... . 1. Uses: in agriculture: mainly used in mixed fertilizer or directly used as fertilizer for rubber, palm trees ;2. In industries: used ... in food, pharmaceutical and animal remedy industries. ITEMSSpecialty gradesMgSo4.7H2O,≥99.5Fe ,%,≤0.001Cl ,%,≤0.10As ,%,≥0.5Pb ,%,≤1Water insoluble,%,≤0.05 Magnesium Sulphate Heptahydrate MgSO4.7H2O