... quality . used in feed, preserves, waste water treatmentand water purity, disinfection, rubber, leather,washingpowder, livestock feed, pencils.Storage ... time .used in feed, preserves, waste water treatmentand water purity, disinfection, rubber, leather,washingpowder, livestock feed, pencils. ... Detailed specification:FesO4.7H2O: 98%MINIRON 19.68%MINPB 0.002%MAXAS 0.0003% ...