Ask Pilkington


Ask Pilkington

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. ( )

Was this helpful?
Thank you for your feedback.
We're sorry to hear that, please refine your search and try again.

We value your privacy.

We use cookies on this website for analytics, remarketing, social media (optional) and content (essential) purposes.

By clicking ‘Accept All’ you consent to the use of cookies for non-essential functions and the related processing of personal data. Alternatively you can reject non-essential cookies by clicking ‘Essential Only’. You can adjust your preferences at any time by visiting our Cookie Policy and access the settings on that page.

For more information please read our