HEDP

1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
CAS No. 2809-21-4                                    
Molecular Formula:   C2H8O7P2                Molecular weight: 206.02

Propertiesof HEDP:
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 C. 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:
Appearance     
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     -