... and FDA No. 1.Ferrous Sulphate Monohydrate 6-12 Mesh2.Fe>30%,Pb<20ppm,As<2ppm,Cd<5ppm3 ... Category 1: big granular, granular size: 6-12meshl Category 2: middle granular, granular size: 12-24meshl Category 3: little granular, ... granular size: 24-40meshl Category 4: powder, powder size: 180umSpecification:ItemSpecificationFeSO4. H2O91 ...