1.Chemical Formula: ZnSO4·7H2O/ ZnSO4·H2O 2.Molecular Weight: 287.56/179.47 3.CAS No.: 7446-20-0/7446-19-7 4.HS Code: 28332930 5.UN NO.: 3077 Class Feed additives, trace elements for animals; Agricultural fertilizers & fungicides; Electroplating & water treatment; Non-ferrous metal flotation reagents; Manufacture other zinc salts.