Water Treatment Chemicals, Phosphonates, Polymers, Biocides

Organophosphoric Antiscale and Corrosion Inhibitors, Chelant

Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium (EDTMP Sodium)

CAS No. 1429-50-1

Molecular Formula: C6H12O12N2P4Na8

Molecular weight: 612.13

Structural Formula:

Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium (EDTMPS) Structural Formula


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, innocuous and none pollution to environment, has good chemical stability and thermal tolerance. It shows excellent scale inhibition ability under temperature 200℃. 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 to calcium sulfate and barium sulfate.


items index
Appearance Clear yellow to umber transparent liquid
Active component (EDTMPS)% 300min
Organic phosphonic acid (asPO43- )% 10.0min
Phosphorous acid (as PO33-)% 5.0max
Phosphoric acid (asPO43- )% 1.0max
Chloride (Cl-)% 3.0max
pH (1% water solution) 9.5-10.5
Density (20℃) g/cm3 1.25min


EDTMP Sodium 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, EDTMP Sodium can be used for low pressure boiler. It can also be built with BTA, PAAS and zinc salt.

Package and Storage:

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


Ethylene Diamine Tetra (Methylene Phosphonic Acid) EDTMPA (Solid)
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP)
Amino Trimethylene Phosphonic Acid(ATMP)

Shandong IRO Water Treatment Co., Ltd.

Office Address: 2802, 1st Building, No.19 Zhangzhou 2nd Rd, Qingdao, China
Factory Address: Qicun Town, Shizhong, Zaozhuang, Shandong, China
Tel: +86-532-85027466 Fax: +86 532 85028486
Email: info@irowater.com

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