Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium 2019-09-11T06:06:38+00:00

Project Description

Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium

CAS No.: 1429-50-1
Molecular Formula: C6H12O12N2P4Na8
Molecular weight: 612.13

Structural Formula:

EDTMPS corrosion inhibitor


EDTMP Sodium is nitrogenous organic polyphosphonic acid, a part of cathodic corrosion inhibitor. Its corrosion inhibition is 3~5 times better than that of inorganic polyphosphate. EDTMP Sodium can be fully dissolved in water. It is innocuous and none 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°C. It can dissociate into 8 positive-negative ions, thus can chelate with many metal ions to form polymer reticulation complex, to destroy the normal crystallization of calcium scale. EDTMP sodium shows better antiscale effects on calcium sulfate and barium sulfate.


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% water solution)9.5-10.5
Density (20℃) g/cm31.25 min


EDTMP sodium can be used as a corrosion inhibitor in circulating cool water system and boiler water. It is a chelating agent in non-cyanogen electroplating industry and a water-softening agent in 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.

Package and Storage:

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

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