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Shatter pattern of toughened glas, 1968.

Shatter pattern of toughened glas, 1968.
4 0 c m
actual image size: 31cm x 32cm


Toughened glas is safety glas formed by putting the surface into a state of compresion. There are two ways of doing this. Thermal toughening chills the surface, which is close to the softening point, with air jets. Chemical toughening exchanges sodium ions in the surface with larger ones thereby setting up internal streses.

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© Science Museum / Science & Society Picture Library

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