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Tempered glass is a flat glass product which has undergone heat-treatment, heating the glass to approximately 1,112⁰ F (600⁰C), then rapidly cooling the glass. This rapid cooling locks the surface of the glass in a state of compression. This makes it more resistant to mechanical and thermal stresses and gives it the required fragmentation characteristics.

Tempered glass is considered a safety glazing solution, and is produced to meet the criteria set forth in ANSI Z97.1 and CPSC 16 CFR 1201. Tempered glass is 4 to 5 times stronger than annealed float glass and upon impact breaks into small, blunt pieces minimizing risk of serious injury.