Magnesium Chloride

Magnesium chloride is an inorganic compound with the formula MgCl2 and its various hydrates. Anhydrous MgCl2 contains 25.5% elemental magnesium by mass. The hydrated magnesium chloride can be extracted from brine or sea water. As the natural mineral bischofite it is extracted (by solution mining) out of ancient seabeds, for example, the Zechstein seabed in northwest Europe. Anhydrous magnesium chloride is the principal precursor to magnesium metal. Hydrated magnesium chloride is the form most readily available.

Magnesium dichloride, Magnesium(2+) dichloride, E511
Chemical Formula
CAS Number
7786-30-3 (anhydrous), 7791-18-6 (hexahydrate)


Molar Weight
203.3 g/mol (hexahydrate)
Melting Point
118°C (hexahydrate)
Boiling Point
1,412°C (anhydrous)
Flash Point
non flammable
1.569 g/cm³ (hexahydrate)
Liquid, White, Crystalline

Uses and Applications

Key applications

  • Plastics and polymers
  • Wastewater treatment
  • Food additive
  • Water treatment
  • Agricultural
  • Pharmaceuticals
  • Household industrial
  • Animal feed
  • Cosmetic products
  • Medical products


  • Pharma
  • Cleaning
  • Coatings & Construction
  • Polymers
  • Cosmetics
  • Water Treatment
  • Food
  • Animal Nutrition
  • Agrobusiness
  • Lubricants
  • Chemical Processing