Sodium benzoate

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White granular powder. Sodium benzoate is used as an antiseptic and preservative in paints, food, and medicine. It is also used as a rust and mildew inhibitor.

Synonyms and Related Terms

benzoate of soda; sodium benzoic acid; Antimol

Chemical structure

Sodium benzoate.jpg


  • Combustible.
  • Ingestion of large quantities is toxic.
  • Maximum allowable concentration in food is 0.1%.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water, ethanol. Forms slightly alkaline solution in water.

Composition C6H5COONa
CAS 532-32-1
Molecular Weight mol. wt. = 144.1

Resources and Citations

  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 8725
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p 777
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976