Amino Trimethylene Phosphonic Acid (ATMP)

Basic Info:

  • Chemical Synonym(s): ATMPA; nitrilotrimethylenephosphonic acid; N,N,N-triphosphonomethyl amine; dowelll37; ntpo
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  • CAS Number: 6419-19-8
  • Chemical Formula:


  • MSDS: Download


Melting point
~215 °C (dec.)
Boiling point
746.2±70.0 °C(Predicted)
1.3 g/mL at 25 °C
Stable. Incompatible with bases, strong oxidizing agents.
Appearance & Physical State
Colourless liquid
Flash Point
Molecular Weight
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Amino Trimethylene Phosphonic Acid (ATMP) is a white amorphous powder. It is a low viscosity, non-toxic and non-flammable liquid with high biocidal efficiency and relatively low cost.

ATMP is easy to be hydrolyzed in water and can replace some toxic phosphates. Amino trimethylene phosphonic acid (ATMP) is an organophosphate derivative of phosphonic acid, used as a flame retardant in many plastics and other products.

It is produced by the reaction of phosphorous pentoxide with formaldehyde and ammonia in an aqueous solution. It can dissolve in water and most organic solvents. ATMP is soluble in water and acts as an acidity regulator in many industries.


Applications of ATMP include flame retardants, additives in the plastic industry, corrosion inhibitors, and wastewater treatment.

In the fire, it both suppresses the combustion and acts as a water repellent, inhibiting water flow from the atmosphere to the fuel source.

It is mainly used in industrial wastewater treatment, including textile dyeing wastewater, printing and dyeing wastewater, active and reactive dyes, and polluted industrial wastewater. It is also used in color lakes and purification of petroleum refining wastewater, etc.

ATMP is used in the production of white pigment and textile process fields for non-chlorine bleaching and also used in organic synthesis and the fields of medicine and chemical industry for dispersant and catalyst.

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