Ammonium Polyphosphate

Other Trading Names:

  • Polyphosphoric acids
  • Ammonium salts
  • APP

CAS Number: 68333-79-9

HS Code: 2835399000

Types of Packaging:

  • 25 Kg /Bag
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Availability: In stock
Ammonium Polyphosphate

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Chemical Name

Ammonium Polyphosphate



Molecular Formula


CAS Number



White Powder

Grade Standard

Industrial Grade


Soluble in Water

Melting Point

155 °C (311 °F; 428 K) decomposes

Boiling Point



1.619 g/cm³

Chemical Description

  • Ammonium Polyphosphate (APP) is a type of polyphosphate salt formed by the reaction of ammonia with phosphoric acid. It is represented by the molecular formula (NH4PO3)n, where "n" signifies the degree of polymerization, indicating the number of monomeric units in the polymer chain.
  • APP appears as a fine, white crystalline powder and is known for its excellent flame retardancy and low water solubility, making it a valuable ingredient in various applications.
  • In the realm of fire safety, Ammonium Polyphosphate is a key component in intumescent coatings and fire-retardant treatments for textiles, woods, and plastics. Upon exposure to heat, it decomposes and promotes charring, which forms a protective barrier that inhibits flame spread and smoke development.
  • It plays a pivotal role in the agricultural sector as a slow-release nitrogen and phosphorus fertilizer. Its polymeric structure allows for the gradual release of nutrients, enhancing plant uptake efficiency and reducing the risk of leaching into groundwater.
  • In the field of flame retardant materials, APP is utilized in the manufacture of thermoplastics, thermosets, and rubber compositions. It imparts enhanced flame resistance to these materials without compromising their physical properties.
  • The construction industry benefits from APP's use in flame retardant paints, coatings, and sealants, providing essential fire protection to buildings and structures while meeting safety regulations.
  • In water treatment processes, Ammonium Polyphosphate serves as a corrosion inhibitor and scale remover. Its ability to sequester metal ions helps in preventing corrosion and scale formation in water systems.
  • As a component of fire-extinguishing compositions, APP contributes to the effective suppression of fires by breaking down and releasing flame-inhibiting compounds.
  • Its environmental profile is favorable due to its non-toxicity and biodegradability, aligning with the growing demand for eco-friendly fire retardant solutions.
  • Ammonium Polyphosphate's unique chemical properties and versatility make it indispensable in industries focused on fire safety, agriculture, and beyond. Its application spans from enhancing fire resistance in materials to contributing to sustainable agricultural practices, highlighting its multifaceted utility and importance in modern technological and environmental solutions.
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Ammonium Polyphosphate