... 70%~80%,92%,96%,97% 2% discount price COA and MSDS Sodium sulfite anhydrous Molecular formula : Na2SO3Appearance : white crystalline powderSepcification: Index name ... Premium grade Super grade First grade Salable product Industrial grade Sodium sulfite ( Na2SO3 ) , % ≥97.0 96.0 93.0 90.0 ... in medicine, papermaking, tannage, leather, printing, dyeing, bleaching and food . Sodium sulfite anhydrous