CPC C03C 3/087 (2013.01) [C03C 21/002 (2013.01)] | 19 Claims |
1. A chemically tempered glass sheet comprising the following in weight percentage, expressed with respect to a total weight of glass:
65≤SiO2≤78%;
5≤Na2O≤20%;
1≤K2O<8%;
1≤Al2O3<6%;
2≤CaO<10%;
0≤MgO≤8%;
total iron content expressed as Fe2O3 of from 0.06<Fe2O3≤1.7%, and
a K2O/(K2O+Na2O) ratio which is from 0.1 to 0.7,
wherein the glass sheet is boron, strontium, and lithium free.
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