Phosphorus Pentoxide

Phosphorus pentoxide is a phosphorous oxide. Phosphorus pentoxide is used as a strong drying and dehydrating agent. Many reactions that require the removal of a water molecule can utilize P2O5 such as the dehydration of amides to nitriles. It is primarily used in making optical glass and heat-insulating glass. In addition, phosphorus pentoxide is a key ingredient to produce pharmaceuticals and pesticides in the pharma and agricultural industry.


Molar Weight283.88 g/mol
Melting Point340 °C
Boiling Point360 °C
Density2.39 g/cc
FormsPowder (amorphous), White, Crystalline

Uses and Applications

Key applications

  • Metal working
  • Glass
  • Oil and Gas
  • Agricultural
  • Catalysts


  • Oil & Gas
  • Cleaning
  • Coatings & Construction
  • Polymers
  • Cosmetics
  • Chemical Processing

Synonyms: Phosphoric anhydride, Diphosphorus pentoxide, Phosphorpentoxid, Tetraphosphorus decaoxide, Phosphoric acid anhydride, Phosphoric oxide, Phosphorous pentoxide, PPO

Chemical Formula: O10P4

CAS Number: 1314-56-3