... mgso4.7h2o Free flowing crystal Assay:99.5% MgO:16.0%min fertilizer magnesium sulphatemagnesium sulphate mgso4.7h2oApplication: --Mainly used in ... fertilizer, tanning, pringting and dyeing,activator,papermaking,plastic,porcelain,pigment matchmaking ... Assay≥99.5%3 MgO≥16.0%4 Cl≤0.1%5 Mg≥9.8%6 S≥12.5% fertilizer magnesium sulphate