Magnesium sulpate is an inorganic salt containing magnesium, sulfur and oxygen, with the formula MgSO4. It is often encountered as the heptahydrate sulfate mineral epsomite (MgSO4•7H2O), commonly called Epsom salt.

  • Formula: MgSO4
  • Molar mass: 120.366 g/mol
  • Melting point: 1,124 °C
  • IUPAC ID: Magnesium sulpate
  • Density: 2.66 g/cm³
  • Soluble in: Water


  • Epsom salts are used as bath salts
  • Uses in Cosmetics
  • Pharmaceutical application
  • As a fertilizer
  • Industrial application
  • As a Feed Additives


Free flowing -crystalline form
Matter insoluble in water, per cent by weight, maximum 1.0
Magnesium {as Mg), per cent by weight, minimum 9.6
Lead (as Pb), percent by weight, maximum 0.003 (v) pH (5% solution) 5.0-8.0
Sulphur (asS),percent by weight, minimum 12.0

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