EDTMP Sodium


EDTMP Sodium is nitrogenous organic polyphosphoric acid, a part of a cathodic corrosion inhibitor. Its corrosion inhibition is 3~5 times better than that of inorganic polyphosphate. EDTMP Sodium can be fully dissolved in water. In addition, it is innocuous and has no pollution to the environment.

Ethylenediamine tetramethylene phosphonic acid sodium also has good chemical stability and thermal tolerance. It shows excellent scale inhibition ability under a temperature of 200℃.

It can dissociate into eight positive-negative ions and thus chelate with many metal ions to form a polymer reticulation complex, destroying the normal crystallization of the calcium scale. EDTMP sodium shows better antiscale effects on calcium sulfate and barium sulfate.

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EDTMP Sodium


AppearanceClear yellow to umber transparent liquid
Active component (EDTMPS), %30 Min.
Organic phosphonic acid (as PO43-), %10.0 Min.
Phosphorous acid (as PO33-), %5.0 Max.
Phosphoric acid (as PO43-), %1.0 Max.
Chloride (Cl), %3.0 Max.
pH (1% solution)9.5~10.5
Density (20℃) g/cm31.25 Min.


EDTMP sodium can be a corrosion inhibitor in the circulating cool water system and boiler water. In addition, it is a chelating agent in the non-cyanogen electroplating industry and a water-softening agent in the printing & dyeing industry.

When used alone, 2~10 mg/L is preferred. When built with HPMA by ratio ETDMP: HPMA=1:3, EDTMP sodium can be used for the low-pressure boiler. It can also be built with BTA, PAAS, and zinc salt.

Packing and storage:

200L plastic drum, IBC(1000L), as customers’ requirement.

200L plastic drum 1000L IBC

Storage for ten months in a shady room and dry place.