Glass is tempered by taking annealed glass and heating it to softening point of approximately 660 degree C. Its structure is then rapidly cooled while the inner core is allowed to cool gradually. This results in layer of high compression on the surface counter balancing by high tension at the center resulting in a glass that is four to five times stronger than annealed glass. Should accidental breakage occur, the resulting fragments are smaller and granular, causing no injury, harmless.
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Poonamale High Road, Chennai, Tamil Nadu