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The tempering process creates
tension in the glass. This is achieved by faster cooling the
surface of the glass compared to the core of the glass.
This causes compressive stresses to build up in the areas
close to the surface and tensile stresses inside the glass.
Compressive and tensile stresses are negated reciprocally,
which means that flatness and stability of the glass and a
fracture pattern corresponding to the standard are guaranteed
in case of being destroyed.
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