Potassium Metabisulfite

Synonyms: Potassium metabisulphite; Potassium metabisulfite; Potassium pyrosulfite;
Potassium pyrosulphite;
Molecular formula: K2S2O5
Molecular weight: 222.326
CAS No.: 16731-55-8
EINECS No.: 240-795-3

Basic Properties
  • White crystals with strong sulphur dioxide smell, soluble in water
  • In aqueous solution, it is in the form of potassium bisulfite (KHSO3), which exerts a strong reducing effect.
  • Solutions of this nature are rapidly oxidized in air.
Specification (Food Grade)
Items Unit Standard
Assay (as K2S2O5) g/100g ≥97.2
Assay (as SO2) g/100g ≥56.0
Thiosulfate (as K2S2O3) g/100g ≤0.1
Sodium (as Na) g/100g ≤2
Chloride (as Cl) g/kg 0.5
pH (10%) --- 3.8～4.8
Heavy metal (as Pb) Mg/kg 10
As, Cu, Pb, Se, Zn each Mg/kg ≤1
Fe Mg/kg ≤5
Hg Mg/kg ≤0.1
K2SO3+K2SO4 Mg/kg balance
Applications
  • Mainly used in foodstuffs industry as a preservative
  • For the treatment of wine after fermentation has ended
  • For the removal of moulds from freshly selected grapes before pressing
  • Used in pharmaceutical materials, photochem, bleaching, etc.
Packing and Shelf Life

kraft paper bags / LDPE bags of 25 kg or as per requirement
shelf life: one year

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