1.use for fertilizers 2.The factory has passed the ISO 9001 ... .High cost performance Fertilizers Magnesium sulfate heptahydrate 99% ,99.5% Use:Mainly used in fertilizer, tanning, pringting and dyeing,activator,papermaking ... (as Cl)chloride%≤ 0.15≤0.15insoluble in water%≤0.1≤0.1