Etidronate Disodium 2018-05-08T08:06:58+00:00

Etidronate Disodium, HEDP Na2

Etidronate Disodium is organophosphonic acid corrosion inhibitor. It has two appearances, colourless to pale yellow transparent liquid and white powder. White powder Etidronate Disodium (HEDP Na2), its melting point is 198°C – 199°C. It is soluble in water and ethanol and has strong moisture absorption.

CAS No.7414 83 7

Molecular Formula: C2H8O7P2Na2

Molecular Weight: 250

Etidronate Disodium Sructural Formula

HEDP 2Na, disodium salt of 1-hydroxy ethylidene-1 1-diphosphonic acid, HEDP Na2

Etidronate Disodium, HEDP Na2


Etidronate Disodium has good scale and corrosion inhibition effects even under 250℃. It can dissolve the oxidized materials. HEDP Na2 is stable at high pH value. It is not easy to be hydrolyzed and to be decomposed under normal light and heat condition. Etidronate Disodium acid/alkaline and chloride oxidation tolerance are better than that of other organophosphonic acids.

HEDP Na2 can form six-ring chelating compounds with metal ions in a water system, Ca2+ in particular. This product also has good obvious dissolution threshold effects. When used with other water treatment agents, its synergistic effects are better.

Etidronate Disodium is known in the market as an organo-phosphonic acid corrosion inhibitor. HEDP Na2 can chelate with Fe, Cu, and Zn ions. Etidronate Disodium (HEDP Na2) with chelation value 270 is a good substitute for EDTA disodium powder.

Item Index
Appearance colourless to yellowish transparent liquid white powder
Active content (HEDP) % ≥ 16.5 74.0 – 79.0
Active content (HEDP Na2) % ≥ 20 ≥ 89.8
Phosphoric acid (asPO33- )% ≤ 3
Dry weight loss % 3 – 6
pH (1% solution) 4.0 – 6.0 4.0 – 6.0
Density (20℃) g/cm3 1.12-1.22
Fe,mg/L ≤ 35
Moisture % 3.0 – 6.0


  • Used as corrosion inhibitor & chelating agent in circulating cool water system

  • Used as corrosion inhibitor medium and low-pressure boiler

  • Used as corrosion inhibitor oil field water pipelines

  • Used as detergent for metal and nonmetal in light woven industry

  • Used as peroxide stabilizer and dye-fixing agent in dyeing industry

  • Used as chelating agent in non-cyanide electroplating

Packing& Storage


Different Etidronate Disodium, Different Pack.


Etidronate Disodium (HEDP Na2) liquid: 200L plastic drum,IBC(1000L).

Etidronate Disodium (HEDP Na2) powder: 25kg/bag.

All above can be packed as customers’ requirements.


Ten months in room shady and dry place.

Safety Protection

Attention!Avoid Etidronate Disodium (HEDP Na2) contacts with eye and skin. Once happened, flush there with water.

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