Grog - Grog is your friend. It adds "bones" to a clay body, allowing the artist to make larger, taller pieces, either thrown or hand built. It also aids in reducing crack propagation during the drying and firing process, especially when raku firing. Too much grog will, on the other hand, begin to reduce the plasticity of the body, as well as be abrasive on the hands during throwing.

Discontinued - Grog - Fine - 48M - Crushed and accurately sized cone 33 fired virgin firebrick. A common small particle size grog additive to a clay body. Good screen distribution, with a minimum of fines.

Grog - Fine - 35M - Calcined fireclay with a screen distribution more to the fine sizes. Minimum of actual 35M grog, high percentage of fines. Used in selected body formulations.

Grog - 20M Fireclay - Calcined Fireclay with an even screen distribution from 20M to -325M fines. A major grog ingredient in many clay bodies, in varying percentages.

Grog - 10M Fireclay- A quite coarse Calcined Fireclay, which may be useful in large sculptural work. Too coarse for a throwing body.

Grog - 4M - Very coarse calcined grog. Generally used in refractory castables, but has found uses in clay body formulations for massive sculptures.

Kyanite - 35M & 48M - A naturally occurring mineral of approximately 2/3 alumina and 1/3 silica. Will convert to Mullite at 2800F. In most clay bodies, it is an inert grog of high quality and consistency. The grog particle is not round, but elongated, allowing greater blending with the clay matrix to improve strength and thermal shock resistance. A gray colored particle.

Mullite - 35M, 48M & 200M - The white calcined form of Kyanite. A very high temperature, stable grog. More expensive than Kyanite.

Molochite - 30M, 50X80M, 120M - A very white porcelain grog used in white clay bodies.