Di Ammonium Phosphate

Diammonium phosphate is one of a series of water-soluble ammonium phosphate salts that can be produced when ammonia reacts with phosphoric acid. DAP is used as a fertilizer. When applied as plant food, it temporarily increases the soil pH, but over a long term the treated ground becomes more acidic than before upon nitrification of the ammonium. DAP can be used as a fire retardant. It lowers the combustion temperature of the material, decreases maximum weight loss rates, and causes an increase in the production of residue or char.


Molar Weight132.06 g/mol
Melting Point155 °C
Density1.619 g/cc
FormsCrystals, White

Uses and Applications

Key applications

  • Flame retardant
  • Wine production
  • Fertiliser
  • Animal feed


  • Food
  • Agrobusiness

Synonyms: Ammonium di(lauryl) phosphate, ammonium didodecyl phosphate, SCHEMBL1204896, Ammonium Phosphate Dibasic, DAP, Diammonium Hydrogen Phosphate, Diammonium Phosphate, E 342, Phosphoric Acid, Diammonium Salt

Chemical Formula: (NH4)2HPO4

CAS Number: 7783-28-0