Alkali-free glass substrate
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United States of America Patent
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Dec 22, 1998
Grant Date -
N/A
app pub date -
May 23, 1997
filing date -
Sep 28, 1995
priority date (Note) -
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Abstract
In order to provide an alkali-free glass substrate which contains substantially no alkali metal oxide, which has chemical resistance, a high strain point, excellent meltability, and devitrification resistance, the alkali-free glass substrate contains substantially no alkali metal oxide and essentially consists, by weight, of 58.0-68.0% SiO.sub.2, 10.0-25.0% Al.sub.2 O.sub.3, 3.0-15.0% B.sub.2 O.sub.3, 0-2.9% MgO, 0-8.0% CaO, 0.1-5.0% BaO, 0.1-10.0% SrO, 0-5.0% ZnO, 0-5.0% ZrO.sub.2, and 0-5.0% TiO.sub.2.
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