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HEDP•Na2 is an organophosphonic acid corrosion inhibitor, it can chelate with Fe, Cu, and Zn ions.
  • HEDP•Na2
  • ThFine
  • CAS No. 7414-83-7
  • Disodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid


Disodium Salt of 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 



CAS No.: 7414-83-7

EINECS No.: 231-025-7

Molecular Formula: C2H6O7P2Na          Molecular Weight: 250

Structural Formula:



HEDP•Na2 is an organic phosphonic acid corrosion inhibitor, it can chelate with Fe, Cu, and Zn ions, it can dissolve the oxidized materials. It has good scale and corrosion inhibition effects even under 250℃, it is stable under high pH value, not easy to be hydrolyzed, not easy to be decomposed under normal light and heat condition, its acid/alkaline and chloride oxidation tolerance are better than that of other organic phosphonic acids. 

HEDP•Na2 can form six-ring chelating compounds with metal ions in water system, Ca2+ in particular. 

HEDP•Na2 has good scale inhibition effects and obvious dissolution threshold effects. When used with other Water Treatment Chemicals, the synergistic effects is better.





Colorless to light yellow transparent liquid

White powder

Active content (HEDP) %

16.5 min


Active content (HEDP•Na2%

20.0 min


Density (20℃)g/cm3



Fe, mg/L


20.0 max




PH (1% water solution)




HEDP•Na2 is widely used in circulating cooling water system, medium and low pressure boiler, oil field water pipelines as scale and corrosion inhibitor in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP•Na2 is used as detergent for metal and nonmetal. In dyeing industry, HEDP•Na2 is used as peroxide stabilizer and dye-fixing agent. In non-cyanide electroplating, HEDP•Na2 is used as chelating agent.


Package and Storage:

HEDP•Na2 liquid: Normally in 200L HDPE drum, 1000L IBC, or customers’ requirement.

HEDP•Na2 solid: 25kg inner liner PE bag, 1000kg woven bag, or customers’ requirement.

Storage for ten months in shady room and dry place.


Safety Protection:

Weak acidity, Avoid contact with eye and skin, once contacted, flush with water.


Disodium Etidronate Hydrate;

HEDP disodium salt;

Disodium dihydrogen bisphosphonate (1-hydroxyethylidene)bisphosphonate;

Sodium etidronate; Didronel;

Etidronate; Etidronate disodium;

Etidronic acid disodium salt;

Disodium etidronate;

Salts of Phosphonates ( Antiscalants, Corrosion Inhibitors and Chelating Agents )

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