Heat Strengthened Glass

Heat Strengthened Glass is produced through a process similar to that of tempered glass, with one key difference — the cooling phase is carried out at a slower rate. While both types of glass are heated to the same temperature, the rate of cooling determines the level of stress developed within the glass.

Because of this slower cooling process, heat strengthened glass develops lower residual stress compared to fully tempered glass. The result is a product that is approximately twice as strong as annealed glass, offering improved mechanical and thermal strength.

Unlike tempered glass, however, heat strengthened glass does not crumble into small cuboid fragments when broken. Instead, it breaks into sharp pieces, similar to ordinary annealed glass. Therefore, it is not suitable for safety glazing applications, but ideal where increased strength and stability are required.

Another key advantage of heat strengthened glass is its flatter surface and reduced optical distortion compared to fully tempered glass, making it suitable for applications demanding high optical quality.