Glass Articles with Improved Chemical and Mechanical Durability
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Oct 25, 2012
filing date -
Oct 25, 2011
priority date (Note) -
Abandoned
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Abstract
A glass article may formed from a glass composition that may include from about 70 mol. % to about 78 mol. % SiO2, from about 3 mol. % to about 13 mol. % alkaline earth oxide, X mol. % Al2O3, and Y mol. % alkali oxide. The alkali oxide may include Na2O in an amount greater than or equal to about 9 mol. % and less than or equal to about 15 mol. %. The ratio of Y:X may be greater than 1. The glass article may be free of boron and compounds of boron. The glass article may have a compressive stress layer with a compressive stress greater than or equal to about 250 MPa and depth of layer greater than or equal to about 25 μm. The glass article may have at least a type HGA2 hydrolytic resistance according to the ISO 720 standard.
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