CAS Number: 2809-21-4
Content: ≥90%, ≥60%, ≥50%
MOQ:1000KG
Pkg. Spec.：Liquids are packaged in plastic drums, 30kg or 250kg per drum; solids are packaged in plastic woven bags lined with polyethylene bags, net weight per bag, 25kg
| Item | Standard / Type | HEDP-50 | HEDP-60 | HEDP-90 (Crystal) |
|---|---|---|---|---|
| Compliance Standard | — | GB/T 26324-2010 | HG/T 3537-2010 | |
| Appearance | — | Colorless or light yellow transparent liquid | White crystal | |
| Active Content (as HEDP) % ≥ | — | 50 | 60 | 90 |
| Phosphorous Acid (as PO₃³⁻) % ≤ | — | 2.0 | 2.0 | 0.8 |
| Phosphoric Acid (as PO₄³⁻) % ≤ | — | 0.8 | 0.8 | 0.5 |
| Chloride (as Cl⁻) μg/g ≤ | — | 200 | 100 | 100 |
| pH (1% aqueous solution) | — | 1.5–2.0 | 1.5–2.0 | 1.5–2.0 |
| Density (20℃) g/cm³ ≥ | — | 1.36 | 1.40 | — |
| Calcium Chelating Value mg/g ≥ | — | 450 | 500 | — |
| Iron (as Fe²⁺) mg/L ≤ | — | 20 | 10 | 10 |
| Active Content (as HEDP·H₂O) % ≥ | — | — | — | 97 |
Product Description
1-Hydroxyethylidene-1,1-diphosphonic acid (HEDP) is an organic phosphonic acid scale and corrosion inhibitor, widely used in industrial water treatment. It is also an excellent metal ion chelating agent, capable of forming stable complexes with metal ions such as iron, copper, and zinc, while dissolving oxides from metal surfaces.
HEDP is commonly applied as a chelating and dispersing agent in the textile and dyeing industry, and as a concrete retarder in the construction industry, improving workability and durability. With its multifunctional properties, HEDP is one of the most important water treatment chemicals used in power plants, petrochemicals, metallurgy, and building materials.
FAQ
Q1: What is HEDP used for in water treatment?
A1: HEDP is widely used as a scale and corrosion inhibitor in industrial circulating water, boilers, and cooling systems. It prevents scale formation, protects equipment, and extends system life.
Q2: Can HEDP be used as a chelating agent?
A2: Yes. HEDP is a highly effective chelating agent for metal ions such as Fe²⁺, Cu²⁺, and Zn²⁺. It forms stable complexes and helps dissolve metal oxides.
Q3: How is HEDP applied in the textile industry?
A3: In the textile and dyeing industry, HEDP acts as a chelating dispersant, improving dyeing performance and preventing metal ion interference during production.
Q4: What role does HEDP play in construction?
A4: HEDP is used as a concrete retarder, which improves workability, reduces early setting, and enhances construction quality in large-scale projects.
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