... .NameIndex1Appearancewhite crystal2PH5-73Clarity of solutionclear4Chloride %≤0.0105Iron salt %≤0.00036Heavy metals %≤0.00027Arsenic salt %≤0.00018Purity %≥99.5%3, Uses: there are no toxic ... , printing, dyeing, pigment, ceramic, explosive, match, fireproof material, ma gnesium salt and feed additive magnesium sulphate heptahydrate 99.5% MIN