... :MgSO4 7H2O, Molecular weight:246.48, white or colorless crystal, 2, Technical indexNo.NameIndex1Appearancewhite crystal2PH5-73Clarity of solutionclear4Chloride %≤0.0105Iron salt ... %≤0.00036Heavy metals %≤0.00027Arsenic salt %≤0.00018Purity %≥99.5%3, Uses: there are no toxic matter, thus it ... material, ma gnesium salt and feed additive magnesium sulphate heptahydrate 99.5% MIN