Talc

Talc, Steatite and Soapstone are terms used in the trade for the same material. The chemical name for talc is Magnesium Silicate. In the ground form, steatite has a large variety of industrial applications. The value of industrial talc lies in its extreme softness, smoothness, slip and lubricating properties, high luster and sheen, chemical inertness, high fusion point, low conductivity to heat and electricity, and hiding power as a pigment extender.

Technical Details for Talc
Sr. No. Element Typical
1. Loss on Ignition 4% to 6%
2. Loss on Drying 0.05% to 0.5%
3. Acid soluble substances(AsSO4) 2 to 2.5%
4. Extractable fluoride 20%
5. pH as 10% 8.5% to 9.5%
6. Soluble Salts 0.2%
7. Absorption in Oil 30% to 35%
8. Asbestos Fibers Nil
9. Arsenic Nil
10. SiO4 61 to 65
11. MgO 29 to 32
12. Fe2O3 0.15
13. CaO 0.375
14. Al2O3 0.6% to 1.55%