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Christy Minerals Grog

Calcined flint grog

Alternate Names: MCF Grog

Many sizes are available.
The MCF designation refers to Missouri Calcined Fireclay. The company sells the raw fireclay and many calcined products made from it.


Various grogs available in North America

Various grogs available in North America

Examples of various sized grogs from CE Minerals, Christy Minerals, Plainsman Clays. Grogs are added to clays, especially those used for sculpture, hand building and industrial products like brick and pipe (to improve drying properties). The grog reduces the drying shrinkage and individual particles terminate micro-cracks as they develop (larger grogs are more effective at the latter, smaller at the former). Grogs having a narrower range of particle sizes (vs. ones with a wide range of sizes) are often the most effective additions. Grogs having a thermal expansion close to that of the fired body, a low porosity, lighter color and minimal iron contamination are the most sought after (and the most expensive).

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By Tony Hansen

XML for Import into INSIGHT

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