|Monthly Tech-Tip |
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Talc bodies have been universal for decades. Talc has been an essential ingredient to raise the coefficient of thermal expansion (COE) of bodies to fit commercial glazes. Through time, the glaze and body manufacturers have zeroed in on a "COE target" that they can comfortably meet. In view on the situation with talc supply and litigation climate around its use, body makers are seeking a way to avoid it. Talc is a magnesium silicate and its COE reduction mechanism is thought to be as a catalyst to the growth of cristobalite during kiln cooling. The action of dolomite, one of the most common, inert and inexpensive of all minerals, appears to do the same. And in much lower percentages. This mug is made from a recipe that replaces the 50% talc with 15% dolomite and 35% nepheline syenite (the remainder being white ball clay). This body looks very promising, being better in almost every aspect.
|Materials||Natural Talc C-98|
|Materials||Pioneer 2661 Talc|
Low Fire White Talc Casting Body Recipe
The classic white ball clay talc casting and modelling recipe has been used for many years. It is a dream to use as long as you are aware of the problems and risks.
Talc Hazards Overview
Talc is invaluable in the ceramics industry, it is used as a glaze and body ingredient and as a parting a release agent in various processes. Is it safe?