Body, clay body
A typical stoneware or porcelain body is mixture of raw and/or refined clays with possible additions of silica as a filler and thermal expansion increaser and feldspar as a flux. In vitrified bodies the larger grains of quartz and other refractory particles remain unmelted while the clays go into solution in the feldspar glass and transform into mineral forms that impart rigidity to the mass. Non-vitreous bodies have strength by virtue of whatever particle bonding has been accomplished by melting fluxes in the mix. Earthenware bodies develop much less or even no glass bonding and depend more on sinter-bonding.
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