| 摘要 |
PCT No. PCT/JP96/02750 Sec. 371 Date May 23, 1997 Sec. 102(e) Date May 23, 1997 PCT Filed Sep. 25, 1996 PCT Pub. No. WO97/11919 PCT Pub. Date Apr. 3, 1997In order to provide an alkali-free glass substrate which contains substantially no alkali metal oxide, which has chemical resistance, a high strain point, and excellent meltability and formability, and which has a density of 2.6 g/cm3 or less, the alkali-free glass substrate contains substantially no alkali metal oxide and essentially consists, by weight, of 50.0-57.9% Sio2, 10.0-25.0% Al2O3, 3.0-12.0% B2O3, 0-2.0% MgO, 0-10.0% CaO, 0.1-5.0% BaO, 0.1-15.0% SrO, 0-5.0% ZnO, 0-5.0% ZrO2, and 0-5.0% TiO2.
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