... quality, comprtitive price! 4.stable supplier! Synonym: disodium sulfite; disodium salt; exsiccated sodium sulfiteMolecular Formula:Na2SO3Molecular Weight:126.04 CAS No. : 7757-83 ... 0.03% Max0.02% MaxFree alkali(as sodium carbonate)0.4% Max0.1% MaxPacking: Net each in 25kg plastic woven ... making, chemical fiber, film, photographing, food, etc. Anhydrous Sodium Sulphite( Cas No.:7757-83-7)96%,97%,98%