Gorilla Glass is the registered trademark for an alkali-aluminosilicate sheet toughened glass manufactured by U.S. glassmaker Corning Inc. Engineered for a combination of thinness, lightness, and damage-resistance, it is used primarily as the cover glass for portable electronic devices including mobile phones, portable media players, laptop computer displays, and some television screens.
It is manufactured through immersion in a molten alkaline salt bath using ion exchange to produce compressive residual stressat the surface. This prevents cracks from propagating – for a crack to start, it will first have to overcome this compressive stress.
Manufacture During its manufacture, Gorilla Glass is toughened by ion exchange. The material is submersed in molten potassium salt at a temperature of approximately 400 °C (750 °F), whereby smaller sodium ions leave the glass to be replaced by larger potassium ions from the salt bath. The larger ions occupy more space and are pressed together when the glass cools, causing potassium ions to diffuse far into the surface, thereby creating a 'surface' layer of high compressive stress deep into the glass, a layer more resistant to damage from everyday use.
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