Talc is an important industrial mineral. It is an important filler material for paints, rubber, insecticides, cosmetics, plastics, paper, ceramic and pharma. It is Very fine white to grayish white odorless tasteless powder, insoluble in water but slightly soluble in dilute acids and its technical specification are as under:
Talc is a clay mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2. In loose form, it, along with corn starch, was one of the most widely used substances known as baby powder.
| 1. | Loss on Ignition | 5% |
|---|---|---|
| 2 | Loss on Drying | 0.05% |
| 3 | MgO | 29.5 |
| 4 | SiO2 | 61.5 |
| 5 | Fe2O3 | 2.56 |
| 6 | CaO | 0.56 |
| 7 | Soluble Salts | 0.2% |
| 8 | Al2O3 | 0.55% |
| 9 | Acid Soluble Substance | 2.5% |
| 10 | pH (at 10%) | 8.5 -9.5 |
| 11 | Arsenic | Nil |
| 12 | Asbestos fibres | Nil |
| 13 | Mesh | Nil |
| 14 | Brightness | 78% to 98% |
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