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Ammonium polyphosphate

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Ammonium polyphosphate is an inorganic polymer with a branched structure - an ammonium salt of polyphosphoric acid, a fine white powder, non-flammable, non-toxic, slightly soluble in water.

When heated to temperatures of about 250 - 280 ° C (depending on the degree of polymerization), ammonium polyphosphate is capable of endothermic decomposition with the formation of polyphosphoric acid and the release of ammonia,

and therefore finds use as an independent halogen-free flame retardant and also an acid and gas-forming component intumescent fire retardant formulations.

Typically, to achieve a synergistic effect, ammonium polyphosphate is formulated with pentaerythritol and / or melamine.

Synonyms and international name

APP, ammonium polyphosphate


  • in the production of fire retardant intumescent paints, varnishes and sealants for coatings of metal structures, cables and wood;

  • in the production of products on a wooden basis (chipboard, fiberboard, plywood);

  • in the synthesis of a wide range of resins and plastics with reduced combustibility, flammability, smoke-forming ability, toxicity of combustion products and with reduced flame spread over the surface;

  • in the production of fire-resistant compounds based on rubbers, rubbers, artificial leather, lubricants.

Used with this product

- Melamine

- Pentaerythritol