Amino trimethylene phosphonic acid (ATMPA) has excellent chelation, low threshold inhibition, and lattice distortion ability. It can prevent scale formation, calcium carbonate in particular, in a water system. Amino trimethylene phosphonic acid has good chemical stability and it is hard to be hydrolyzed in a water system. At high concentrations, it has good corrosion inhibition.

ATMPA is used in the industrial circulating cool water system of thermal power plant and oil refinery plant. Amino trimethylene phosphonic acid can decrease scale formation and inhibit corrosion of metal equipment and pipeline. ATMPA can be used as a chelating agent in woven and dyeing industries and as a metal surface treatment agent.

The solid-state of amino trimethylene phosphonic acid is crystal powder, soluble in water, easily deliquescence, suitable for usage in winter and freezing districts. Because of its high purity, it can be used in woven & dyeing industries and as a metal surface treatment agent.

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Molecular Formula:


Molecular Weight:


Structure Formula:

ATMP structure formula


Item Standard Solid
Appearance Clear, colorless to pale yellow aqueous solution White crystal powder
Active acid, % 50.0-51.0 95.0 Min.
Chloride (as Cl), % 1.0 Max. 1.0 Min.
pH value (1% solution) 2.0 Max. 2.0 Max.
Fe, mg/L 10.0 Max. 20.0 Max.
Density (20°C), g/cm3 1.31-1.35
Colour APHA, Hazen 30 Max.


ATMP is usually used together with organophosphoric acid, polycarboxylic acid, and salt to built all organic alkaline water treatment agents. ATMP can be used in many different circulating cool water systems. A dosage of 1-20mg/l is recommended. As a corrosion inhibitor, the dosage of 20-60mg/l is preferred.

Packing and Storage:

ATMPA liquid: 200L plastic drum,IBC(1000L),customers’ requirement.

ATMPA solid: 25kg/bag,customers’ requirement.

Storage for ten months in room shady and dry place.

Safety Protection:

Acidity, Avoid contact with eye and skin, once contacted, flush with water.


ATMP, Tris(Methylene Phosphonic Acid) Amine, ATMP scale inhibitor, ATMP chemical, Dequest 2000, Briquest 301 50a,