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Chemical composition of pure kaolin.
| Constituent/ignition LOI | Percentage |
|---|---|
| Aluminum oxide (Al2O2) | 37–39 |
| Silica oxide (SiO2) | 45–47 |
| Ferric oxide (Fe2O3) | 0.4–0.5 |
| Titanium oxide (TiO2) | 1.9–2.1 |
| Calcium oxide (CaO) | 0.4–0.7 |
| Sodium oxide (Na2O) | 0.6–0.7 |
| Potash (K2O) | 0.02–0.1 |
| Loss in Ignition LOI | 12–14 |
By Gamiz et al. (15).
