Tempered Glass

The tempering process includes heating and cooling stages to impart compressive stress to the outer surfaces of the glass on a horizontal line and an indirect tensile stress to the middle of the glass. Fully tempered glass is approximately 5 times more durable than untreated glass; It is suitable for use as safety glass as it shatters into dice-sized pieces when broken, reducing the risk of injury.

Semi-tempering process is also applied to glass using different cooling stages. Semi-tempered glass is approximately twice as durable as untreated glass and is not classified as safety glass.

After the tempering process, cutting, drilling, edge and surface treatment cannot be done on the glass (except sandblasting).

"Tempering traces", which can only be noticed from certain viewing angles and day light conditions, and distortions resulting from "general and regional curving" and "edge curving" are inevitable and unavoidable consequences of heat treatment, provided that they remain within the tolerances specified in the relevant standard. Marks that are minimized by applying a sensitive temperature regime during the tempering process are not considered a defect in themselves. It is recommended that the tracks be parallel to the ground.

There is a possibility of spontaneous breakage in fully tempered glass due to microscopic Nickel Sulfide particles that can be found in the architectural glass panel. To reduce this risk, fully tempered glasses can be pre-screened by passing a heat soak test, if required. However, this test can not completely eliminate the risk of spontaneous breakage, it only reduces it.