When clay materials and bodies bubble as they melt or over fire. This normally happens in raw materials that contain particulates that produce gases during firing.
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Bloating is a fault that can occur in the firing of glazed or unglazed porcelains, stonewares and earthenware clay bodies. Large or small bubbles/blisters on the surface indicate a firing rate or temperature that the body or material cannot tolerate. The principal home of information on this issue is in the troubleshooting section in the Bloating topic.
Bloating occurs when the off-gassing of decomposing particles in a body has not completed by the onset of density and impermeability associated with the vitrification process.
|By Tony Hansen
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