... main contain 99.5%min Mg9.81%min 99.5% Industry grade Magnesium Sulphate MgSO4.7H2O Magnesium sulphate heptahydrate used as ... production is 100tons).This product can be used in feed, food, industry, dye, ceramics, cosmetics, papermaking, fertilizer, agriculture,etc, if you donot ... countries, so please donot worry about the quality. 99.5% Industry grade Magnesium Sulphate MgSO4.7H2O