CAS No. 2809-21-4
Molecular Formula: C2H8O7P2 Molecular weight: 206.02
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. HEDPshows 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
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.
|Appearance||Clear, Colorless to pale yellow aqueous solution||White crystal powder|
|Active content (HEDP)%||60.0 min||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|
Achimie 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.
Package and Storage:
HEDP liquid: 200L plastic drum,IBC(1000L),customers’ requirement.
HEDP solid: 25kg/bag,customers’ requirement.
Storage for twelve months in room shady and dry place.
Acidity, Avoid contact with eye and skin, once contacted, flush
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid;
Hydroxyethylidene Diphosphonic acid(HEDP);
Оксиэтилидендифосфоновая кислота(ОЭДФ -кислота )