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Phosphorous Acid, Crystal
| Item | Premium Grade | First Grade | Second Grade |
| Appearance | Pure White Crystal | White Crystal | White Crystal |
| Assay | 99.0%min | 99.0%min | 98.5%min |
| Iron (Fe) | 0.0001%max | 0.0005%max | 0.002%max |
| Chloride (C) | 0.0005%max | 0.0005%max | 0.002%max |
| Sulphate (SO4) | 0.0001%max | 0.0005%max | 0.002%max |
| Phosphate (PO4) | 0.05%max | 0.1%max | 0.2%max |
| Plumbum (Pb) | 0.0001%max | 0.0001%max | |
| Cadmium (Cd) | 0.0001%max | 0.0001%max | |
| The test of 70% concentration water solution |
Ftu0.1max | Ftu 1max | |
| Apha 3max | Apha 10max | ||
| Caution: second grade phosphorous acid is made from by-products of dimethyl phosphite. | |||