Tempered glass, sometimes known as toughened glass is manufactured by thermal treatment involving carefully controlled heating and rapid controlled cooling.

The thermal treatment is designed to increase the surface compressive in the glass which increases the bending strength of the glass by a factor of 4-5.

When tempered glass is broken it shatters into relatively harmless dice.

Tempered glass is therefore deemed to be a safety glass product for use in architecture such as frameless glazing systems, transport and household furniture.