EDTMP·Na5, Pentasodium Ethylenediamine Tetramethylene Phosphonate


EDTMP·Na5 is pentasodium salt of ethylenediamine tetramethylene phosphonate. It is a neutral solid organophosphoric salt.

EDTMP·Na5 is nitrogenous organic polyphosphonic acid, which is a part of the cathodic corrosion inhibitor. This pentasodium salt can be fully dissolved in water, innocuous, and no pollution to the environment. It has good chemical stability and thermal tolerance.

Pentasodium ethylenediamine tetramethylene phosphonate has a good scale inhibition property under temperature 200℃. It can dissociate into 8 positive-negative ions, thus can chelate with more than two metal ions to form more than two polymer reticulation complex. The complex can be quickly dissolved in water to destroy the normal crystallization of the calcium scale. EDTMP·Na5 shows better scale inhibition effects to calcium sulfate and barium sulfate.

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Molecular Formula:


Molecular Weight:


Structure Formula:

EDTMP·Na5 structure formula


AppearanceAmber transparent liquidWhite powder
Active content (EDTMP·Na5), %30.0-32.581.4 Min.
Active content (EDTMPA), %24.0-26.065.0 Min.
Chloride (Cl), %2.0 Max.2.0 Max.
pH Value6.0~8.0(as it)6.0~8.0 (1% water solution)
Density (20℃), g/cm31.25 Min.
Fe, mg/L20 Max.20 Max.


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

The solid-state EDTMP·Na5 is slightly easy to deliquescence, convenient in transportation, and suitable for usage in winter and freezing districts.

Packing and Storage:

Liquid: 200L plastic drum, IBC(1000L), customers’ requirement. Storage for ten months in shady room and dry place.

200l plastic drum 1000l IBC

Solid: 25kg/bag, customers’ requirement. Storage for one year in shady room and dry place.

25kg paper bags


EDTMP·5Na, EDTMP pentasodium salt.


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