Name: sodium sulfite CAS NO :7757-83-7 Grade: industrial grade, food grade Molecular formula : Na2SO3 Molecular weight: 126.04 Appearance : white crystalline powder Quality standard: HG/T 29672000 Packing: Net Weight 25kg or 50kg/plastic woven sack with PE inner-bag, 20MT/20fªFCL Sepcification: Index name Premium grade Super grade First grade Salable product Industrial grade Sodium sulfite ( Na2SO3 ) , % fª 97.0 96.0 93.0 90.0 Fe , f_ 0.003 0.005 0.01 / Water insoluble matter , % f_ 0.02 0.03 0.05 / Free alkali ( as Na2SO3 ) , % f_ 0.10 0.40 0.60 / Na2SO4 , % f_ 2.50 / / / NaCl , % f_ 0.10 / / / . Packing: double-layer plastic woven bag. Uses: bleaching agent for paper pulps; waste water treatment; reducing and sulphonating agent for chemical synthesis; bleaching agent for textiles; color striper and deoxidization; floating agent for mining; auxiliary chemical in tanning process. Packing: Net Weight 25kg or 50kg/plastic woven sack with PE inner-bag, 20MT/20fªFCL.