... 80ppm,150ppm purity:52%,iron:20ppm,50ppm,150ppmApplication:Used as making sulphur dyestuff intermediate reducer, mordant, flotation agent, depilatory ... for leather, digestion auxiliary in paper-making also widely used in pigment and rubber industry, etc. Packing ... be packed, inner side: woven bag, middle: transparent film bag, outside: woven bag, one 20FCL can load 20MT