Temepered Glass Inset Cover Parts for refrigerator 

The heat treatment process involves a tempering oven where the glass is heated to more than 600-620 degrees Celsius. After heating, it goes through ‘quenching’ which is the opposite of the first process. The glass is cooled through a high-pressure air that’s blasted to the surface of the glass from different nozzles.  This cool-down process makes its outer surface go into compression, while its center remains in tension. Glasses that are in tension, like annealed glass, are more breakable than those in compression.  Though commonly mistaken as the ‘unbreakable glass’, tempered glass still is breakable. But with a standard surface compression of 10,000 psi, tempered glass breaks on a high 24,000 psi tension, compared to an ordinary glass’ low 6,000 psi. It also withstands moderate heat for about 470 degrees celsius, but not recommended for wood burning applications.