HEDP (Hydroxyethylidene Diphosphonic Acid) - High-performance scale and corrosion inhibitor for industrial water treatment. Excellent thermal stability up to 250°C with superior metal ion chelation capabilities.
| Density (20°C), g/cm³ | Liquid：1.35-1.45 g/cm³ |
| pH (1% solution) | ≤2.0 |
| Active Content, % | Liquid：50% Solid：90% |
| Appearance | Colorless to light yellow transparent liquid or White crystalline powder |
Product Name: Hydroxyethylidene Diphosphonic Acid (HEDP)
CAS Number: 2809-21-4
Molecular Formula: C₂H₈O₇P₂
Molecular Weight: 206.02 g/mol
Hydroxyethylidene Diphosphonic Acid (HEDP) is a high-performance organophosphorous scale and corrosion inhibitor renowned for its exceptional metal ion chelation capabilities. This versatile compound forms stable complexes with various metal ions including iron, copper, and zinc, while effectively dissolving metal surface oxides. With outstanding thermal stability (up to 250°C) and superior chemical resistance, HEDP demonstrates excellent performance in high pH environments and exhibits better resistance to acid, alkali, and chlorine oxidation compared to other organophosphonates. Its unique threshold effect and synergistic properties make it an ideal choice for various industrial water treatment and process applications.
Excellent Chelation Capacity: Forms stable complexes with Fe, Cu, Zn and other metal ions
High Thermal Stability: Maintains effectiveness at temperatures up to 250°C
Superior Chemical Resistance: Excellent stability in high pH conditions with resistance to hydrolysis
Outstanding Oxidation Resistance: Better chlorine oxide resistance than other organophosphonates
Effective Threshold Effect: Forms six-membered ring chelates with calcium ions
Synergistic Performance: Enhanced effectiveness when combined with other water treatment chemicals
Multi-Functional Application: Suitable for scale inhibition, corrosion control, and cleaning applications
Parameter
Liquid Form
Solid Form
Appearance | Colorless to light yellow transparent liquid | White crystalline powder |
Active Content, % | ≥ 50 | ≥ 90 |
pH (1% solution) | 2.0 | 2.0 |
Density (20°C), g/cm³ | 1.35-1.45 | - |
Specifications may vary between production batches. Please refer to the Certificate of Analysis for precise values.
HEDP is engineered for excellence across multiple industries:
Industrial Water Treatment: Cooling water systems in power, chemical, and metallurgical industries
Boiler Water Systems: Scale inhibition in low-pressure boilers and oilfield injection systems
Oil & Gas Industry: Pipeline scale prevention and production system treatment
Textile Processing: Metal/non-metal cleaning agents and peroxide stabilizers
Dyeing Industry: Fixing agent and process chemical
Cyanide-Free Plating: Effective complexing agent for electroplating applications
Industrial Cleaning: Component in various cleaning formulations
Scale Inhibition: 1-10 mg/L
Corrosion Control: 10-50 mg/L
Cleaning Applications: 1000-2000 mg/L
Optimal dosage should be determined based on specific water chemistry and system conditions.
Liquid: 30 kg and 250 kg plastic drums
Solid: 25 kg PE-lined woven bags (custom packaging available)
Storage: Store in cool, dry conditions in original sealed containers
Shelf Life: 10 months from production date when stored properly
HEDP is an acidic substance. Appropriate personal protective equipment must be worn during handling, including chemical-resistant gloves and safety glasses. Avoid contact with skin, eyes, and clothing. In case of contact, immediately flush with plenty of water and seek medical attention if necessary. For comprehensive safety information, consult the Safety Data Sheet (SDS).
[ Safety Data Sheet (SDS)]
[ Technical Data Sheet (TDS)]
[ Certificate of Analysis (COA)]
Contact our technical team to request complete documentation package
Evaluate HEDP in your specific application. Contact us to request a complimentary sample and technical consultation.
Our team of application specialists provides:
Customized formulation recommendations
Application-specific dosage guidance
Compatibility testing services
Technical consultation and troubleshooting support
Quality Assurance: All products undergo rigorous quality control testing to ensure consistent performance and reliability. Each batch is accompanied by a Certificate of Analysis guaranteeing specification compliance.
Environmental Compliance: HEDP meets international environmental standards for water treatment chemicals.
Disclaimer: The information provided is based on current knowledge and believed to be accurate. Users should conduct appropriate testing to determine suitability for specific applications. All products are supplied subject to our standard terms and conditions of sale.
| Density (20°C), g/cm³ | Liquid：1.35-1.45 g/cm³ |
| pH (1% solution) | ≤2.0 |
| Active Content, % | Liquid：50% Solid：90% |
| Appearance | Colorless to light yellow transparent liquid or White crystalline powder |
