| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide strengthened glass and a strengthened glass plate which is high in ion exchange performance and devitrification resistance, has resistance to deterioration of KNOmolten salt and is suppressed in occurrence of warp even when a large-sized glass plate is subjected to a strengthening treatment.SOLUTION: Strengthened glass has a compression stress layer on the surface and a glass composition comprising, by mol%, 50-75% SiO, 3-13% AlO, 0-1.5% BO, 0-4% LiO, 7-20% NaO, 0.5-10% KO, 0.5-13% MgO, 0-6% CaO and 0-4.5% SrO and contains practically no AsO, SbO, PbO and F.</p> |
