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Sodium Sulphite
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/20"FCL
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.
Index name Premium grade
Super grade First grade Salable product Industrial grade
sodium sulfite ( Na2SO3 ), % ≥ 97.0 96.0 93.0 90.0
Fe, ≤ 0.003 0.005 0.01 /
Water insoluble matter, % ≤ 0.02 0.03 0.05 /
Free alkali ( as Na2SO3 ), % ≤ 0.10 0.40 0.60 /
Na2SO4, % ≤ 2.50 / / /
NaCl, % ≤ 0.10 / / /