Glossary of Industry Terms

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Kaolin (china clay)

A refractory clay consisting essentially of minerals of the kaolin group and which fires to a white or nearly white color. (ASTM C 242).

Keene’s cement

A cement composed of finely ground, anhydrous, calcined gypsum, the set of which is accelerated by the addition of other materials.

Knockings

The oversize residue obtained in screening a ceramic slip. (ASTM C 242).

Kyanite (Al2 03 ‘ Si 02

The most abundant of the mineral polymorphs that include andalusite and sillimanite. Kyanite is used as a source of mullite in ceramics. (ASTM C 21)