Magnesium sulphate HEPTA: 1> 99.5% main content 2> Appearance: white crystal 3> Application: mainly used in food, fertilizer, agriculture, industry, leather, dyeing, painting, ceramic 4> Technical analysis: Fe: 0.02%; Cl: 0.05%; MgO: 16%; insoluble water: 0.02% 5> Packing: 25kg net plastic woven bags