Product: sodium hydrosulfite 88% Product Standard HG/T2074-2011 Appearance: white crystal powder Specification Tolerance Result Purity(wt%) 88min 88.68 Na2CO3(wt%) 2.5-3.0 2.72 Na2S2O3(wt%) 0.5-1 0.56 Na2S2O5(wt%) 5 - 7 6.68 Na2SO3(wt%) 0.5-1.5 0.63 Fe(ppm) 20ppm max 16ppm Water lnsoluble 0.1 0.04 Total other heavy metals 10ppm max 8ppm
