... Australia, Africa, Middle East, Thailand, Vietnam, Indonesia, factory supply magnesium Sulphate heptahydrate 10034-99-8Formula: MgSO4·7H2OAppearance: ... .0002%maxDry weightless48-52% Use: It is used in feed additive, aquiculture, fertilizer, currying, porcelain, printing, porcelain ... , fireproof materials and feed additives of magnesium salt, etc.Packing: in 25kg ...