1.use for fertilizers 2.The factory has passed the ISO 9001 and FDA 3.High cost performance Fertilizers Magnesium sulfate heptahydrate 99% ,99.5% Use:Mainly used in fertilizer, tanning, pringting and dyeing,activator,papermaking,plastic,porcelain,pigment matchmaking ,dynamite and fireproof materials making . Can used in pringting and dyeing delaine as the aggravating reagent of calico or silk,and ...