Tempered glass is a type of safety glass. The original glass is thermally treated to increase its strength, creating a stronger and safer form of glass that is often required for many applications. The tempering process involves heating the glass to temperatures between 600°C and 650°C with special heating systems and then cooling it suddenly with air.
As a result of tempering, compressive stress (compression) is applied to the outer surfaces of the glass, while an indirect tensile stress (tension) is applied to the middle of the glass. Thus, the glass becomes resistant to pulling and impacts.
While normal glass breaks into sharp pieces and can cause injuries after breaking, tempered glass breaks into small, blunt pieces when broken. Therefore, the risk of injury is minimized.