Magnesium Sulfate BP

Magnesium sulfate is an inorganic salt with the formula MgSO4(H2O)x where 0≤x≤7. It is often encountered as the heptahydrate sulfate mineral epsomite (MgSO4·7H2O), commonly called Epsom salt.


Magnesium sulfate is a common mineral pharmaceutical preparation of magnesium, commonly known as Epsom salt, used both externally and internally. Magnesium sulfate is used as a brewing salt in making beer. It may also be used as a coagulant for making tofu.


Chemical Name: Magnesium Sulfate
Mol. Formula: MgSO4.7H2O
Mol. Weight:   246.5 g/mol
CAS No: 10034-99-8
Other name: Epsom Salt



Test Specification
Characters It occurs as a white, crystalline powder or brilliant, colorless crystals

Test (A)

Test (B)


(a)It gives the reaction of sulfates

(b)It gives the reaction of magnesium

Solubility Freely soluble in water, very soluble in boiling water, practically insoluble in ethanol (96%)
Appearance of solution The solution is clear and colorless
Acidity or alkalinity Specified test
Chlorides Not more than 300 ppm
Arsenic Not more than 2 ppm
Iron Not more than 20 ppm
Heavy Metals Not more than 10 ppm
Loss on drying 48.0% to 52.0%
Assay Not less than 99.0% and not more than 100.5% (dried substance)


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


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We observe WHO Good manufacturing practice and Good laboratory practice.

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