Toughened Glass is made by processing normal annealed glass. The glass is subjected to heat till its softening point & then rapidly cooled in a controlled atmosphere. A fully tempered glass is 4 to 5 times stronger than a normal annealed glass of similar thickness & size A fully tempered glass is considered as a safety glass as it will disintegrate into small & blunt pieces when broken therefore reducing the probability & degree of injuries. Tempered glasses can also withstand high temperature differentials as compared to non tempered glass thereby reducing thermal breakage Toughening process does not change the light transmission and solar prosperities of the glass. However tempered glass cannot be cut or altered. Therefore it is made as per the requirement of the customer and all cutting grinding holes cutouts etc has to be done before the tempering process.