Corning Incorporated
Alkaline earth alumino-silicate glass compositions with improved chemical and mechanical durability

Abstract:

According to one embodiment, a glass composition may include from 67 mol. % to about 75 mol. % SiO.sub.2; from about 6 mol. % to about 10 mol. % Al.sub.2O.sub.3; and from about 5 mol. % to about 12 mol. % alkali oxide. The alkali oxide may include K.sub.2O in an amount less than or equal to 0.5 mol. %. The glass composition may further include from about 9 mol. % to about 15 mol. % of alkaline earth oxide. The alkaline earth oxide may include greater than about 0 mol. % and less than or equal to 3 mol. % MgO, from 2 mol. % to about 7 mol % CaO, at least one of SrO and BaO. The glass composition may further include less than 1 mol. % B.sub.2O.sub.3. A ratio of a concentration of MgO to the sum of the concentration of divalent cations (MgO:.SIGMA.RO) may be less than 0.3.