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These plastic terra cotta clay bars are fired, from bottom to top, at cone 2, 6, 8 and 10. As part of the melting process, the gases produced, as carbon-containing materials decompose, produce bubbles. This terra cotta vitrifies to stoneware density at cone 2 (bottom bar), it is even maintaining good red coloration. But by cone 3 it turns brown and by 4 begins to melt and expand. By cone 6 (second from bottom), it has turned into an Aero chocolate bar inside!
Glossary |
Decomposition
In ceramic manufacture, knowing about the how and when materials decompose during firing is important in production troubleshooting and optimization |
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