Ethylene Diamine Tetra (Methylene Phosphonic Acid) Sodium Salt
CAS Number: 7651-99-2
Molecular Formula: C6H15N2O12P4Na5
Molecular Weight: 546
EDTMPA.5Na is a neutral solid product. It is nitrogenous organic polyphosphonic acid, which is a part of cathodic corrosion inhibitor. EDTMPA.5Na can be fully dissolved in water, innocuous and none pollution to environment, has good chemical stability and thermal tolerance. EDTMPA.5Na has good scale inhibition property under temperature 200°C. EDTMPA.5Na 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. EDTMPA.5Na shows better scale inhibition effects to calcium sulfate and barium sulfate.
EDTMPA.5Na 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 EDTMPA.5Na is slightly easy to deliquescence, convenient in transportation and suitable for usage in winter and freezing districts.
Pale yellow liquid
Active Acid (%)
24.0 - 26.0
Active Salt (%)
30.0 - 32.6
pH (neat solution) @ 25°C
6.0 - 8.0
Iron, as Fe (ppm)
Specific Gravity @20/20°C
Chloride (as Cl-, %)
Package and Storage:
Normally in 200L HDPE drum and 1000L IBC.
Storage for 12 months in room shady and dry place.
Avoid contact with eye and skin, once contacted, flush with plenty water.