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A white crystalline powder with a faint phenolic odor. Naphthol is an aromatic compound that is primarily used as an Antioxidant in rubbers. It is stable in air but turns dark with exposure to light. Naphthol is also used as a color developer and as a stabilizer for direct dyes.

See also Naphthol pigment.

Synonyms and Related Terms

beta-naphthol; CI Developer 5; CI 37500; napthol (sp); naftol (Esp.); naphthol (Fr.); 2-naphthol; 2-hydroxynaphthalene; 2-naphthalenol; isonaphthol

Chemical structure



  • Combustible. Flash point = 153C (307F)
  • Skin irritant. Ingestion may cause vomiting, abdominal pain and convulsions.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in ethanol, ether, chloroform, glycerol, oils, alkaline solutions. Insoluble in water.

Composition C10H7OH
CAS 135-19-3
Melting Point 121-123 C
Density 1.22 g/ml
Molecular Weight mol. wt.=144.17
Boiling Point 285-286 C

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • 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
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6471
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • B. Berrie, S.Q. Lomax, 'Azo Pigments: Their History, Synthesis, Properties and Use in Artists' Materials', Studies in the History of Art , National Gallery of Art, Washington DC, No. 57, 1997
  • Website: - density =1.28; m.p.=123-124; b.p.=295