... dyeing, bleachin sodium sulfiteMolecular Formula: Na2SO3Molecular Weight: 126.04Purity:96%CAS No.: 7757-83-7Appearance: white crystalline powderPacking: ... , 23T in one 20’fcl container or as customer’s request.Application: medicine, papermaking, tannage, leather, printing, ... a long time. Index NamePremium gradeSodium sulfite ( Na2SO3 ) , % ≥96%Fe , ?≤0.005Water insoluble matter , % ≤0.03Free alkali ( ...