Patent ID: 9290413
Filing Date: 2016-03-22
CPC Classification: C03C,Y10T

Claim Text:
1. A glass article having a surface and a layer under compressive stress extending from the surface to a depth of layer wherein the compressive stress CS is at least about 900 Mpa and the depth of layer DOL is at least about 30 μm, wherein the glass article comprises: at least about 50 mol % SiO from about 7 mol % to about 26 mol % Al from about 11 mol % to about 25 mol % Na from 0 mol % to about 9 mol % B from 0 mol % to 2.5 mol % K from 0 mol % to about 8.5 mol % MgO; and from 0 mol % to 1.5 mol % CaO; wherein the glass article exhibits a CS criterion defined by the equation −340+27.1*Al