to 10% of K2O, 0.5 to 13% of MgO, 0 to 6% of CaO, and 0 to 4.5% of SrO, and being substantially free of As2O3, Sb2O3, PbO, and F.
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