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CAS Number: 7446-20-0
Zinc Sulphate Heptahydrate 21% is a water-soluble zinc salt supplied as colourless to white crystals or crystalline powder. It contains a minimum of 21% elemental zinc expressed as Zn and has the molecular formula ZnSO₄·7H₂O, CAS number 7446-20-0 and molecular weight of approximately 287.56 g/mol. The product is used as a source of zinc and sulphur in agricultural micronutrient formulations, fertilizer manufacturing, fertilizer blending, soil-treatment programmes and selected industrial chemical applications. The stated 21% specification refers to elemental zinc content as Zn and should not be interpreted as product purity. Pure Zinc Sulphate Heptahydrate theoretically contains approximately 22.73% elemental zinc, while commercial fertilizer-grade material commonly guarantees a lower minimum zinc content to account for permitted moisture and impurities. Agricultural-grade Zinc Sulphate Heptahydrate may be supplied against applicable Indian fertilizer specifications, subject to confirmation through the latest batch-specific Certificate of Analysis and regulatory documentation. Buyers should verify zinc, sulphur, water-insoluble matter, pH, lead, cadmium, arsenic, copper, magnesium, iron and moisture before use. Mangalam Acid & Chemicals supplies Zinc Sulphate Heptahydrate 21% from Vapi, Gujarat, India, for bulk agricultural, fertilizer-manufacturing and industrial requirements. Buyers can request a quotation, Safety Data Sheet and batch-specific Certificate of Analysis.
| Molecular Formula | ZnSO₄·7H₂O |
| Appearance | White crystalline powder |
| Zinc (Zn) Content | 21.0% minimum |
| Purity | As per batch-specific COA |
| pH (5% solution) | As per batch-specific COA |
Fields marked [Admin-editable] are maintained in the CMS and confirmed per batch. Contact us for specific grade requirements.