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An acronym for a widely used insect repellent composed of n,n-diethyl-m-toluamide. Deet is a colorless, oily liquid with a mild characteristic odor. It is not an Insecticide.

Synonyms and Related Terms

diethytoluamide, n,n-diethyl-m-toluamide; n,n-diethyl-3-methylbenzamide; Repel; DEET [Morflex]; m-DETA; ENT-20218; Autan, Detamide; Dieltamid; Flypel; Off; metadelphene


  • Combustible. Flash point = 155C.
  • Eye irritant.
  • Toxic by ingestion and inhalation of large doses and repetitive small doses.
  • Overexposure may cause hypertension, confusion, tremors, seizures, coma.
  • EPA: Safety sheet

Physical and Chemical Properties

Soluble in ethanol, ether, and benzene.

Insoluble in water.

Composition C12H17NO
CAS 134-62-3
Density 0.996 g/ml
Molecular Weight mol. wt. = 191.27
Refractive Index 1.5206
Boiling Point 160 C

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2912
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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