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Designed to resist thermal stresses, heat-strengthened glass is a flat glass product which has undergone heat-treatment, heating the glass to approximately 1,112⁰ F (600⁰C) and then cooled using jets of air. In this case, the cooling process is slower than it is for tempered glass. The surface of the glass is then locked in a state of compression, and while significantly stronger than annealed is not considered a safety glass. When broken, heat-strengthened glass splits into large sharp pieces like float glass.