Magnesium Sulphate Heptahydrate

Manufacturing Process

Hot and Cold process technology involving the reaction of Magnesite (Magnesium Carbonate) with Sulphuric Acid followed by standard chemical stages of Settling, Filtration, Evaporation, Crystallization, Drying and Packing.

Physical Properties

  • White free flowing crystals
  • Bitter in taste
  • Neutral to litmus
  • Decomposes at 1124℃
  • Loses 6H2O at 150℃
  • Non-combustible
  • Highly soluble in water and glycerol
  • Sparingly soluble in alcohol
  • Low toxicity


  • In agriculture: as a micro nutrient
  • In process industry: as a catalyst
  • Dietary Supplement and laxative in Animal Health and Feed
  • Detergent industry
  • Refractories
  • Textile industry
  • Ceramics manufacture
  • Weighting of silk
  • Mineral Water
  • Fire-proof materials
  • Paper industries
  • Cosmetics industry

Chemical Analysis

Magnesium Sulphate(as MgSO4)(Calculated with reference to the material dried at 300℃ percent by mass)Min 99%
Magnesium as Mg9.8%
Chlorides (as Cl), percent by massMax 0.05%
Lead as Pb traces
Arsenic as AsNil
Cadmium as CdNil
Iron as FeMax 70 PPM
Matter insoluble in water, percent by mass0.2%
Acidity or AlkalinityNeutral

General Assurance

  • Magnesium Sulphate Heptahydrate is manufactured using acceptable industrial practices.
  • The material is guaranteed to meet the above-specified chemical and physical properties.


Normally Magnesium Sulphate Heptahydrate is packed in 25 kg Multicolour strong Woven Ploypropylene bags.

Available sizes include jumbo bags (1.1Mts), 50 kg and 25 kg HDPE bags, as per customer requirements.