A hydrated aluminum silica.   Clayis a general term including many combinations of one or more clay minerals with traces of metal oxides and organic matter.  Clays are fine, irregualrly shaped crystals ranging from 150 microns to less than 1 micron (colloidal) and are reddish-brown to pale buff in color, depending on iron content.

Uses:    ceramic products; refractories; collodial suspensions; oil-well drilling fluids;  filler for rubber and plastic products; films; paper coating; decolorizing oils; temporay molds; filtration; carrier in insecticidal sprays; catalyst support.

Hazard:    Dusts may be irratating to the nose and throat.  Suspensions of dust are a fire hazard.