Specifications copper sulphate pentahydrate purity:98% Cu 25%min Formula: CuSO4.5H2O HS Code: 2833250000 CAS No.: 7758-99-8 Item Stardard CuSO4.5H2O 98%Min Cu 25%Min Pb 10ppm Max Cd 10ppm Max As 5ppm Max Fe 2ppm Max