What is

TOUGHENED GLASS ?

Tempering of glass is a process by which the impact strength of annealed glass is increased by 4 to 5 times. The process involves heating of the glass to near about melting point ( ie 650 degree Celcius) and subsequent quenching. The sudden temperature difference puts the glass into a state of compression with the centre core in tension. Tempered glass gains its added strength from these compressed surfaces.