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Home > Products > Water Treatment Chemicals > 1-Hydroxyethylidene-1, 1-Diphosphonic Acid (HEDP)

1-Hydroxyethylidene-1, 1-Diphosphonic Acid (HEDP)

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Basic Info

Model No.:  98% solid, 60% liquid

Product Description

Model NO.: 98% solid, 60% liquid Environmental Protection: Yes Appearance: Liquid 1FCL=: 80 Drums Solid Content: 98% Transport Package: 250kg, 270kg, 290kg, IBC, etc. Origin: China Acid-Base Property: Acidic Surface Disposal Agent Color: Colorless or Pale Yellow Transparent Type: Industrial Circulating Water Treatment Agent Liquid Content: 60% Trademark: SINOCHEM Specification: 60%/98%
1-Hydroxyethylidene-1, 1-Diphosphonic Acid (HEDP)
1-Hydroxyethylidene-1, 1-Diphosphonic Acid (HEDP)
Molecular Formula:C2H8O7P2
Molecular Weight:206.03
CAS: 2809-21-4

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 centigrade. 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.

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.

HEDP liquid: Normally In 250kg net Plastic Drum, IBC drum can also be used as required.
HEDP solid:25kg/kraft paper bag.

Store for ten months in room shady and dry place.


Test Item
Appearance Colorless or pale yellow transparent liquid
Active content(HEDP)% 60min
Phosphorous acid(as PO33-)% 2.0max
Phosphoric acid (asPO43- )% 0.8max
pH(1% solution) 2max
Density (20ºC)g/cm3 1.40min
Fe iron ppm 10 max
Ca sequestration (mg CaCO3/g) 500min
Color (APHA) 30max
Chloride  (as Cl-) % 0.01max
Test Item Standard
Appearance White crystal powder
Active content(HEDP.H2O)% 98.0min
Active content(HEDP) % 90.0min
Phosphorous acid(as PO33-)% 0.5max
Phosphoric acid (asPO43-)% 0.3max
pH(1% water solution) 2max
Fe mg/L 5max
Chloride  (as Cl-)%  0.008max

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Product Categories : Water Treatment Chemicals