Zinc sulphate heptahydrate is a colourless to white crystalline salt widely used as a highly soluble source of zinc. It is essential in agriculture, pharmaceuticals, water treatment, and general chemical manufacturing. In fertilisers, it supplies bioavailable zinc for correcting micronutrient deficiencies in crops. Its purity, solubility, and predictable zinc content make it equally important in animal nutrition and feed premixes.

Industrial applications include mordanting in textiles, galvanizing auxiliaries, coagulation processes, and preparation of zinc-based chemicals. It also serves in pharmaceuticals as an approved zinc supplement and in various analytical procedures.
Product grade should be selected based on impurity thresholds, especially for food, pharma, and feed applications where heavy metal limits are tightly regulated.