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These test bars are fired at cone 10 reduction (top) and 10, 9 and 8 oxidation (downward). Consider a reason why one should reconcile actual physical working properties with measured test data. These two kaolins had almost the same drying shrinkages in SHAB this test, which suggests the same plasticity. And the EPK fires whiter. So it should make a better plastic porcelain, right? Not so. In reality #6 Tile is far, far more plastic. Something else to note: EPK will require more feldspar since it fires less vitreous. And, although both have extremely high firing shrinkages, the EPK is much higher. The charts for each show data for five separate test bars prepared, they show the drying shrinkage, firing shrinkage and porosity (water absorption).
Materials |
EP Kaolin
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Materials |
Tile #6 Kaolin
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Glossary |
Physical Testing
In ceramics, glazes and bodies have a chemistry, a mineralogy and a physical presence. All of these need to be understood to adjust and fix issues. |
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