| Constituent | Corn cob ash (wt %) | After extraction (wt %) |
| SiO2 | 47.78 | 98.77 |
| Al2O3 | 9.40 | 0.00 |
| Fe2O3 | 8.31 | 0.00 |
| CaO | 16.70 | 0.00 |
| MgO | 7.80 | 0.00 |
| Mn2O3 | 2.70 | 0.00 |
| K2O | 5.42 | 0.74 |
| Na2O | 1.89 | 0.49 |