Patent ID: 8178453

Claim:
Non-lead glass comprising, as represented by mol % based on the following oxides, from 38 to 41.5% of SiO 2 , from 13 to 17% of MgO, 28 to 33% of CaO, from 0 to 2% of SrO, from 0 to 2.2% of BaO, from 5 to 12% of ZnO and from 4.5 to 7% of Al 2 O 3 , wherein the total content of these components is at least 97%, and when SrO and BaO are contained, the total content of SrO and BaO is at most 2%; wherein the molar ratio of CaO to MgO is from 1.8 to 2.2.