Corning Incorporated
GLASS COMPOSITIONS WITH IMPROVED CHEMICAL AND MECHANICAL DURABILITY

Abstract:

The embodiments described herein relate to chemically and mechanically durable glass compositions and glass articles formed from the same. In embodiments, the glass composition may include 74-78 mol. % SiO.sub.2; X mol. % Al.sub.2O.sub.3, wherein X is 5-7; alkaline earth oxide comprising MgO and CaO, wherein: CaO is 0.1-1.0 mol. %; MgO is 4-7 mol. %; and a ratio (CaO (mol. %)/(CaO (mol. %)+MgO (mol. %)) is less than or equal to 0.5. The glass composition may further include Y mol. % alkali oxide, wherein the alkali oxide comprises 9-13 mol. % Na.sub.2O and less than or equal to 0.4 mol. % of a fining agent. The glass composition may be free of boron and compounds of boron.