| 摘要 |
The invention relates to a glass sheet having a boron-and lithium-free glass composition comprising the following in weight percentage, expressed with respect to the total weight of glass : 65 ≤ SiO2≤ 78 % 5 ≤ Na2O ≤ 20 % 0 ≤ K2O < 5 % 1 ≤ Al2O3 < 4 % 0 ≤ CaO < 4.5 % 4 ≤ MgO ≤ 12 %; as well as a (CaO/MgO) ratio which is less than 1. The invention corresponds to an easy chemically-temperable soda-silica type glass composition, which is more suited for mass production than aluminosilicate glass, and therefore is available at low cost, and with a base glass /matrix composition that is close to or very similar to compositions already used in existing mass production. |
