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That has put it under more compression on the inside, it is pushing outwards. All it took was some hot coffee. That put it under even more compression and the mug "popped" to relieve the tension.
Glossary |
Glaze Compression
In ceramics, glazes are under compression when they have a lower thermal expansion than the body. A little compression strengthens ware, too much can weaken and even fracture it. |
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