Zinc Sulphate USP

Zinc Sulphate also known as white vitriol is an inorganic compound that occurs in anhydrous, monohydrate, hexahydrate and heptahydrate forms. It has the formula ZnSO4 as well as any of three hydrates. It was historically known as “white vitriol”. All of the various forms are colorless solids. The heptahydrate form is commonly encountered.


The hydrates, especially the heptahydrate, are the primary forms used commercially. The main application is as a coagulant in the production of rayon. It is also a precursor to the pigment lithopone. It is also used to supply zinc in animal feeds, fertilizers and agricultural sprays, to control moss growth on roofs, as an electrolyte for zinc plating, as a mordant in dyeing, as a preservative for skins and leather and in medicine as an astringent and emetic.


Chemical Name: Zinc Sulphate
Mol. Formula: ZnSO4.7H2O
Mol. Weight: 287.56 g/mol
CAS No: 7446-20-0


General Specifications

Test Specification
Characters It occurs as a white, granular, crystalline powder.




(a)   Test for zinc


(b)   Test for sulfate

Solubility Very soluble in water, freely soluble in glycerin, insoluble in alcohol
Acidity Specified test
Arsenic Not more than 14ppm
Lead Not more than 20 ppm
Alkalies and alkaline earths The weight of the residue is NMT 5mg (0.9%)
Residual solvents Meets the requirements
Assay Not less than 55.6% and not more than 61.0% of ZnSO4


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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