Toughening Process,

Involves heating and cooling treatment whereby high compressive stresses are set up at the surfaces with balancing tensile stresses in the centre. Improves the glass strength against impact and thermal stress loads. Keeps the original volume, chemical composition, colour and clarity of the glass.

Tempered glass is approximately 5 times stronger than annealed glass against impact.

Tempered glass is appropriate for using as safety glass because it matters into small, blunt edged fragments, which reduce the risk of injury.

Certain “tempering patterns” which are only visible under some lighting conditions and distorisions within allowable bow & warp tolerances are normally accepted as an inherent and unavoidable characteristic of heat treatment and not a defect.


Minimum Size : 300 x 300 mm (for each thickness)