Talc — Mg3Si4O10(OH)2 — a mineral, crystal substance. Represents friable powder of white (occasionally green) color greasy to the touch. Quality of talc is defined by its whiteness. For the industrial purposes use ground talc, microtalc etc.
Color from white to light green. A greasy luster, on cleavage planes nacreous. It is appeared through in the regions. Cleavage is very perfect. Talc was discovered by the scientist Michael Faraday. Has minimum (1-2 points) hardness on Moos's scale. Greasy to the touch.
Is a basic component of children's powders in this connection both names are often used as synonyms. It is used in life for prevention of friction of the adjoining surfaces (in rubber gloves, in footwear), and also for prevention of adhesion at long storage of different products from rubber. Contrary to a popular belief talc is not used in weightlifting, artistic gymnastics and mountaineering as it reduces friction. For improvement of coupling of hands in these disciplines athletes use magnesia — 4MgCO3*Mg (OH)2*4H2O.
As the filler is applied in rubber, paper, paint and varnish, medical (a basis of tablets), perfumery and cosmetic and other industries.
Important scope — ceramics (especially radio insulating).
In the food industry it is registered as a food additive of E553b.
Meets in additives to engine oils for increase in term of operation and protection of DVS.