HEDP is an organophosphonic acid scale and corrosion inhibitor. It can form complexes with metal ions such as iron, copper and zinc, and dissolve oxides on metal surfaces. It maintains excellent scale‑inhibiting and corrosion‑inhibiting performance at 250 ℃. It remains stable under high‑pH conditions, resists hydrolysis, and hardly decomposes under ordinary light and thermal conditions. Its acid‑alkali resistance and chlorine‑oxidation resistance outperform other organophosphonic acids / salts. It forms six‑membered ring chelates with metal ions in water, especially calcium ions, delivering outstanding scale‑inhibiting effect and obvious threshold effect. Ideal synergistic effect can be achieved when compounded with other water treatment agents.
Alias: Hydroxyethylidene Diphosphonic Acid
Molecular Formula: C₂H₈O₇P₂
Relative Molecular Mass: 206.02
HEDP is an organophosphonic acid scale and corrosion inhibitor. It can form complexes with metal ions such as iron, copper and zinc, and dissolve oxides on metal surfaces. It maintains excellent scale‑inhibiting and corrosion‑inhibiting performance at 250 ℃. It remains stable under high‑pH conditions, resists hydrolysis, and hardly decomposes under ordinary light and thermal conditions. Its acid‑alkali resistance and chlorine‑oxidation resistance outperform other organophosphonic acids / salts. It forms six‑membered ring chelates with metal ions in water, especially calcium ions, delivering outstanding scale‑inhibiting effect and obvious threshold effect. Ideal synergistic effect can be achieved when compounded with other water treatment agents.
| Item | GB/T26324‑2010 | HG/T3537‑2010 | |
|---|---|---|---|
| Appearance | Colorless or pale‑yellow transparent liquid | Colorless or pale‑yellow transparent liquid | White crystal |
| Active Component (as HEDP) % ≥ | 50.0 | 60.0 | 89.0 |
| Phosphorous Acid (as PO₃³⁻) % ≤ | 2.0 | 2.0 | 0.80 |
| Phosphoric Acid (as PO₄³⁻) % ≤ | 0.8 | 0.8 | 0.50 |
| Chloride (as Cl⁻) % ≤ | 0.02 | 0.02 | 0.01 |
| pH (1% aqueous solution) | 1.5‑2.0 | ≤2.0 | ≤2.0 |
| Density (20℃) g/cm³ | 1.34 | 1.40 | ‑ |
| Calcium Chelating Value mg/g ≥ | 450 | 500 | ‑ |
| Iron (as Fe²⁺) mg/L ≤ | 10.0 | 10.0 | 5.0 |
For scale inhibition: typical dosage 1‑10 mg/L. For corrosion inhibition: typical dosage 10‑50 mg/L. For cleaning agent: typical dosage 1000‑2000 mg/L. It is normally used together with polycarboxylate scale‑dispersing agents. Dosage shall be determined by tests for other application scenarios.
Liquid product: packed in plastic drums, 30 kg or 250 kg per drum. Solid product: packed in plastic woven bags with inner polyethylene liner, 25 kg net weight per bag. Customized packages are available upon customer requirements. Store indoors in cool and well‑ventilated place, keep dry. Shelf life: 12 months.
HEDP is acidic. Take labor‑protection measures during operation. Avoid contact with skin and eyes. Rinse immediately with plenty of clean water in case of contact.
Alias: Hydroxyethylidene Diphosphonic Acid
Molecular Formula: C₂H₈O₇P₂
Relative Molecular Mass: 206.02
HEDP is an organophosphonic acid scale and corrosion inhibitor. It can form complexes with metal ions such as iron, copper and zinc, and dissolve oxides on metal surfaces. It maintains excellent scale‑inhibiting and corrosion‑inhibiting performance at 250 ℃. It remains stable under high‑pH conditions, resists hydrolysis, and hardly decomposes under ordinary light and thermal conditions. Its acid‑alkali resistance and chlorine‑oxidation resistance outperform other organophosphonic acids / salts. It forms six‑membered ring chelates with metal ions in water, especially calcium ions, delivering outstanding scale‑inhibiting effect and obvious threshold effect. Ideal synergistic effect can be achieved when compounded with other water treatment agents.
| Item | GB/T26324‑2010 | HG/T3537‑2010 | |
|---|---|---|---|
| Appearance | Colorless or pale‑yellow transparent liquid | Colorless or pale‑yellow transparent liquid | White crystal |
| Active Component (as HEDP) % ≥ | 50.0 | 60.0 | 89.0 |
| Phosphorous Acid (as PO₃³⁻) % ≤ | 2.0 | 2.0 | 0.80 |
| Phosphoric Acid (as PO₄³⁻) % ≤ | 0.8 | 0.8 | 0.50 |
| Chloride (as Cl⁻) % ≤ | 0.02 | 0.02 | 0.01 |
| pH (1% aqueous solution) | 1.5‑2.0 | ≤2.0 | ≤2.0 |
| Density (20℃) g/cm³ | 1.34 | 1.40 | ‑ |
| Calcium Chelating Value mg/g ≥ | 450 | 500 | ‑ |
| Iron (as Fe²⁺) mg/L ≤ | 10.0 | 10.0 | 5.0 |
For scale inhibition: typical dosage 1‑10 mg/L. For corrosion inhibition: typical dosage 10‑50 mg/L. For cleaning agent: typical dosage 1000‑2000 mg/L. It is normally used together with polycarboxylate scale‑dispersing agents. Dosage shall be determined by tests for other application scenarios.
Liquid product: packed in plastic drums, 30 kg or 250 kg per drum. Solid product: packed in plastic woven bags with inner polyethylene liner, 25 kg net weight per bag. Customized packages are available upon customer requirements. Store indoors in cool and well‑ventilated place, keep dry. Shelf life: 12 months.
HEDP is acidic. Take labor‑protection measures during operation. Avoid contact with skin and eyes. Rinse immediately with plenty of clean water in case of contact.
