Wo Hing Water Treatment Co.,Limited
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HEDP/1-HYDROXYETHYLIDENE-1,1-diphosphonic Acid/Cas 2809-21-4

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Wo Hing Water Treatment Co.,Limited

Building 3, District 5, Wuhan University Science Park, Wuhan, Hubei, China Wuhan Hubei
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Quick Information

  • Brand Name: Wo Hing
  • Place of Origin: China
  • Model Number : C2H8O7P2
  • CAS No. : 2809-21-4
  • Purity : 50%,60%,90%


1.Name:1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 2.CAS no.2809-21-4 3.Purity:50%,60%,90% 

1.Product description

Chemical name:1-Hydroxyethylidene-1,1-Diphosphonic Acid(HEDP)

china water treatment chemicals

Abbreviation: HEDP

Molecular Formula: C2H8O7P2

Molecular Weight: 206

CAS Number: 2809-21-4

Application Notes: Noted for its excellent CaCO3 scale inhibition and chlorine stability.



HEDP is an organophosphoric acid corrosion inhibitor. It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds.It can dissolve the oxidized materials on these metals’ surfaces. HEDP shows excellent scale and corrosion inhibition effects under temperature 250°C. HEDP has good chemical stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions.

Its acid/alkali and chlorine oxidation tolerance are better than that of other organophosphoric acids (salt). HEDP can react with metal ions in water system to form hexa-element chelating complex, with calcium ion in particular. Therefore, HEDP has good antiscale and visible threshold effects. When built together with other water treatment chemicals, it shows good synergistic effects.

The solid state of HEDP is crystal powder, suitable for usage in winter and freezing districts. Because of its high purity, it can be used as cleaning agent in electronic fields and as additives in daily chemicals. 



items index
Appearance Clear, Colorless to pale yellow aqueous solution White crystal powder
Active content (HEDP)% 58.0-62.0 90.0min
Phosphorous acid (as PO33-)% 1.0 max 0.8 max
Phosphoric acid  (asPO43-)% 0.6 max 0.5 max
Chloride (as Cl-) ppm 100.0 max 100.0max
pH (1% solution) 2.0 max 2.0 max
Density  (20°C)g/cm3 1.43-1.47 -
Fe,mg/L 10.0 max 5.0 max
Colour APHA (Hazen) 30.0 max -
Acetic acid % 0.5 max  
Ca sequestration (mg CaCO3/g) 500.0 min

HEDP is used as scale and corrosion inhibition in circulating cool water system, oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc.. In light woven industry, HEDP is used as detergent for metal and nonmetal. In dyeing industry, HEDP is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, HEDP is used as chelating agent. The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.

Recommended Uses: Cooling water treatment, boiler treatment, I & I cleaners, swimming pool stain prevention, metal ion control


5.Package and Storage

HEDP liquid: 200L plastic drum,IBC(1000L),customers’ requirement.

HEDP solid: 25kg/bag,customers’ requirement.

Storage for ten months in room shady and dry place.


6.Safety Protection

Acidity, Avoid contact with eye and skin, once contacted, flush with water



HEDP;HEDP(A);ETIDRONIC ACID;1-Hydroxy Ethylidene-1,1-Diphosphonic Acid; Hydroxyethylidene-1,1-diphosphonicacid(HEDP); 1-HYDROXYETHYLIDENEDIPHOSPHONIC ACID;Hydroxyethylidene Diphosphonic acid(HEDP); 1-hydroxy-1,1-Ethanediyl ester

Any related requirement please contact sales007(@)wohingwater.com
or skype: melody.welink


  • Price Condition : FOB
  • Delivery Port : Shanghai

Packaging & Delivery

  • Packing :200kg/plastic drum or as your request
  • Delivery Lead Time : in 7 days after confirmed order
  • Minimum Order : 3MT
  • Supply Ability : 3000MT/month

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