|Monthly Tech-Tip |
Texas talc contains carbon as CO2 in the dolomitic part of the ore (thus it is not detected as stand-alone talc in typical carbon burnoff testing). About 7% of the mass of the talc is expelled as gas. If you are single-firing glazed ware consider slowing the heating rate through this zone to allow for a more gentle gas evolution.
A source of MgO for ceramic glazes, a flux or thermal expansion additive in clay bodies, also used in the manufacture of cordierite.
|By Tony Hansen|
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