
Zinc sulfate heptahydrate, commonly known as white alum or zinc alum, is the heptahydrate form of zinc sulfate. Its molecular formula is ZnSO₄·7H₂O, and its molecular weight is approximately 287.55. It appears as a white crystalline powder, is odorless, has an astringent taste, and exhibits astringent properties. It is an important zinc salt.
| Item | Specification |
| Melting Point | 100℃ |
| Boiling Point | >500℃ |
| Density | 1.957 g/cm³ |
| Flash point | N/A |
| Vapor pressure | <1 mmHg(25℃) |
| Refractive index | N/A |
| Water Solubility | 96.5 g/100mL(20℃) |
Agriculture & Animal Feed: Zinc Sulfate Heptahydrate is used as a specialized zinc fertilizer for field crops, fruits, and vegetables to correct zinc deficiency symptoms such as stunted growth and small leaves in crops, as well as to supplement zinc as a trace element in livestock, poultry, and aquaculture feed.
Pharmaceuticals and Personal Care Products: Zinc Sulfate Heptahydrate is used in the preparation of oral zinc supplements and antibacterial eye wash solutions; it also serves as a base ingredient for various zinc-supplementing health foods.
Various Chemical Industry Applications: Heptahydrate zinc sulphate is used for anti-corrosion plating of metal workpieces; in the production of zinc oxide, various zinc salt intermediates, and coagulants for rayon spinning; for corrosion inhibition and algal control in industrial water systems, as well as flocculation and purification of wastewater; and as a mordant in printing and dyeing and as a processing aid in papermaking.
Other Applications: A reagent for routine chemical analysis in laboratories; a wood preservative for immersion treatment; and a functional additive in fire-resistant building materials.
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