Pilkington Toughened Glass is manufactured by subjecting final size, edge-worked panes of glass to a heating and cooling treatment whereby high compressive stresses are set up at the surfaces with balancing tensile stresses in the centre. The high compressive surface stresses give the Pilkington Toughened Glass its increased strength. When fractured, it tends to break into small, relatively harmless pieces, which means it can be used in many applications where a safety glass is required.

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