HEDP·Na2, Hydroxy Ethylidene Diphosphonic Disodium


HEDP·Na2 is a disodium salt of hydroxy ethylidene diphosphonic acid. It is an organophosphonic acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions. HEDP·Na2 can dissolve the oxidized materials. This HEDP disodium has a good scale and corrosion inhibition effects even under 250℃.

HEDP·Na2 is stable under high pH values and not easy to hydrolyze or decompose under normal light and heat conditions. Its acid/alkaline and chloride oxidation tolerance are better than other organophosphonic acids. HEDP·Na2 can form six-ring chelating compounds with metal ions in water systems, Ca2+ in particular. HEDP·Na2 has good scale inhibition effects and obvious dissolution threshold effects. When used with other water treatment agents, the synergistic effects are better.

CAS No.:

7414-83-7, CubleK2012

Molecular Formula:


Molecular Weight:


Structure Formula:

HEDP Na2 structure formula


AppearanceColorless to yellowish transparent liquidWhite powder
Active content (HEDP), %16.5 Min.74.0-79.0
Active content (HEDP·Na2), %20.0 Min.89.8 Min.
pH (1% water solution)4.0-6.04.0-6.0
Density (20℃), g/cm31.12-1.22
Phosphorous acid (PO33-), %3 Max.
Fe, mg/L35 Max.
Moisture, %3.0-6.0


HEDP·Na2 is widely used in circulating cool water systems, medium and low-pressure boilers, and oil field water pipelines as a scale and corrosion inhibitor in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.

In the light woven industry, HEDP·Na2 is used as a detergent for metal and nonmetal. In the dyeing industry, hydroxy ethylidene diphosphonic disodium is used as a peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP·Na2 is used as a chelating agent.

Packing and Storage:

Liquid: 200L plastic drum, IBC(1000L), customers’ requirement. Storage for ten months in a shady room and dry place.

200l plastic drum 1000l IBC

Solid: 25kg/bag, customers’ requirement. Storage for ten months in a shady room and dry place.

25kg paper bags


Safety Protection:

Weak acidity, avoid contact with thje eyes and the skin. Once contacted, flush with water.


Etidronate disodium, Etidronate disodium hydrate, Etidron, BA 49280E, sm-5600.


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