HEDP is an organic phosphoric acid scale and corrosion inhibitor, which can form stable complexes with iron, copper, zinc and other metal ions and dissolve oxides on metal surface. HEDP can still play a good role in corrosion and scale inhibition at 250 C. It is still stable at high pH value and difficult to hydrolyze. It is difficult to decompose under ordinary photothermal conditions. Acid and alkali resistance and chlorine oxidation resistance are better than other organic phosphoric acid (salt). HEDP can form hexacyclic chelate with metal ions in water, especially calcium ions, so HEDP has better scale inhibition effect and obvious solubility limit effect. When combined with other water treatment agents, HEDP shows an ideal synergistic effect.
HEDP solid belongs to high purity products, suitable for winter cold areas; especially suitable for cleaning agents and daily chemical additives in the electronics industry.
| Item | Standard | Result |
| Appearance | white crystal | white crystal |
| Active Component,% | ≥90.0 | 90.78 |
| Chloride,% | ≤100 | 16 |
| Ph Value(10g/L water solution) | 1.5-2.0 | 1.64 |
| Orthophosphate,% | ≤0.50 | 0.18 |
| Phosphorous Acid | ≤0.80 | 0.39 |
| Fe,mg/L | ≤10 | 4.14 |
Conclusion:PASS.
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