Description
Talc, with the chemical formula Mg3Si4O10(OH)2, is a naturally occurring mineral composed of hydrated magnesium silicate. It is known for its softness (1 on the Mohs hardness scale), whiteness, and ability to absorb moisture and reduce friction. These properties make it highly versatile and useful in many industries.
Physical and Chemical Properties
| Property | Value |
| Physical State | Solid (powder) |
| Melting Point | > 1500°C |
| Solubility in Water | Insoluble |
| pH (in slurry) | 7 – 9 |
| Density | ~2.7 – 2.8 g/cm³ |
| Hardness (Mohs scale) | 1 (very soft) |
| Flammability | Non-flammable |
Common uses include:
Cosmetics and Personal Care: Widely known as the main ingredient in talcum and baby powder to absorb moisture, prevent chafing, and provide a smooth feel. It is also used as a base and filler in various makeup products.
Industrial Applications:
Plastics and Rubber: Used as a filler to improve stiffness, heat resistance, and dimensional stability. It also acts as an anti-sticking agent.
Paints and Coatings: Serves as an extender and matting agent, improving opacity and smoothness.
Paper: Used as a filler to enhance brightness, opacity, and smoothness.
Ceramics: Acts as a flux to lower firing temperatures and improve the strength and durability of ceramic products.
Other Applications:
Pharmaceuticals: Used as a glidant to assist with the flow of tablet ingredients during manufacturing.
Food: Used as an anti-caking agent (E553b in the EU).
Agriculture: Used as a carrier for insecticides and pesticides.
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