Sodium hydrosulfite 85%88%90% 1.CAS No.: 7775-14-6 2.MF: ... Crystal Powder 4.50kgs in iron drums Sodium hydrosulfite 85%88%90%1) We are second biggest manufacturer in China ... Producing Method: Sodium Formate Process3)Specifications:ItemsIndexTech GradeFood GradeNa2S2O4, % ≥85%88%90%85%Fe, ppm ≤202020---Zn, ppm ≤1111As, ppm ≤--------- ... and canned mushrooms.Packing and Loading Sodium Hydrosulfite 85%88%90%