Shatter pattern of toughened glas, 1968.
4 0 c m
 
39cm
actual image size: 31cm x 32cm

Shatter pattern of toughened glas, 1968.

© Science Museum / Science & Society Picture Library

Description

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.
 

Image Ref.

10220769
 

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