| 摘要 |
A glass composition which is reduced in the amount of residual bubbles and is produced using smaller amounts of arsenic oxide and antimony oxide, which impose a heavy burden on the environment. This glass composition comprises, in terms of mass%: 40-70% SiO2; 5-20% B2 O3; 10-25% Al2O3; 0-10% MgO; 0-20% CaO; 0-20% SrO; 0-10% BaO; 0.001-0.5% Li2O; 0.01-0.5% Na2 O; 0.002-0.5% K2O; and 0-1.0%, excluding 0%, Cl. |
