Magnesium sulphate hepta Specs: Purity: 99.5%min Mg: 9.8% Fe: 0.005%max Cl: 0.3%max Pb: 0.0005%max As: 0.0005%max Insoluble in the water0.1max Ph: 6-7 Packing: in 25kgs pp woven bag. Magnesium sulphate hepta Specs: Purity: 96%min Fe: 0.005%max Cl: 0.3%max As: 0.0005%max Insoluble in the water0.1max Ph: 6-7 Packing: in 25kgs pp woven bag. As mentioned above