Small toughened safety glass windows in discs squares and shapes for scientific, meter, instrumentation and industrial applications. Specialist toughened glass heat treated windows aremade tothe finished sizes then pre-stressing the glass by thermal toughening to BS standards.

Toughened glass is produced by subjecting annealed glass to a process of heating and rapid cooling which produces high compression in the surface and compensating tension in the centre.

When toughening it does not alter the light transmission and solar radiant heat properties of the glass. The properties of the toughened product are identical to those of the annealed glass used.

The mechanical strength can be increased to as much as four to five times that for its equivalent thickness of annealed glass.

The thermal strength greatly increases resistance to both sudden temperature changes and temperature differentials up to 250ºC.

Thickness ranges from 1mm (chemical toughening) to 25mm thick generally in float glass and borosilicate glasses.