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Composition of rice husk ash (Ramadhansyah et al. 2012)
| Oxide compounds | Chemical composition (%) |
|---|---|
| Silicon dioxide (SiO2) | 93.0 |
| Aluminum oxide (Al2O3) | 0.20 |
| Iron oxide (Fe2O3) | 0.13 |
| Calcium oxide (CaO) | 0.49 |
| Magnesium oxide (MgO) | 0.73 |
| Sodium oxide (Na2O) | 0.02 |
| Potassium oxide (K2O) | 1.30 |
| Sulfur trioxide (SO3) | 0.15 |
| Loss on ignition (LOI) | 3.98 |
