Bloating
Bubbling that occurs in clay bodies if they are over fired. Aggravating conditions include the presence of mineral particles that generate gases during the over firing stage, the presence of excessive carbon not burned away by bisquit or oxidation firing, laminations in the clay matrix, the presence of an early melting glaze that seals the surface preventing gas escape. Many bodies do not tolerate overfiring well (e.g. manganese speckled bodies, heavy iron stonewares). Many kilns do not have reliable shut-offs or the temperature measurement devices on computer controlled kilns have deteriorated or are not accurate and users are unwittingly firing them too high. It is best to confirm firing temperature using properly set cones to avoid bloating with touchy bodies. Out Bound Links
In Bound Links
- (Glossary)
Warping
Normally refers to a body problem where vessels wa... - (Glossary)
Stoneware
A high fired (about 1150C+) ceramic clay that is s... - (Troubles)
Body Bloating
- UnDescribed
- (Glossary)
Porosity
In ceramic testing this term generally refers to t...
Pictures
An example of a body being fired from cone 5 to cone 8. At cone 6 bloating begins to occur.
Bloating in an over fired terra cotta body. It is OK at cone 4 but suddenly bloating begins at cone 5.
Cone 6 iron bodies that fire light brown or red in oxidation can be dark brown or melting and bloated chocolate brown in reduction (Plainsman M350 (right) and M2).
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