Tempered glass is also referred to as “toughened” or “fully tempered” glass. It is heat-treated safety glass with a minimum surface compression of 10,000 psi or a minimum edge compression of 9,700 psi. The surface of tempered glass is approximately four times stronger than the surface of regular annealed (non-safety) glass of the same thickness.

　　When broken, tempered glass shatters into small, relatively harmless pieces. This characteristic “dice” break pattern minimizes the risk of serious injury.