Phosphorus pentoxide is a chemical compound with molecular formula P4O10 (with its common name derived from its empirical formula, P2O5). It is used in a wide variety of applications as a building block and a reagent in the chemical industry. This white fine powder is the anhydride of phosphoric acid. It is a powerful desiccant and dehydrating agent.

P4O10 is prepared by burning tetraphosphorus with sufficient supply of oxygen:
P4 + 5 O2 → P4O10

SynonymsPhosphoric anhydride
Phosphoric oxide
CAS no.1314-56-3
EINECS no.215-236-1
Molecular formulaP2O5
Molecular weight141.94

Applications – Phosphorus pentoxide is a versatile compound and used in wide range of applications:

Organic synthesisIt can be used as a reagent for condensations in organic synthesis and polymerisation reactions. Typical uses include cyclisation / ring closures in such reactions as acetylation, alkylation, production of amines, acid amides, cyclic ketones, cyclic olefins or oxygen and sulphur heterocyclic compounds.
Catalyst productionIt can be used in the manufacture of special phosphoric acid supported catalysts.
Specialty inorganic phosphatesPhosphorus pentoxide can be used in the manufacture of specialty sodium and ammonium phosphates.
Polyphosphoric acidsVarious grades of superphosphoric and polyphosphoric acids can be manufactured by blending phosphorus pentoxide with phosphoric acid.
GlassBeside silicon dioxide and boron trioxide also phosphorus pentoxide is used for glass making.
Phosphate estersIt can be used to produce phosphate esters with a mono/di ester content. The acid is reacted directly with the appropriate alcohol or phenol to produce the acidic phosphate ester.
Drying agentBecause of its strong hygroscopic properties phosphorus pentoxide can be used as a drying agent.
FertilizersIn production of ammonium polyphosphate.
SurfactantsIn manufacture of cetyloleyl ether phosphoric acid, cetylstearyl ether phosphoric acid, nonylphenol ether phosphoric acid.


AppearanceFine white powder (Hygroscopic)
Assay%Min 99.50
P2O3 content%Max 0.10

Keep container tightly closed in a dry and well-ventilated place. Store in cool place.

200 kg UN approved MS Drum.

REACH Status
P2O5 offered by ExSyn is registered under EU REACH regulations.

ExSyn offers P2O5 on commercial scales and welcomes enquiries. No matter the quantity you need, our exceptional quality and service will make ExSyn your supplier of choice! If you need any additional information or SDS, please get in touch with us.

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