The strength of glass panels is critical for the performance of touch-screen displays, especially in regards to how it responds to impact or drop. Insufficient drop testing performance can be related to two parameters: fracture strength and flaw size. The fracture strength of touch screen panels, everything else being equal, is primarily driven by the degree of strengthening performed on the surface of the glass. Glass of less than 1/8th inch thickness for touch screen panel applications tends to require a chemical strengthening process as thermal quenching can induce warpage in these thinner glass sheets. Chemical strengthening is performed through an ion-exchange mechanism, typically in a potassium-based solution. The larger potassium ion (r+ = 0.133 nm) substitutes for the smaller sodium ion (r+ = 0.098 nm), inducing a volumetric increase and creating residual compressive stresses at the outer layer of the glass (see Figure 1).