Sodium Hydrosulfite

Sodium Hydrosulfite (Na2S2O4) is a whitish to yellowish crystalline solid with a sulfur dioxide-like odor. This chemical spontaneously heats on contact with air and moisture. Characterisitics include: pyrophoric, water-reactive, strong reducing agent. Because it is flammable, we recommend a safe chemical storage building that meets specific regulations for storing Sodium Hydrosulfite. Please review our fire rated products: Flammable storage, FIRELoc, SUPERLoc

Sodium Hydrosulfite Storing Details

  • Flammable Details: Pyrophoric
  • Storage Details: Keep separated from incompatible substances, such as oxidizers. Store and handle in accordance with all current regulations and standards. Store in compliant, approved flammables storage buildings, separated from oxidizers and sources of ignition.
  • Compatible Details:
  • Description: Sodium dithionite is a white crystalline powder with a weak sulfurous odor. It is a sodium salt of dithionous acid. Although it is stable under most conditions, it will decompose in hot water and in acid solutions.
  • Classification: CLASS 4.2
  • Brand Name: n/a

Sodium Hydrosulfite Properties

Formula Density Boiling Point; IUPAC ID Molar Mass Soluble In Melting Point
Na2S2O4 2.19 g/cm³ Decomposes n/a 174.107 g/mol Water 52°C, 325 K, 126°F




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