A refractory clay consisting essentially of minerals of the kaolin group and which fires to a white or nearly white color. (ASTM C 242).
A cement composed of finely ground, anhydrous, calcined gypsum, the set of which is accelerated by the addition of other materials.
The oversize residue obtained in screening a ceramic slip. (ASTM C 242).
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)