Textile wash agent Ferrous Sulfate 99% 1.Direct manufacturer,cheap price 2.Fe:20%min ... 3.FeSO4.7H2O:98%min Textile wash agent Ferrous Sulfate 99% Ferrous Sulphate Heptahydrate 1.Direct manufacturer,cheap price 2. ... oxide.Technical Index: ItemNational IndexEnterprise index (FeSO4 · H2O), % , ≥ 98 99 Fe,%, ≥ 19.7 20 Insoluble matter,%,≤ 0.5 0.0015 ... ≤ 0.0005 0.0001 Textile wash agent Ferrous Sulfate 99%