Magnesium Sulphate

Commonly known as "epsom salt", it is traditionally used as a beauty product. Athletes use it to soothe sore muscles, while gardeners use it to improve crops. It has a variety of other uses covering several industries.


Molar Weight120.34 g/mol (anhydrous), 246.47 g/mol (heptahydrate)
Melting Point1124°C (anhydrous, decomposes), 150°C (heptahydrate, decomposes)
Density2.66 g/cm3 (anhydrous), 1.68 g/cm3 (heptahydrate)
FormsPowder, White, Odourless

Uses and Applications

Key applications

  • Fertiliser
  • Agricultural
  • Pharmaceuticals


  • Pharma
  • Coatings & Construction
  • Cosmetics
  • Water Treatment
  • Food
  • Animal Nutrition
  • Agrobusiness
  • Lubricants
  • Rubber

Synonyms: Bath salt, Bitter salt, English salt, Epsom salt, MAG

Chemical Formula: MgSO4; MgSO4.7H20

CAS Number: 7487-88-9 (anhydrous), 10034-99-8 (heptahydrate)