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Talc is a composed of with the chemical formula 23(3)4 or 3410()2. In loose form, it is the widely used substance known as .
It is and very soft, with a of 1,it has a of 2.52.8, a clear or dusty , and is translucent to opaque. Talc is not soluble in water, but it is slightly soluble in dilute . Its colour ranges from to or and it has a distinctly greasy feel.
It is used for paper-making, ceramics, plastic, rubber, textile, pharmaceutical, agricultural insecticides, cosmetic, leather, insulating material and many other industries. Natural lumps can be used in making slate pencils and carvings etc.
Item | SiO2 ≥ | MgO ≥ | Fe2O3 ≤ | CaO ≤ | Ig Loss ≤ | Whiteness ≥ | Size | Passing rate |
1 | 60% | 30% | 0.3% | 0.5% | 8% | 90% | 400mesh | 99% |
2 | 57% | 27% | 0.3% | 0.7% | 12% | 90% | 325mesh | 98% |
3 | 35% | 24% | 0.5% | 1.2% | 24% | 90% | 325mesh | 98% |
4 | 60% | 30% | 0.3% | 0.5% | 7% | 95% | 1250mesh | 100% |
5 | 60% | 30% | 0.3% | 0.5% | 7% | 95% | 2500mesh | 100% |
6 | 60% | 30% | 0.3% | 0.5% | 7% | 95% | 3um | 100% |
7 | 60% | 30% | 0.3% | 0.5% | 7% | 96% | 2um | 100% |
