Talc – this is a natural mineral and rock formation crystalized by this mineral. This industrial finely ground raw material used in various industries primarily as a filler. Finally, talc is a cosmetic powder, the most widely used in everyday life.The mineral talc is hydro-cilicate of magnesium which has chemical formula Mg3[Si4O10][OH]2. Talc is the softest mineral (1 hardness on the Mohs scale).
Talc has no odor, and is practically insoluble in water. It has slightly diluted solutions of acids and alkalis. It is neither explosive nor flammable substance. Talc is close to some organic substances and therefore mineral organophilic. Organophilic properties of talc aid good crystallization of polypropylene, attracting particles of organic resins in paper production, absorption capacity in the perfumery and cosmetic products.Crystal cell structure of talc is formed by a layer of magnesium oxide, framed by two layers of nonpolar tetrahedron of quartz and oxygen. Outer surface of flakes contains no hydroxyl groups or active ions, which leads to high chemical resistance and hydrophobicity of talc.Three-layer crystals of talc having very strong internal connections, are bonded with each other very weakly. This determines many of the physical and mechanical properties of talc: softness, viscosity, lubricity, adhesion, easy fission and grindability.