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Ammonium Polyphosphate (APP)


Synonyms: APP; Polyphosphoric acids, ammonium salts
CAS No.: 68333-79-9
Molecular Formula: (NH4PO3)n
Structural Formula: Ammonium Polyphosphate
Phase II:


Ammonium polyphosphate is industrally manufactured by polycondensation between monoammonium phosphate and urea.


1) Ammonium polyphosphate phase I: an intumescent flame-retardant component for coating, wood, paper, plywood, cable, fiber, plastic, rubber, resin, component of fire-extinguishing dry-powder for fire of forest, oil-well, and coal mine.

2) Very low polymerization degree ammonium polyphosphate (phase I) can be applied as releasing-control fertilizer

3) Ammonium polyphosphate pase II: Due to its low solubility in water, Phase II Ammonium polyphosphate is particularly suitable as an "acid donor" for intumescent flame-retardant paints or coating, which is applied in steel structures, wood/plastic applied in building material, adhesives and sealants, non-halogenated flexible and rigid polyurethane foams, as well as cellulose-contained paper and wood products


  Phase I Phase II, regular (non-treatment) Phase II, Silicane-treated Phase II, Melamine-treated
P content - 31.0%~33.0% 28.0% min. 29.0~31.0%
N content 14~15% 13.0-15.0% 14.0% min. 15.0~17.0%
P2O5 Content 69% min. - - -
 water - 0.25% max 0.25% 1.0% max.
Average Polymerization Degree 70 >1000 >1000 >1000
PH (1% water suspension/solution) 5.5~6.5 5.5-7.5 6.5~7.5 6.5~8.5
PH (10% water Solution) 5.2~6.2 - - -
Water Soluble Matter (25 deg. C, 10% suspension) - 0.5% max. 0.1% max. 0.04% max.
Viscosity in Water (25 deg. C, 10% suspension) - 100 mpa.s max. 20 mpa.s max. 20 mpa.s max.
Density - 1.9g/cm3 1.9g/cm3 1.9g/cm3
Bulk density - ~0.7g/cm3 ~0.7g/cm3 ~0.9g/cm3
Decomposition T - 275 deg C. 300 deg. C min. 300 deg. C min.
Average particle size 325 mesh 8~15 microns 15 microns max. 6~8 microns
Appearance white powder white powder white powder white powder
Application   intumescent coatings, PU foaming, PP, PE, PU, Epoxy resin fabric coatings intumescent coatings

Standard Packaging

25kgs net /paper bag with PE lining bag; 1000kg/supper sacks

900kg boxes for ammonium polyphosphate (inside 25kg/bag)

Risks and Safety Information

Ammonium polyphosphate is not regulated by UN as hazardous substance
May cause slight skin irritation but not irritating to the mucous membranes.
S-Phrase S24/25 Avoid contact with skin and eyes. React with alkaline solutions to form ammonia and can contribute to eutrophication of stagnant waters. For more information, please see MSDS

No Hazard

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