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HEDP.Na4 (Tetrasodium Etidronate): A Versatile Chemical for Scale and Corrosion Control

Tetra sodium of 1-Hydroxy Ethylidene-1, 1-Diphosphonic Acid, commonly known as HEDP•Na4 or Tetrasodium Etidronate, is a prominent chemical compound widely recognized for its exceptional properties in scale and corrosion inhibition. With its primary CAS number 3794-83-0 (for the tetrasodium salt), HEDP•Na4 boasts a molecular formula of C2H4O7P2Na4 and a molecular weight of 294.


This sodium salt of HEDP is a powerful member of the phosphonate family of chemicals. Its effectiveness stems from its strong ability to chelate metal ions, such as calcium, magnesium, iron, copper, and zinc. By sequestering these ions, HEDP•Na4 prevents them from precipitating and forming insoluble deposits (scale) on surfaces. This chelating action is particularly effective against calcium carbonate scale, a common issue in water systems. Beyond scale inhibition, HEDP•Na4 also offers significant corrosion control benefits. It forms a protective film on metal surfaces, mitigating the corrosive attack by dissolved oxygen and other aggressive species present in water.


One of the key advantages of HEDP•Na4 is its stability under challenging conditions. It maintains its efficacy over a broad pH range and at elevated temperatures, making it suitable for diverse industrial processes, including those operating at temperatures up to 250°C. This thermal stability is crucial in high-temperature applications like boiler water systems and industrial cleaning.


HEDP•Na4 is available in both solid (granular or powder) and liquid forms, offering flexibility in handling, transportation, and application depending on the specific needs of the user. The solid form is typically a white powder and is easily soluble in water, while the liquid form is usually a colorless to yellowish transparent solution. The solid form is often preferred in regions susceptible to freezing or where ease of transport and storage are paramount.


The primary and most extensive application of HEDP•Na4 is in water treatment. It is indispensably used in:

Circulating Cooling Water Systems: Preventing scale formation and corrosion on heat exchange surfaces, maintaining system efficiency and extending equipment lifespan.

Medium and Low Pressure Boiler Water Systems: Controlling scale and inhibiting corrosion within boilers to ensure safe and efficient operation.

Oil Field Water Pipelines: Mitigating scale and corrosion issues in water used for injection or transport in oil and gas operations.

Industrial Cleaning: Used as a component in cleaning formulations for removing existing scale and deposits from equipment and surfaces.


Beyond water treatment, HEDP•Na4 finds valuable applications in other industries:

Light Woven Industry: Employed as a detergent component for cleaning metals and nonmetals.

Dyeing Industry: Acts as a peroxide stabilizer in bleaching processes, ensuring consistent bleaching results and preventing peroxide decomposition. It also functions as a dye-fixing agent.

Non-Cyanide Electroplating: Utilized as a chelating agent to manage metal ion concentrations and improve the quality of the plating bath, offering an environmentally friendlier alternative to cyanide-based baths.

Daily Chemicals: Can be included as an additive in various formulations.


The versatility, effectiveness, and stability of HEDP•Na4 make it a preferred choice for many industrial formulators and end-users. Its ability to simultaneously address scale, corrosion, and chelation issues with high efficiency at relatively low concentrations contributes significantly to operational cost savings and performance improvement.


For industries requiring high-performance chemicals like HEDP•Na4, securing a reliable source is critical. NINGBO INNO PHARMCHEM CO.,LTD. is a dedicated manufacturer and supplier offering high-quality HEDP•Na4 in both liquid (typically 30% active) and solid (typically 80% active) grades, meeting rigorous industry standards. We provide detailed specifications, including active content, iron content, moisture, density, and pH, ensuring product suitability for various applications.


When looking to buy or purchase HEDP•Na4, understanding the specific needs of your application is essential. NINGBO INNO PHARMCHEM CO.,LTD. offers flexible packaging options, including 25kg bags, 250kg drums, and 1250kg IBCs, catering to different volume requirements. We strive to provide transparent information regarding product specifications and availability.


Prospective clients interested in exploring the benefits of HEDP•Na4 for their operations can inquire about the competitive price structures offered by NINGBO INNO PHARMCHEM CO.,LTD. Our commitment to quality and customer service positions us as a key supplier in the global market for phosphonate chemicals. Whether you are a large-scale industrial consumer or a formulator, finding a consistent and quality source is key, and NINGBO INNO PHARMCHEM CO.,LTD. is equipped to meet diverse procurement needs for HEDP•Na4.


In conclusion, HEDP•Na4 stands as a cornerstone chemical for managing scale and corrosion in water systems and as a vital additive in detergents, textiles, and electroplating. Its multifunctional capabilities ensure efficiency and longevity of industrial processes. NINGBO INNO PHARMCHEM CO.,LTD. remains a reliable partner for the supply and purchase of this essential chemical, offering various grades and packaging to meet the demands of the global market.

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