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EDTMPA•Na5 is a neutral solid product. EDTMP•Na5 is nitrogenous organic polyphosphonic acid.
  • EDTMPA·Na5
  • ThFine
  • CAS No. 7651-99-2
  • Pentasodium Salt of Ethylene Diamine Tetra (Methylene Phosphonic Acid)

Pentasodium Salt of Ethylene Diamine Tetra (Methylene Phosphonic Acid) 


CAS No.: 7651-99-2                                                      EINECS No.: 231-615-4

Molecular Formula: C6H15O12N2P4Na5                   Molecular weight: 546.13

Structural Formula:



EDTMPA•Na5 is a neutral product. It is nitrogenous organic polyphosphonic acid, which is a part of cathodic corrosion inhibitor. EDTMPA•Na5 can be dissolved in water. It is non-toxic and pollution-free to environment. It has good chemical stability and heat resistance. EDTMPA•Na5 still has good scale inhibition effect under temperature 200℃. It can dissociate into 8 positive and negative ions. Thus it can chelate with multiple metal ions to form a plurality of monomeric structural of macromolecule reticular complex. The complex can be dissolved in water to destroy the normal crystallization of calcium scale. EDTMPA•Na5 has better scale inhibition effects to calcium sulfate and barium sulfate.

EDTMPA•Na5 can be used as scale and corrosion inhibitor for circulating water and boiler water system, chelating agent in non-cyanide electroplating, water-softening agent in dyeing industry, etc.

The solid of EDTMPA•Na5 is slight moisture absorption. It is easy to transport and use in cold conditions.





Amber transparent liquid

Active content (as EDTMPA)%


Active content (as EDTMP•Na5)%


Chloride (Cl-) %

2.0 max

Density (20℃) g/cm3

1.25 min

Fe, mg/L

20.0 max

PH (1% water solution)


Package and Storage:

Normally in 200L HDPE drum, 1000L IBC, or customers’ requirement.

Storage for ten months in shady room and dry place.



EDTMP pentasodium salt; 

Ethylenediamine tetra(methylenephosphonic acid) pentasodium salt; 

pentasodium trihydrogen [ethane-1,2-diylbis[nitrilobis(methylene)]]tetrakisphosphonate;

Pentasodium ethylenediamine tetramethylene phosphonate;

Phosphonic acid, 1,2-ethanediylbisnitrilobis(methylene)tetrakis-, pentasodium salt;

Ethylenediamine-N,N,N'',N''-tetrakis-(methylenephosphonic acid) pentasodium s;

Pentasodium Salt of Ethylene Diamine Tetra (Methylene Phosphonic Acid) (EDTMPNa5);

Pentasodium Salt of Ethylene Diamine Tetra (Methylene Phosphonic Acid)

Salts of Phosphonates ( Antiscalants, Corrosion Inhibitors and Chelating Agents )

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Tel: +86-632-3085111
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