Tempered Glass

Tempered glass is a kind of safety glass. The original glass is thermally processed to enhance its strength, a stronger and safer glass form that is often needed for most applications is created by this way. Tempering process is a process where glass is heated to 600 °C - 650 °C by means of special heating systems specific for this process and is suddenly cooled by air cooling.


As a result of the tempering process, compression tension (compression) is applied to the outer surfaces of the glass and an indirect tensile stress (tension) is given in the middle of the glass. Thus, the glass becomes resistant to pulling and impacts.


It is produced in the same furnace with full tempered glass. The surface tension is low since it is less cooled. Its resistance strength is half the tempered glass. The Heat Soak test is not applied because the risk of spontaneous breakage is low. When broken, it is shattered into larger pieces than full tempered glass.



Tempered glasses are rested at 290 °C for 2 hours. (The glass should be rested for 2 hours after reaching 290 °C). During this furnace phase, in case nickel sulphide particle is present, the phase change is accelerated, and the shattering occurs. In case the glass passed the test, there is no nickel sulphite particle in the glass, or is in trace amount that there is no risk.

Tempered glasses are heated in furnaces of approximately 290 °C in accordance with EN 14179 - ‘’Glass in building - Heat soaked thermally toughened soda lime silicate safety glass’’ The shattered glass is eliminated in this way.



Cambered glass process is the process of bending the glass heated slowly until it reaches the melting point, with a certain air pressure in the cooling furnace, according to the desired radius. It can also be used as cambered laminated or insulating glass.



  • While normal glasses can be shattered into sharp particles after breakage and cause injury, tempered glasses break into small and non-sharp pieces in case of breakage. Therefore, the risk of injury is minimized.
  • It is 4-5 times more durable compared the original glass.
  • It has good thermal stability and can withstand temperature differences.
  • While the tempered glass can withstand a thermal shock of 300 °C, the non-tempered glass can be broken when subjected to thermal shock of about 40 °C.
  • It also increases the resistance to thermal shock and can withstand temperature changes up to 150 ~ 200 °C.
  • After the glasses become a tempered glass, cutting, grinding and metal cutting operations cannot be performed. Heat treatment does not change the volume, color, clarity and chemical structure of glass.