... FeSO4. H2O: 91% min. Fe: 30% min ferrous sulphate Types Name of specs.HeptahydrateMonohydrateFeSO4.7H2O, % ≥98-FeSO4.H2O,% ≥-91Fe, % ... size(µm)-95Mesh size12-60-Ferrous sulphate Heptahydrateuses: In industry,it is used to make ferric salt,ink iron oxide red ... for fertilizer, weedicide, pesticide treating wheat smut etc. Ferrous sulphate monohydrate Usage: It is feed additive used as supplement iron ...