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HEDP 60 aqueous solution CAS 2809-21-4
HEDP 60% aqueous solution CAS 2809-21-4
  • CAS No.:

  • Molecular Formula:

  • Quality Standard:

    98% Min || 58%-62%
  • Packing:

    25kg/bag || 250kg/drum
  • Mininmum Order:

    1,000 kg
  • Technical Data Sheet: TDS HEDP.pdf

    Safety Date Sheet: MSDS HEDP Powder-TNJ.pdf

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  • Product Details

Etidronic acid HEDP 60% solution CAS 2809-21-4, also called 1-Hydroxyethylidene-1,1-diphosphonic acid, 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℃. 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.


Specification of HEDP

HEDP 58%-62% liquid

Appearance                                      Colorless to pale yellow aqueous solution
Active content (HEDP)%                    58.0-62.0
Phosphorous acid (as PO33-)%        1.0 max
Phosphoric acid (asPO43- )%            0.6 max
Chloride (as Cl-) ppm                        100.0 max
pH (1% solution)                               2.0 max
Density g/cm3                                   1.43-1.47
Fe,mg/L                                             10.0 max
Colour APHA (Hazen)                         30.0 max
Ca sequestration (mg CaCO3/g)       500.0 min

HEDP 98% solid

Appearance                                       White crystal powder
Active content(HEDP)%                      90.0 min
Active content (HEDP H2O)%             98.0 min
Phosphorous acid (as PO33-)%         0.8 max
Phosphoric acid  (asPO43- )%            0.5 max
Chloride (as Cl-) ppm                         100.0max
pH (1% solution)                                2.0 max
Fe,mg/L                                              5.0 max


Application of HEDP

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..
1) In light woven industry,  HEDP is used as detergent for metal and nonmetal.
2) In dyeing industryHEDP is used as peroxide stabilizer and dye-fixing agent;
3) In non-cyanide electroplatingHEDP is used as chelating agent. The dosage of 110mg/L is preferred as scale inhibitor,
    10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. 

4) HEDP is usually used together with polycarboxylic acid.

5) HEDP is listed as an ingredient of several cosmetic formulations where it is used for suppressing radical formation, emulsion stabiliser and viscosity control.


Solid:  25kg per bag,25mt per 20ft container

Liquid: 250kg per drum,80drums per 20ft container


Storage & Transport
Stored in cool and airy place; away from fire and heat; handle with care; no breakage, avoid leakage.It is valid for 1 years under proper condition.
HEDP is classified as Dangerous Good for transport (UN 3261,Class 8,Packing group III)
Please refer to MSDS for more information about Safety,Storage and Transportation.

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