Kaolin (china clay) is a hydrated aluminum silicate crystalline mineral (kaolinite) formed over many millions of years by the hydrothermal decomposition of granite rocks. Hydrous kaolin is characterized by its fine particle size, plate like or lamellar particle shape and chemical inertness.
Specifications of China clay powder
| Particulars | Description |
|---|---|
Whiteness as compared with MgO scale | 80.2 |
Bulk Density | 0.4 – 0.5 gm/m |
Specific Gravity | 2.54 |
Moisture Content | 0.05 |
Loss on Ignition | 14.11 |
Oil Absorption | 55.00 |
PH of 10% Solution | 8 – 9 |
Silica as SiO2 | 45 – 46% |
Alumina as Al2O3 | 34 – 37 |
Magnesium as MgO | 0.60 |
Iron as Fe2O3 | 0.83 |
Fineness Passing through 700 Mesh B. S. Sieve | 1.5 |
Applications:
China Clay is most widely used as filler/Extender in many industrial namely :
- Paints
- Rubber
- Pharmaceutical
- Toothpaste
- Detergents
- Glazed-tiles
- Paper coating
- Shoe Polish