Tempered Glass - Printable Version

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Tempered Glass - fdaforum - 08-14-2014

Tempered Glass

Is an extremely strong glass which has been thermally heat treated to induce compressive stresses of 11000 to 20000 psi on the surfaces and edge compression of not less than 9700 psi.

Tempering Process: Tempered glass is made on state-of-the-art, electrically heated horizontal furnaces, which heat the glass to a uniform temperature of approximately 700°C. Ceramic rolls convey the glass through the furnace at speeds regulated to ensure temperature uniformity and minimal optical distortions. When the glass exits from the furnace, it is rapidly cooled by a series of air nozzles. This rapid cooling puts the glass surface into a state of compression, with the center core in tension. In the Final Stress Distribution, the sum of the forces in compression equals the forces in tension.



Characteristics of Tempered Glass

1. Strength: Toughened (or Tempered Glass) is four to five times stronger than its equivalent thickness of normal annealed float or sheet glass.

2. High Thermal Shock Strength: Tempered Glass provides greater thermal strength. lt offers increased resistance to both sudden temperature changes and temperature differentials up to 250°C compared to normal annealed glass which can withstand temperature differentials up to 40°C only.

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