Specification Magnesium sulfate heptahydrate (technical grade): Appearance White small granular Main content 99.5% min MgSO4 48.59% min MgO 16.27% min Mg 9.81% min PH(5W/V%Sol) 5-8 Ferron(Fe) 0.0015% max Heavy metal (Pb) 0.001 %max Arsenic(As) 0.0002% max Insoluble 0.01%max Size (mm) 0.1-1 Magnesium sulfate heptahydrate (USP.BP.CP): Appearance White small granular Main content 99.5% min MgSO4 48.59% min MgO 16.27% min Mg 9.81% min PH(5W/V%Sol) 6-8 Ferron(Fe) 0.001% max Heavy metal (Pb) 0.0008 %max Arsenic(As) 0.0002% max Insoluble 0.01%max Size (mm) 0.1-1 Magnesium sulfate heptahydrate (USP.BP.CP): Appearance White Crystalline Main content 99.7% min MgSO4 48.68% min MgO 16.3% min Mg 9.82% min PH(5W/V%Sol) 6-8 Ferron(Fe) 0.0008% max Heavy metal (Pb) 0.0004%max Arsenic(As) 0.0001% max Insoluble 0.001%max Size (mm) 0.2-3 Magnesium sulfate heptahydrate (USP.BP.CP): Appearance White cylinder crystalline Main content 99.8% min MgSO4 48.73% min MgO 16.32% min Mg 9.83% min PH(5W/V%Sol) 6-8 Ferron(Fe) 0.0008% max Heavy metal (Pb) 0.0004%max Arsenic(As) 0.0001% max Insoluble 0.001%max Size (mm) 1-4 Magnesium sulfate pentahydrate (USP.BP.CP): Appearance White powder Main content 99% min MgSO4 56% min MgO 19% min Mg 11.31% min PH(5W/V%Sol) 6-8 Ferron(Fe) 0.001% max Heavy metal (Pb) 0.0008 %max Arsenic(As) 0.0002% max Insoluble 0.01%max Size (mm) 0.2