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How is distortion in toughened glass defined?

Due to the nature of the toughening process, glass will not be as flat as annealed glass and distortion is possible, including the following for horizontally toughened glass:

Overall bow - deformation of the whole pane of toughened glass caused by the heating and cooling process

Roller wave distortion – distortion produced in horizontally toughened glass as a result of the glass process being in contact with the rollers during the toughening process

Edge lift – distortion produced at the leading and trailing edge of the plate

EN 12150-1 sets requirements for distortion in toughened glass.

For more specific details, please refer to the standard, BS EN 12150-1: 2015: Glass in building – Thermally toughened soda lime silicate safety glass. (www.bsigroup.com )

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