Talc (Talcum; Soapstone; Steatite). HSN: 25261010
CAS: 14807-96-6. Mg3Si4O10(OH)2 or 3MgO 4SiO2 HOH.
A natural hydrous magnesium silicate. Compact, massive varieties may be called steatite in distinction from the foliated varieties, which are called talc. Soapstone is an impure variety of steatite.
Properties: White, apple green, gray powder; luster pearly or greasy, feel greasy, Mohs hardness 1-1.5 (maybe harder when impure), high resistance to acids, alkalies, and heat; d 2.7-2.8.
Grade: Crude, washed, air-floated, USP, fibrous (99.5%, 99.95%).
Hazard: Toxic by inhalation.
Use : Ceramics; cosmetics and pharmaceuticals; filler in rubber, paints, soap, putty, plaster, oilcloth; adherent; dusting agent; lubricant; paper; slate pencils and crayons; electrical insulation. See also magnesium silicate.
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