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APP-Ammonium polyphosphate


Chemical Name: Ammonium polyphosphate
CAS No.:68333-79-9
Molecular formula : (NH4PO3)n  (n>1000,50, n<20 water soluble)

Ammonium polyphosphate is a non-halogen and non-toxic flame retardant for plastics and rubber,coatings,paper and timber,painting,wood materials. It acts as flame retardant by intumescence mechanism. When APP is exposed to fire or heat, it decomposes to polymeric phosphate acid and ammonia. The polyphosphoric acid reacts with hydroxyl groups to form a nonstable phosphateester. Following dehydration of the phosphateester, a carbon foam is built up on the surface and acts as an insulation layer.

Technical Index:

Appearance: White flowable powder

P2O5 (w/w): ≥70%

N Content (w/w): ≥14%

Decomposition Temperature (TGA, onset): >275℃

Viscosity  (10% aqueous suspension, at 25℃): <100mpa.s

Solubility  (g/100ml water , at 25ºC): <0.5

pH value  ( 10% aqueous suspension ): 6.5-7.5

Moisture  (w/w): <0.25%

Degree of Polymerization: >1000

Average Partical size (D50): 10µm


Packing & Storage:

Packing in 25kg plastic woven bag with PE liner or other packing as request. Stored in dry and cool place, keeping out of moisture and sunshine, shelf life is  two year.