| Item | Specification |
| Appearance | colorless to pale yellow liquid |
| Active as acid | 21.2-24.6% |
| Active as salts | 31.0-36.0% |
| Total phosphoric acid | 16.8% min |
| pH (1% solution) | 6.0-8.0 |
| Density @20 ℃ | 1.21-1.31g/cm3 |
| Iron (as Fe) | 35ppm max |
| Chloride (as Cl) | 4.0% max |
| Phosphorous acid | 2.0% max |
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