According to Wiki, ".It is used as a filtration aid, mild abrasive in products including metal polishes and toothpaste, mechanical insecticide, absorbent for liquids, matting agent for coatings, reinforcing filler in plastics and rubber, antiblock in plastic films, porous support for chemical catalysts, litter, activator in blood clotting studies, a stabilizing component of dynamite, and a thermal insulator."