Corning Incorporated
Ion exchanged glass with high resistance to sharp contact failure and articles made therefrom

Abstract:

An article comprising an ion-exchanged glass material that prevents sharp contact flaws from entering a central region of the material that is under central tension and thus causing failure of the material. The glass material may be a glass or glass ceramic having a surface layer under compression. In some embodiments, the depth of the compressive layer is greater than about 75 .mu.m. The greater depth of layer prevents flaws from penetrating the compressive layer to the region under tension.