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A colorless, volatile liquid obtained from the reaction of Acetaldehyde and Ethyl alcohol. Acetal has a pleasing odor and a nutlike aftertaste. It is used as a solvent, and as an ingredient in cosmetics, perfumes (such as jasmine) and flavorings.

Synonyms and Related Terms

diethylacetal; 1,1-diethoxyethane; ethylidenediethyl ether; acetaldehyde diethyl acetal


  • Highly flammable. Flash point = -12C.
  • Sensitive to light, moisture and heat.
  • May form explosive peroxides.
  • Contact causes irritation.
  • Narcotic in high concentrations.
  • Fisher Scientific: SDS

Physical and Chemical Properties

Soluble in hexane, ethanol and ethyl acetate. Slightly soluble in water.

Composition CH3CH(OC2H5)2
CAS 105-57-7
Melting Point -100 C
Density 0.8254 g/ml
Molecular Weight mol. wt. = 118.18
Refractive Index 1.379-1.385
Boiling Point 102.7 C

Resources and Citations

  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993