Powder grade specifications: 1) Magnesia: *7% min 2) Water-solubility magnesia: *4% min 3) Sulphur: *0% min 4) Moisture: 3% max Granular grade specifications: 1) Magnesia: *5% min 2) Water-solubility magnesia: *1% min 3) Sulphur: *6.7 min 4) Moisture: 5% max 5) Granularity: a) Small: 0.**2mm b) Great: **4mm Magnesium sulphate heptahydrate industrial grade: 1) MgSO**7H2O: *9.3% min 2) Mg2+: 9.8% min. 3) Cl-: 0.1% max. 4) Fe2+: 0.***5% max. 5) MgSO4: *8.*4% min. Outer packing: *5kg / *0kg