HEDP (1-Hydroxyethylidene-1,1-Diphosphonic Acid)
CAS Number: 2809-21-4
Organophosphonic acid scale and corrosion inhibitor for cooling water, boiler water and oilfield systems. Effective against CaCO3 and BaSO4 scale at low dosage.
Technical Specifications
| density | 1.43–1.47 g/mL |
| chloride | ≤ 100 mg/L |
| packaging | 30 kg drums or IBC |
| appearance | Colorless to pale yellow liquid |
| active content | 58–62% |
| pH 1% solution | 1.0–2.0 |
| phosphonic acid | 58–62% |
Applications
- Cooling water systems
- Boiler water treatment
- Oilfield scale prevention
- Swimming pool metal sequestrant
- Textile dyeing auxiliary
- Concrete admixture retarder
Key Features
- Dual function: scale inhibitor + corrosion inhibitor
- Effective at low dosage (2–10 ppm)
- Stable under high temperature (up to 200°C)
- Synergistic with zinc salts
- Chlorine-tolerant
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