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HS-311 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)

Product name HS-311 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
CAS No. 2809-21-4
Molecular Formula C2H8O7P2
Molecular Weight 206.02
Structural Formula
Properties & Use It is an organic phosphoric acid series antiincrustation corrosion inhibitor. It has good stability in high pH-value conditions; has good resistance to acids/alkali and oxidation.
HEDP is widely used for electrical power, chemical engineering, metallurgy and chemical fertilizer industries.
Conform to HG/T 3537-1999
Item Details
HG/T 3537-1999  
Appearance colorless or light yellow transparent liquid white powdered solid
Active ingredient (HEDP)%≥ 50.0       60.0 89
Phosphorous acid(PO33-)% ≤ 2.0        2.0 0.8
Phosphoric acid (以PO43-)% ≤ 0.8        0.8 0.5
Chloride (Cl-)% ≤ 0.01        0.01 0.01
pH-value (1%aqueous solution) ≤ 2          2 2
Density(20℃)g/cm3 1.34       1.40 ——
Cacium chelating value mg/g 450        500 ——
Iron (2+) content mg/L ≤ 10         10 5
Active ingredient (HEDP H2O)%≥ —— 98
Packing & Storage HEDP liquid: in plastic drum, 30kg/drum or 250Kg; HEDP solid: in plastic woven bag lined with PE film, net wt.25kg/bag, or upon users' demand. Stored in cool and draugthty place. Shelf life is 12 months.
Safety Protection Avoid contact with skin and eyes; wash with plenty of water.


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