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Grog - 200 Mesh

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Grog - 200 Mesh 

Mulcoa Grog is clay which has been fired then ground up. Grog can come in many particle sizes, from fine to coarse. It is used to reduce shrinkage in clay bodies. The best size of grog for trying to maintain a smooth surface to your clay, but still get some of the anti-shrinking and warping benefits of grog is the ultra-fine 200 mesh.
This means that the grog is small enough to go through a screen with 200 openings per inch, but is to large to go through a screen with say 100 openings per inch. Commercially available grog almost always has some iron in it and may not be suitable if you want a pure white clay body. For throwing or hand building, grog in a clay body reduces the shrinkage and makes it less likely that a piece will crack during drying and firing.  For White Porcelain Grog, see molochite.

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