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.

More Products
In Focus: Cetylpyridinium chloride monohydrate
Products in focus · 28/02/2024

Cetylpyridinium chloride is the chloride salt form of cetylpyridinium, a quaternary ammonium with broad-spectrum antimicrobial activity. Upon topical administration, cetylpyridinium chloride is positively charged and reacts with the negatively charged microbial cell surfaces, thereby destroying the integrity of the cell membrane.

In Focus:N2-isobutyryl-2′-OMe-guanosine
Products in focus · 20/02/2024

N2-Isobutyryl-2′-O-methyl-guanosine (IBG) is a modified nucleoside that has gained significant attention in recent years due to its potential therapeutic and industrial applications. IBG is a derivative of guanosine, a nucleoside that is a building block of RNA and DNA.

In Focus: Trimethylaluminium, 2M in Toluene
Products in focus · 13/02/2024

Trimethylaluminium belongs to class of organometallics. It is a highly reactive chemical and its solution in toluene is normally used to facilitate workability. Its general applications are in cross coupling and carboalumination reactions.

In Focus : Octenidine Dihydrochloride
Products in focus · 06/02/2024

Octenidine dihydrochloride is a cationic surfactant, with a gemini-surfactant structure. Since 1987, it has been used primarily in Europe as an antiseptic prior to medical procedures, including on neonates. It is safe to handle and chemically stable.

In Focus : Allyl Glycidyl Ether
Products in focus · 30/01/2024

Allyl Glycidyl Ether (AGE) is a multifunctional organic intermediate made from epichlorohydrin and allyl chloride and is featured by high functionality and low chlorine content. Since it has an epoxy group and an allyl group, AGE reacts with a wide range of compounds.

In Focus : L-Fucose
Products in focus · 23/01/2024

L-Fucose is a colourless solid that belongs to class of deoxy sugars and is considered as one of the essential sugars for smooth functioning of the body. It occurs naturally in brown algal polysaccharide fucoidan and gums.

In Focus : Liposomal Iron
Products in focus · 16/01/2024

Liposomal iron involves encapsulating iron molecules within lipid bilayers. This encapsulation protects the iron from interactions with other compounds, enhance its stability, improve its bioavailability and low incidence of side effects.

In Focus – Polyethylene Glycol (PEG) – Pharma Grade
Products in focus · 09/01/2024

Polyethylene glycols (PEG), also known as macrogols, are liquid or solid polymers of the general formula H(OCH2CH2)n OH, where n is greater or equal to four.

In Focus : Arachidonic Acid
Products in focus · 19/12/2023

Arachidonic acid is an omega-6 fatty acid. The compound is abundant in liver, brain, and depot fats of animals. It is also found in chicken, egg, fish, and human mother milk.