Tetra Sodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP·Na4), also known as Tetrasodium Etidronate, is a high-performance organophosphonic acid scale and corrosion inhibitor. Engineered for superior stability, it serves as an exceptional inhibitor for calcium carbonate and forms stable complexes with metal ions such as Iron (Fe), Copper (Cu), and Zinc (Zn), effectively dissolving surface oxides to maintain system integrity.
This versatile chemical is available in both colorless liquid and white powder forms, making it ideal for a wide range of industrial applications. From low-pressure boiler systems and circulating cooling waters to specialized roles as a peroxide stabilizer in the dyeing industry and a chelating agent in non-cyanide electroplating, HEDP·Na4 ensures operational efficiency even in extreme conditions up to 250℃.
Detailed Parameters
| CAS No. | 29329-71-3 (x-Na) / 3794-83-0 (4-Na) | Molecular Formula | C2H4O7P2Na4 |
|---|---|---|---|
| Molecular Weight | 294 | Appearance | Transparent Liquid / White Powder |
| Active Content (HEDP) | Liquid: 20.3-21.7% / Powder: 60.0% min | Active Content (HEDP·Na4) | Liquid: 29.0-31.0% / Powder: 85.0% min |
| Total Phosphoric Acid | Liquid: 18.4-20.4% / Powder: 55.0% min | pH (1% solution) | 10.0 - 12.0 |
| Iron (Fe) Content | Liquid: 20.0 mg/L max / Powder: 35.0 mg/L max | Stability Limit | Effective up to 250℃ |
Key Advantages
Superior Scale Inhibition
Highly effective in preventing calcium carbonate scale in boilers and circulating water systems.
High Thermal Stability
Maintains excellent corrosion and scale inhibition performance at temperatures up to 250℃.
Powerful Chelating Ability
Forms stable complexes with Fe, Cu, and Zn ions to dissolve metal surface oxides efficiently.
Versatile Application
Suitable for power plants, chemical industry, metallurgy, fertilizer production, and textile dyeing.
Cold Climate Friendly
The powder form is highly water-soluble and ideal for use in winter or freezing regions.
Multi-Industry Utility
Functions as a peroxide stabilizer in dyeing and a chelating agent in non-cyanide plating.
Product Gallery
Management Platforms
Flexible Packaging
Available in 200L drums, 1000L IBCs, and 25kg bags to meet varied industrial needs.
Quality Control
Strict adherence to purity and active content specifications for consistent performance.
Safe Storage
Stable shelf life of ten months when stored in shady, dry, and ventilated environments.
Safety Protocol
Alkaline nature requires standard PPE; immediate water rinsing for skin/eye contact.
Logistics Efficiency
Optimized supply chain for rapid delivery of both liquid and powder variants globally.
Customization
Packaging and concentrations can be adjusted based on specific customer requirements.
Investment Return Comparison
| Metric | Standard HEDP | HEDP·Na4 (Sodium Salt) |
|---|---|---|
| Solubility | Moderate | Excellent / Rapid |
| PH Stability | Acidic | Alkaline (10.0-12.0) |
| Handling | Corrosive Liquid | Easier (Powder/Buffered Liquid) |
| Freezing Risk | High | Low (Powder ideal for cold zones) |
| Application Range | General | Specialized (Plating/Dyeing/Boilers) |
Frequently Asked Questions
HEDP·Na4 is the sodium salt version of HEDP, providing an alkaline pH and significantly better solubility, which makes it more suitable for specific industrial applications and cold-weather storage.
It is widely used in electric power, chemical industry, metallurgy, and fertilizer production for scale and corrosion inhibition, as well as in the textile dyeing and electroplating industries.
Yes, HEDP·Na4 maintains its scale and corrosion inhibition effects in environments with temperatures reaching up to 250℃.
It should be stored in a shady and dry room. Under these conditions, the product typically remains stable for up to ten months.
Yes, it is an effective scale inhibitor for calcium carbonate, making it suitable for swimming pools, municipal cleaning systems, and circulating water systems.
Since HEDP·Na4 is alkaline, avoid contact with eyes and skin. If accidental contact occurs, rinse the affected area immediately with plenty of water.
