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This unbelievable body is made from dolomite, 65% of it. There is 35% ball clay to give it workability and 5% Ferro frit 3110. The frit stabilizes it so that the fired body does not rehydrate. This has a porosity of 35%! And that porosity is stable across the entire range we have fired it at (cone 06-6). The single-layer on the lower portion has been completely absorbed, the double-layer on the upper is almost gone.
Glossary |
Clay Body Porosity
In ceramics, porosity is considered an indication of density, and therefore strength and durability. Porosity is measured by the weight increase when boiled in water. |
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Materials |
Dolomite
An inexpensive source of MgO and CaO for ceramic glazes, also a highly refractory material when fired in the absence of reactant fluxes. |
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