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
oxidized materials on these metals’ surfaces. HEDP shows excellent
and corrosion inhibition effects under temperature 250℃. HEDP has
chemical stability under high pH value, hard to be hydrolyzed, and
hard to be
decomposed under ordinary light and heat conditions. Its
chlorine oxidation tolerance are better than that of other
acids (salt). HEDP can react with metal ions in water system to
element chelating complex, with calcium ion in particular.
has good antiscale and visible threshold effects. When built
other water treatment chemicals, it shows good synergistic effects.
The solid state of HEDP is crystal powder, suitable for usage in
freezing districts. Because of its high purity, it can be used as
in electronic fields and as additives in daily chemicals.
Specification of HEDP:
Colorless or light yellow transparent liquid
White crystal powder
Active content (HEDP)% 58.0-62.0 89.0 min
Phosphorous acid (as PO33-)% 2.0 max 0.5 max
Phosphoric acid (asPO43- )% 0.8 max 0.5 max
Chloride (as Cl-)% 0.01 max 0.01 max
pH (1% solution) 2 max 2 max
Density (20 C)g/cm3 1.40 -
Fe ion ppm 10 max 20 max
Colour APHA (Hazen) 40 max -
HEDP is used as scale and corrosion inhibition in circulating cool
system, oil field and low-pressure boilers in fields such as
chemical industry, metallurgy, fertilizer, etc.. In light woven
industry, HEDP is
used as detergent for metal and nonmetal. In dyeing industry, HEDP
as peroxide stabilizer and dye-fixing agent; In non-cyanide
HEDP is used as chelating agent. The dosage of 1-10mg/L is
scale inhibitor, 10-50mg/L as corrosion inhibitor, and
detergent. Usually, HEDP is used together with polycarboxylic acid.
Package and Storage:
HEDP liquid: Normally In 250kg net Plastic Drum, IBC drum can also
used as required HEDP solid: 25kg inner liner polyethylene (PE)
plastic woven bag, or confirmed by clients. Storage for ten months
shady and dry place.
Safety Protection:Acidity, Avoid contact with eye and skin, once
flush with water.
HEDP;HEDP(A);HEDPA;ETIDRONIC ACID;1-Hydroxy Ethylidene-1,1-
Diphosphonic Acid; Hydroxyethylidene-1,1-diphosphonicacid(HEDP); 1-
HYDROXYETHYLIDENEDIPHOSPHONIC ACID; Hydroxyethylidene
Diphosphonic acid(HEDP);1-hydroxy-1,1-Ethanediyl ester