Amino Trimethylene Phosphonic Acid, ATMP Chemical

Production Info:

The three main raw materials for ATMP production are phosphorous acid, ammonium chloride, and formaldehyde. The first two are added to the reactor, heated, and stirred until completely dissolved.

Then, formaldehyde will be dropwise. Phosphorus acid can be from the hydrolysis of PCl3 or the production of other chemicals. If chlorine content needs to be lower than the normal specs, the steam-heating time will be extended.

CAS No.:


Molecular Formula:


Molecular Weight:


Structure Formula:



Amino trimethylene phosphonic acid has excellent chelation. Its threshold inhibition is low, and chemical stability is high. ATMP is an excellent antiscalant and chelating agent to most metal ions like Ca, Ba, Mg, Fe, and Pb, especially Calcium Carbonate (CaCO3). It is difficult to hydrolyze in the water system and can distort the lattice. In a higher concentrated system, ATMP is also a good corrosion inhibitor.

ATMP acid is used in industrial circulating cool water systems of thermal power plants and oil refinery plants. ATMP can decrease scale formation and inhibit the corrosion of metal equipment and pipeline. In addition, ATMP acid can be used as a chelating agent in woven and dyeing industries and as a metal surface treatment agent.

Usually, it is compounded with organophosphorus acid/salt and polycarboxylic acid/salt. Amino trimethylene phosphonic acid, solid as crystal powder, can also be supplied for cold areas, particularly in water. It is easy to dissolve. ATMP is suitable for usage in winter and freezing districts. Because of its high purity, ATMP can be used in woven & dyeing industries and as a metal surface treatment agent.


AppearanceColorless or pale yellow transparent liquid White crystal powder
Active Acid, %48.0~52.095 Min.
Chloride (as Cl), %2.0 Max.2.0 Max.
Fe, mg/L20.0 Max.20.0 Max.
Density (20℃), g/cm31.30 Min.
Density (20℃), g/cm31.40 Min.
Colour APHA (Hazen)40 Max.


ATMP is usually used with organophosphorus acid, polycarboxylic acid, and salt to build all organic alkaline water treatment chemicals. Amino trimethylene phosphonic acid is broadly applied in recirculated cooling water systems for power stations, oil fields, central air-conditioning, etc.

It is also used in the woven and dyeing industry. The recommended dosage is 1~20 mg/L as an antiscalant and chelating agent. This will increase to 20~60 mg/L and is used as a corrosion inhibitor.

Packing and Storage:

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

200L plastic drum 1000L IBC

Solid: 25kg/bag, customers’ requirement.

weaved plastic bag

Storage for ten months in a shady room and dry place.

Safety Protection:

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

Transport Info:

Corrosive. IMO class 8, UN 3265.


ATMPA, ATMP(A), Tris(Methylene Phosphonic Acid) Amine, Dequest 2000, Mayoquest 1320, Belclene 640, Unihib 305, Excel Codex 8503, Briquest 301-50A.