... in South America, Australia, Africa, Middle East, Thailand, Vietnam, Indonesia, factory supply magnesium Sulphate heptahydrate 10034-99-8Formula: MgSO4·7H2OAppearance: white ... ) 0.0002%maxDry weightless48-52% Use: It is used in feed additive, aquiculture, fertilizer, currying, porcelain, printing, porcelain, fireproof materials and ...