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| Section2 = {{Chembox Properties
| Formula = [NH<sub>4</sub>PO<sub>3</sub>]<sub>n</sub>(OH)<sub>2</sub
| MolarMass = 97.01 g/mol
| Appearance = white powder
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'''Ammonium polyphosphate''' commercially produced by [[Clariant]], (former business area of [[Hoechst AG]]), Budenheim and other sources is an inorganic salt of [[polyphosphoric acid]] and [[ammonia]] containing both chains and possibly branching. Its chemical formula is [NH<sub>4</sub> PO<sub>3</sub>]<sub>n</sub>(OH)<sub>2</sub> showing that each [[monomer]] consists of an [[orthophosphate]] radical of a [[phosphorus]] atom with three [[oxygen]]s and one negative charge neutralized by an [[ammonium]] [[cation]] leaving two bonds free to [[polymerize]]. In the branched cases some monomers are missing the ammonium anion and instead link to three other monomers.
The properties of ammonium polyphosphate depend on the number of monomers in each molecule and to a degree on how often it branches. Shorter chains (n<100) are more water sensitive and less thermally stable than longer chains (n>1000),<ref>[http://www.sinoharvest.com/products/Ammonium-Polyphosphate.shtml]</ref> but short polymer chains (''e.g.'' pyro-, tripoly-, and tetrapoly-) are more soluble and show increasing solubility with increasing chain length.<ref>{{cite patent|US|4041133}}</ref>
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