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Chemical composition of OPC.
| Oxide Components | Percentage (%) |
|---|---|
| Silicon | 20.18 |
| Aluminium | 4.65 |
| Ferrous | 3.59 |
| Calcium | 62.59 |
| Magnesium | 1.56 |
| Sulphur | 2.67 |
| Sodium | 0.23 |
| Potassium | 0.74 |
| Chloride | 0.03 |
| Free calcium | 1.21 |
| Loss of ignition | 1.23 |
| Insoluble residue | 1.32 |
