Other Uses:

Magnesium chloride is used for a variety of other applications besides the production of magnesium: the manufacture of textiles, paper, fireproofing agents, cements and refrigeration brine, and dust and erosion control.
Mixed with hydrated magnesium oxide, magnesium chloride forms a hard material called Sorel cement.

Specification:

Formula: MgCl2.6H2O
Magnesium Chloride (MgCl2): 47%
Calcium Chloride (CaCl2): 2.2% max
Sodium Chloride (NaCl): 0.9% max
Potassium Chloride (KCI): 0.6% max
Water of Crystallization: up to 100%
Sulphates (SO4): 0.025%
Magnesium Oxide (MgO): 0.1% max
Iron (Fe): 10 ppm max
Heavy Metals (Pb, Hg): 0.1 ppm max
Arsenic (As): 0.1 ppm max
Cadmium (Cd): 0.01 ppm max
pH of Aqueous Solution: 8.2