Used as anti-caking agent in food, filler in pharmaceuticals, adsorbent in cosmetics, and in paints, rubber, and electronics for reinforcement; also in water filtration and chromatography.

May cause silicosis from chronic inhalation; irritates eyes and skin. California Prop 65 cancer warning; avoid dust formation. Stable but releases silicon oxides in fires; Hazard Class varies.

In 25kg bags; store dry; dispose in sanitary landfills or incinerate with scrubbing.