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A white, hygroscopic flakes used to make Nylon 6. Caprolactam is also used as a plasticizer in paint and a crosslinking agent for Polyurethane.

Chemical structure


Synonyms and Related Terms

aminocaproic lactam; 2-oxohexamethyleneimine; hexahydro-2H-azepin-2-one


  • Toxic by inhalation.
  • Skin contact causes irritation.
  • Combustible. Flash point = 125C
  • Produces toxic fumes including nitrogen oxide and ammonia when burnt.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water, methanol, ethanol, ether, tetrahydrofurfuryl alcohol, dimethylformamide, cyclohexene, petroleum fractions, chlorinated hydrocarbons.

Composition NH(CH2)5CO
CAS 105-60-2
Melting Point 70 C
Density 1.02 g/ml
Molecular Weight mol. wt. = 113.2
Refractive Index 1.4965
Boiling Point 267 C

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 554
  • Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
  • 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 1805
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997

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