Toughened (Tempered) Glass

Toughened (tempered) safety glass is a pre-stressed glass. Pre-stressing is achieved by thermal treatment. The production method consists of rapid heating followed by rapid cooling with a blast of cold air. In comparison to float glass, which produces sharp, dagger-like glass splinters when broken, this glass breaks into small, mostly round-edged glass crumbs. The danger of injury is thus greatly reduced. Toughened glass has the further advantages of increased bending and impact-resistant qualities and tolerance to temperature change (150 K temperature difference, and up to 300 °C compared with 40°C for annealed material. It is also unaffected by sub-zero temperatures).


Toughened (tempered) glass also has enhanced mechanical strength (up to five times stronger than ordinary glass), so it can be used in structural glazing systems. Alterations to, and work on, toughened glass is not possible after production. Even slight damage to the surface results in destruction. However, tempered safety glass can be used in conventional double-glazing units.

Normal maximum sizes of glazing units using toughened glass

Normal maximum sizes of glazing units using toughened glass

Toughened (tempered) glass can be use in these areas : sports buildings (ball impact resistant); school and playschool buildings because of safety considerations; living and administration buildings for stairways, doors and partitions; near radiators to avoid thermal cracking; for fully glazed facades. and elements such as glazed parapets and balustrades on balconies and staircases to prevent falls.


Base on Architects’ Data by Ernst and Peter Neufert

1 Comment

  • admin December 29, 2018 at 2:06 pm

    Thank you


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