| 摘要 |
An alkali-free glass substrate that is substantially free from any alkali metal oxide, has a chemical resistance and a high strain point, is excellent in meltability and moldability, has a density of at most 2.6 g/cm<3>, and comprises on the weight basis 50.0 to 57.9 % SiO2, 10.0 to 25.0 % Al2O3, 3.0 to 12.0 % B2O3, 0 to 2.0 % MgO, 0 to 10.0 % CaO, 0.1 to 5.0 % BaO, 0.1 to 15.0 % SrO, 0 to 5.0 % ZnO, 0 to 5.0 % ZrO2, and 0 to 5.0 % TiO2.
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