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High Quality 1-Hydroxyethylidene -1,1-diphosphonic Acid with High Purity 98% HEDP Powder

Name: HEDP/1-Hydroxyethylidene-1,1-diphosphonic acid
CAS: 2809-21-4
Chemical formula: C2H8O7P2
Appearance: 98% white crystal powder
MOQ: No request
  • HEDP 2809-21-4


  • 3808940090

Sinobio HEDP 98% Powder

Purity: 98%

CAS: 2809-21-4

Formula: C2h8o7p2

EINECS: 220-552-8

MF: C2H8O7P2

Package: 25kg/bag

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℃. 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.





Clear, Colorless to pale yellow aqueous solution

White crystal powder

Active content (HEDP)%


90.0 min

Active content (HEDP·H2O)%


98.0 min

Phosphorous acid (as PO33-)%

2.0 max

0.8 max

Phosphoric acid  (as PO43- )%

0.8 max

0.5 max

Chloride (as Cl-)%

0.02 max

0.01 max

pH (1% water solution)

2.0 max

2.0 max

Density  (20℃)g/cm3

1.40 min


Fe, mg/L

20.0 max

10.0 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.

Product Packaging:

 HEDP Powder CAS 2809-21-4   HEDP Powder CAS 2809-21-4    HEDP Powder CAS 2809-21-4

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