... iron sulfate heptahydrate 1)FeSO4.7H2O%,98%;Fe,20% 2)package,25kg/bag 3)Usage, additives,fertilizer,water scavenging agent iron ... wet air it will be oxidated to basic ferric sulphate.Soluble in water and glycerol, insoluble in alcohols ... .002-0.0002Fineness (through 180umtest sieve) %≥ 9595-- Iron Sulphate Heptahydrate water scavenging agent