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CAS#: 7487-88-9 | Formula: MgSO4 | Specifications: Assay 97 % - Min, Calcium 0.04 % Max, Chloride 0.001 % Max, Heavy Metals (by ICP-OES) 0.001 % Max, Iron 0.001 % Max, Loss on ignition 2.0 % Max, Manganese 0.001 % Max, Nitrate 0.005 % Max