... .Mainly used for foliar fertilization 3.transparent crystal Magnesium Sulphate HeptahydrateMOLECULAR FORMULAR: MgSO4.7H2OCAS10034-99-8SPECIFICATION:HG/T 2680 ... directly used as fertilizer for rubber, palm trees ;2. In industries: used in tanning, porcelain, pigment, match, fireproof materials, Mg-salt ... 0.50.5Pb ,%,≤11Water insoluble,%,≤0.050.05 Magnesium Sulphate Heptahydrate used in food, Medicine