Magnesium Chloride

Magnesium chloride is an inorganic compound represented by the formula MgCl2, and it exists in various hydrated forms. Anhydrous MgCl2 contains approximately 25.5% elemental magnesium by mass. The hydrated forms of magnesium chloride can be obtained from brine or seawater sources. In its natural mineral state, known as bischofite, it is extracted through solution mining from ancient seabeds, such as the Zechstein seabed in northwest Europe. Anhydrous magnesium chloride serves as the primary precursor for the production of magnesium metal, while hydrated magnesium chloride is the more readily accessible form.

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
  • CASE & Construction
  • Polymers
  • Beauty & Personal Care
  • Water Treatment
  • Food & Nutrition
  • Animal Nutrition
  • Agriculture
  • Lubricants
  • Chemical Processing