... 92%,96%,97% competitive price COA and MSDS Sodium sulfite anhydrous 70%~80%,92%,96%,97% 2% ... discount price COA and MSDS Sodium sulfite anhydrous Molecular formula : Na2SO3Appearance : white crystalline powderSepcification ... requirements for packing.Usage1, Paper-making industry2, Leather industry3, Bleaching4, Tannage and food5, Dyeing and painting industry High quality sodium sulfite