1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP) is a high-performance organophosphoric acid corrosion inhibitor engineered for superior scale prevention and metal surface protection. By chelating with Fe, Cu, and Zn ions to form stable complexes, HEDP effectively dissolves oxidized materials and maintains system efficiency in demanding industrial environments.
Designed for extreme stability, HEDP maintains excellent efficacy at temperatures up to 250°C and exhibits strong resistance to hydrolysis under high pH values. Whether in liquid or crystal powder form, its high purity makes it an essential additive for water treatment, electronic cleaning, and daily chemical formulations, offering unmatched chlorine oxidation tolerance compared to traditional organophosphoric acids.
Detailed Parameters
| CAS No. | 2809-21-4 | Molecular Formula | C2H8O7P2 |
|---|---|---|---|
| Molecular Weight | 206.02 | Appearance (Solid) | White crystal powder |
| Active Content (Solid) | 90.0% min | Active Content (Liquid) | 58-62% |
| Phosphorous Acid | 0.8% max (Solid) | Phosphoric Acid | 0.5% max (Solid) |
| pH (1% solution) | 2.0 max | Ca Sequestration | 500.0 mg CaCO3/g min |
Key Advantages
Corrosion Inhibition
Forms stable chelating compounds with Fe, Cu, and Zn to prevent oxidation and surface degradation.
Thermal Stability
Maintains exceptional scale and corrosion inhibition effects even at temperatures reaching 250°C.
Chemical Resistance
Superior tolerance to high pH values and chlorine oxidation compared to other organophosphoric salts.
High Purity Grade
Crystal powder form allows for use as a precision cleaning agent in sensitive electronic fields.
Synergistic Effect
Works optimally when paired with polycarboxylic acids to enhance antiscale and threshold effects.
Versatile Application
Effective across power plants, chemical industries, metallurgy, and textile dye-fixing processes.
Product Gallery
Management Platforms
Liquid Packaging
Available in 200L plastic drums or 1000L IBC tanks based on customer requirements.
Solid Packaging
Supplied in high-grade 25kg bags for easy handling and long-term storage.
Storage Standards
Maintain in a shady, dry room for a shelf life of up to twelve months.
Safety Protocols
Acidic product; requires labor protection and immediate rinsing upon skin/eye contact.
Logistics Support
Specialized shipping for chemical products ensuring stability and safety during transit.
Quality Control
Strict adherence to purity indexes (HEDP 90% min for solids) via rigorous testing.
Investment Return Comparison
| Application Role | Standard Dosage | Expected Benefit |
|---|---|---|
| Scale Inhibitor | 1-10 mg/L | Reduced mineral buildup |
| Corrosion Inhibitor | 10-50 mg/L | Extended equipment lifespan |
| Industrial Detergent | 1000-2000 mg/L | Deep metal surface cleaning |
| Dye-fixing Agent | Customized | Enhanced color stability |
| Chelating Agent | Process-specific | Effective metal ion sequestration |
Frequently Asked Questions
HEDP is widely used as a scale and corrosion inhibitor in circulating cooling water systems, oil fields, and low-pressure boilers across the electric power, chemical, and metallurgical industries.
HEDP offers superior chemical stability under high pH values and significantly better tolerance to acid, alkali, and chlorine oxidation compared to other organophosphoric salts.
Yes, in the dyeing industry, HEDP serves as a peroxide stabilizer and a dye-fixing agent, ensuring high-quality fabric finishing.
When combined with polycarboxylic acids, HEDP exhibits a powerful synergistic effect, enhancing both the antiscale and the visible threshold effects of the water treatment system.
Yes, the solid crystal powder state is specifically suitable for usage in winter and freezing districts where liquid solutions might crystallize or freeze.
Since HEDP is acidic, operators must use appropriate labor protection. Avoid contact with eyes and skin; in case of splashing, rinse immediately with plenty of water.
