Magnesium Sulphate Heptahydrate (MgSO4 7H2O)

Magnesium Sulphate Heptahydrate (MgSO4 7H2O)

Magnesium Sulphate Heptahydrate (Epsom Salt) provides a soluble source of Magnesium and sulfur for plants. Magnesium is a secondary micronutrient. Magnesium is the central atom of the chlorophyll molecule and is therefore important in photosynthesis. Magnesium is important in protein synthesis and enzyme processes, and it helps plants to absorb and use phosphorous and nitrogen

Sulfur is a component of amino acids and proteins. It is important in plant metabolic functions and enzyme processes. Sulfur-containing components help regulate ion transport across bio-membranes and are important in tolerance of plants to salt, drought, and heat. Sulfur-containing components help to detoxify heavy metals in plants. A shortage of sulfur inhibits protein synthesis and decreases chlorophyll content in leaves.

Magnesium Sulphate Heptahydrate can be applied dry to the soil, dissolved and used as a foliar spray or dissolved in hydroponic nutrient solutions. It can be incorporated into fertilizer blends.


MSDS – Safety Datasheet

General Specification

Purity as MgSO47H2O 99.5 % to 99.99 %
Magnesium Sulphate as MgSO4 48.5 % Min
Magnesium Oxide as Mgo 16 % to 17 %
Sulphite as So3 32 % to 33 %
Magnesium as Mg 9.6 % Min
PH of 5% aqueous solution 5.5 to 7.5
Potassium as K 0.1 % Max
Sulphates of K and Ca <0.1% Each
Chlorides of K and Ca <0.1% Each
Chlorides of CI 0.02 % Max
Heavy metals as Pb NDL
Arsenic as As203 NDL
Iron as Fe 20 ppm Max


  • Micronutrient in Agriculture
  • Poultry and Cattle feed
  • Raw Material in Soaps and Detergents
  • Laxative in Medicine
  • Refreshing additive in bath water
  • Fireproof material
  • Paper Industries
  • Pharmaceuticals
  • Coagulant in the manufacture of ABS and other plastics

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