Water Treatment Chemicals, Phosphonates, Polymers, Biocides


Organophosphoric Antiscale and Corrosion Inhibitors, Chelant

Pentasodium Salt of Ethylene Diamine Tetra (Methylene Phosphonic Acid) (EDTMP•Na5)

CAS No.:7651-99-2

Molecular Formula: C6H15O12N2P4Na

Molecular weight: 546.13

Structural Formula:

Pentasodium Salt of Ethylene Diamine Tetra (Methylene Phosphonic Acid) (EDTMP•Na5)


EDTMP•Na5 is a neutral solid product. It is nitrogenous organic polyphosphonic acid, which is a part of cathodic corrosion inhibitor. EDTMPNa5 can be fully dissolved in water, innocuous and none pollution to environment, has good chemical stability and thermal tolerance. Pentasodium Salt of Ethylene Diamine Tetra (Methylene Phosphonic Acid) has good scale inhibition property under temperature 200℃. EDTMP•Na5 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 calcium scale. EDTMPNa5 shows better scale inhibition effects to calcium sulfate and barium sulfate.

 Pentasodium Salt of Ethylene Diamine Tetra (Methylene Phosphonic Acid) can be used as scale and corrosion inhibitor for circulating water and boiler water system, chelating agent in non-cyanide electroplating, water-softening agent in 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.


items index
Appearance Amber transparent liquid White powder
Active content (EDTMP•Na5)% 30.0-32.5 81.4 min
Active content (EDTMPA)% 24.0-26.0 65.0 min
Chloride (Cl-) % 2.0 max 2.0 max
PH 6.0~8.0(as it) 6.0~8.0(1% water solution)
Density (20℃) g/cm3 1.25 min --
Fe,mg/L 20 max 20 max

Package and Storage:

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

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


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

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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