Magnesium sulphate heptahydrate

*Main content:99.5%
*MgSO4:48.59%
*MgO:16.27%
*Mg:9.81%
*PH(5W/V%Sol):5-8
*Iron(Fe):0.002%
*Cl:0.02%
*Heavy metal (Pb):0.001%
*As:0.0002%
*Insoluble in water:0.01%
*Granular(mm):0.1-1, 1-3, 2-4