HEDP You May Also Be Interested In: hedp water pipelines
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

[CAS] 2809-21-4 Dequest:2010

Molecular Formula: C2H8O7P2 Molecular weight: 206

Structural Formula:

This product is an organophosphoric acid corrosion inhibitor, It can chelate with Fe, Cu, and Zn ions to form stable chelating compounds, thus it can dissolve the oxidized materials on these metals surfaces. HEDP shows excellent antiscale corrosion inhibition effects under temperature 2500. It has good stability under high pH value, hard to be hydrolyzed, and hard to be decomposed under ordinary light and heat conditions.

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 (200) g/cm3 1.40 
Ca Chelating value mg/g 500 min 
Fe ion ppm 10 max 20 max
Colour APHA (Hazen) 40 min 

This product is widely used in circulating cool water system, oil field water pipelines and low-pressure boilers for antiscale corrosion inhibition in fields such as electric power, chemical industry, metallurgy, fertilizer, etc. . In light weaven industry, this product is used as detergent for metal and nonmetal. In dyeing industry, this product is used as peroxide stabilizer and dye-fixing agent; In non-cyanide electroplating, this product is used as chelating agent.
Model Number
[CAS] 2809-21-4
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