Appearance White granular Main content99.5% min MgSO4 48.59% min MgO 16.24% min Mg 9.8% min PH(5W/V%Sol) 5-9 Ferron(Fe) 0.0015% max Chloride(Cl) 0.015% max Heavy metal (Pb) 0.0008%max Arsenic(As) 0.0002%max Insoluble 0.01% max Size (mm) 0.1-1 0.2-3 1-4