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Sodium Metabisulfite HP

Sodium metabisulfite HP is a white crystalline powder used primarily as a preservative and antioxidant in food and beverage processing. It also serves as a reducing agent in various industrial applications. This chemical is soluble in water and has a sulfurous odor.

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CAS: 7681-57-4

Characteristics:

  • Appearance: White to yellowish crystalline powder or granules
  • Odor: Strong sulfur dioxide (SO₂) odor
  • Solubility: Highly soluble in water
  • pH: Acidic (pH 4.0–5.5 for a 1% solution)
  • Density: Approx. 1.48 g/cm³
  • Stability: Decomposes in moist air, releasing sulfur dioxide gas
  • Reactivity: Reacts with strong acids to release toxic sulfur dioxide vapors

Other Names:

  • Disodium Metabisulfite
  • Sodium Pyrosulfite
  • SMBS

Safety Considerations:

  • Skin & Eye Irritation: Can cause irritation or burns; wear gloves, goggles, and protective clothing.
  • Inhalation Risk: Dust or vapors may cause respiratory discomfort; use in a well-ventilated area.
  • Ingestion Hazard: Harmful if swallowed; may cause gastrointestinal irritation.
  • Reactivity Risk: Avoid contact with strong acids and oxidizing agents, as it may release toxic sulfur dioxide gas.
  • Storage: Store in a cool, dry, well-ventilated area, away from moisture and incompatible substances.