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Magnesium Sulfate/Magnesium Sulphate

Formula: MgSO4

HS Code (Magnesium Sulphate):28332100


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. The overall global annual usage in the mid-1970s of the monohydrate was 2.3 million tons, of which the majority was used in agriculture.

Epsom salt has been traditionally used as a component of bath salts. Epsom salt can also be used as a beauty product. Athletes use it to soothe sore muscles, while gardeners use it to improve crops. It has a variety of other uses: for example, Epsom salt is also effective in the removal of splinters.

Physical properties

Magnesium sulfate exists as an odorless, white crystalline solid with a density of 2.66 g/mL, and melting point of 1,124°C.

The monohydrate form of magnesium sulfate has a density of 2.45 g/mL, and melting point of 200°C.


Chemical properties

MgSO4 is highly soluble in water, and is also extremely hygroscopic (absorbs moisture from atmosphere). It can absorb large amounts of water in its anhydrous form (dry, without any water molecules), and is an important laboratory desiccant. It is stable at normal conditions. When heated to high temperatures, it decomposes to give toxic fumes of sulfur oxides.


Magnesium sulfate has many medical and household uses such as in bathing salts, beauty products, anticonvulsants, muscle relaxants, laxative and electrolyte source (of Mg, an essential nutrient), among others. It also has important industrial applications such as electrolyte, bleaching agent, desiccant, absorbent, fertilizer, brewing salt, etc.

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