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Home » Products » Water Treatment Chemical » Water Treatment Chemicals CAS No 2809-21-4 1-Hydroxyethylidene-1, 1-Diphosphonic Acid 98% HEDP


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Water Treatment Chemicals CAS No 2809-21-4 1-Hydroxyethylidene-1, 1-Diphosphonic Acid 98% HEDP

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 98%


1-Hydroxy Ethylidene-1,1-Diphosphonic Acid

CAS No.   2809-21-4

Molecular Formula:   C2H8O7P2                                                                                         

Molecular weight:  206.02

Hazard class/UN No./Packaging: UN 3265 8/PG III

Structural Formula: 



HEDP is a kind of scale and corrosion inhibitor which belongs to organic phosphonic acid. It can form stable complexes with iron, copper, zinc and other metal ions, and can also dissolve the metal surface oxide. Under 250 ºC condition, HEDP can still play a good corrosion and scale inhibition effect.

HEDP can react with metal ions in water system to form hexa-element chelating complex, especially with calcium ions.

HEDP has good anti-scale and visible threshold effects. When used in combination with other water treatment chemicals, it shows ideal synergistic effects.

HEDP solid state is a high purity product, suitable for cold winter areas; Because of its high purity, it is especially used as the cleaning age
nts in electronics industry, and additives in daily chemicals.


Item  Standard 

white crystalline powder

Active content (as HEDP. H2O) (%) 98.0 min

Phosphorous acid as PO33- %

0.8 max

Phosphoric acid as PO43 %

0.5 max
Chloride as Cl  ppm 100 max
PH (1% solution) @20 °C 2.0 max
Iron content (Fe ppm) 20.0 max


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. 

Package and Storage:

HEDP 98% : 25kg,  25 MT with pallet, 27 MT without pallet

Storage for one year in shady room and dry place.

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