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Ferrous Sulphate Heptahydrate Chemical formula: FeSO4.7H2O HS No.: 28332910 CAS No.: 7782-63-0 EINECS No.: 231-753-5 Standards: HG/T2935-2006 Appearance: Light green crystal Purity: 90%, 95%, 98%, 99% according to customer's requirement.