Tempered safety glass (ESG)
Heat-treated single-pane safety glass that breaks into small, blunt fragments instead of large shards.
Tempered safety glass (German: ESG, Einscheibensicherheitsglas) is the standard glass for shower enclosures. It is heated to ~620 °C and then cooled rapidly, giving it 4–5× the strength of normal glass. On breakage it disintegrates into small blunt cubes — much safer than normal glass shards. By European standard EN 12150, all shower enclosure glass must be ESG.
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