| 摘要 |
PURPOSE: A substrate glass composition is provided to achieve improved productivity by maintaining the liquid temperature at the level lower than the molding temperature and a high viscosity at the liquid temperature. CONSTITUTION: A substrate glass composition comprises SiO2 51.0 to 63.0 weight percent, Al2O3 5.0 to 10.0 weight percent, Na2O 3.0 to 8.0 weight percent, K2O 4.0 to 9.0 weight percent, MgO 4.1 to 9.0 weight percent, CaO 0.5 to 2.9 weight percent, BaO 7.0 to 16.0 weight percent, SrO 1.9 weight percent or less, ZrO2 0.5 to 6.0 weight percent, SO3 1 weight percent or less, and Sb2O3 1 weight percent or less. The total content of Na2O and K2O is 8.0 to 13.0 weight percent, and the total content of MgO, CaO, BaO, and SrO is 18.0 to 25.0 weight percent.
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