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Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium

CAS No. 1429-50-1

Molecular Formula:C6H12O12N2P4Na8

Molecularweight: 612.13


EDTMPS is nitrogenous organic polyphosphonic acid, a part of cathodic corrosion inhibitor.Its corrosion inhibition is 3~5 times better than that of inorganic polyphosphate. It can be fully dissolved in water, innocuous and none pollution to environment, has good chemical stability and thermal tolerance. It shows excellent scale inhibition ability under temperature 200°C.


Appearance: Yellow to umber clear liquid

Active component (EDTMPS): 30.0min

Organic phosphonic acid (asPO43- ): 10.0%min

Phosphorous acid (as PO33-): 5.0%max

Phosphoric acid (asPO43- ): 1.0%max

pH (1% water solution):9.5-10.5

Density (20°C) g/cm3: 1.25min

Chloride (as Cl-): 3.0%max

Package :Normally In 250kg net Plastic Drum, IBC drum can also be used as required.


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

Information is up-to-date: 07.03.2018

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