Magnesium sulphate heptahydrate (Agriculture 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) 0.002% max
Chloride(CL) 0.002%
Heavy metal (Pb) 0.001 %max
Arsenic(As) 0.0002% max
Insoluble 0.01%max
Size (mm) 0.1-1 0.2-3 1-4
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