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| Composition | Rice husk ash/% | 500 °C sample/% (8%) | 600 °C sample/% (8%) | 700 °C sample/% (8%) | 600 °C sample/% (4%) |
|---|---|---|---|---|---|
| SiO2 | 96.203 | 99.546 | 99.538 | 99.542 | 99.431 |
| SO3 | 0.855 | 0.440 | 0.446 | 0.445 | 0.491 |
| Fe2O3 | 0.422 | 0.008 | 0.010 | 0.007 | 0.008 |
| MnO | 0.058 | 0.006 | 0.007 | 0.006 | 0.006 |
| CuO | 0.048 | — | — | — | — |
| Cr2O3 | 0.067 | — | — | — | — |
| ZnO | 0.020 | — | — | — | — |
| K2O | 1.510 | — | — | — | 0.050 |
| CaO | 0.797 | — | — | — | 0.013 |
| SiO2 purity% | — | 99.357 | 99.448 | 99.532 | 99.331 |
