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| Content | Calcium superphosphate | |||
| Best | Class A | Qualified 1 | Qualified 2 | |
| P2O5 | ≥18% | ≥16% | ≥14% | ≥12% |
| Free acid | ≤5% | ≤5.5% | ≤5.5% | ≤5.5% |
| H2O | ≤12% | ≤14% | ≤14% | ≤15% |
| Content | Triple superphosphate | ||
| Best | Class A | Qualified | |
| P2O5 | ≥ 47% | ≥ 44% | ≥ 40% |
| Free acid | ≤4.5% | ≤5% | ≤5% |
| H2O | ≤3.5% | ≤4% | ≤5% |
Calcium superphosphate