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To gauge strength: Break pieces often. Pay attention to what happens.

This is M340 casting, L3798H. The handle was just glued on with slip. I had questions about this new body. Are my glazes under compression? How well is the handle stuck on? Because I have broken so many pieces I know how they break. It is a good sign when there are no fractures along the handle joins. And when the handle is the last to go. And when the item breaks into large pieces rather than shattering into small ones. Try doing this on some of your pieces and you might be surprised. Either by how strong they are. Or by how easily they break.

A broken slip cast cone 6 mug

Links

Glossary Fired Strength
Ceramics, by their brittle nature, have high compressive strength. But in functional ceramics we are more concerned about the tensile strength as this relates better to serviceability.
Glossary Glaze Compression
In ceramics, glazes are under compression when they have a lower thermal expansion that the body they are on. A little compression is good, alot is bad.
Glossary Restaurant Ware
If you are a potter and want to make restaurant ware, read this. Many of the things you already think you know will mislead you in this type of venture.

Monthly Tech-Tip from Tony Hansen

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