Ortho-phenyl phenol

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A Fungicide and Bactericide. Ortho-phenyl phenol (OPP) inhibits the growth of fungi and bacteria. It is effective at concentrations as low as 0.05% by weight. OPP is an ingredient in Lysol® and has been used as a fungicides in Starch, Glue, and Polyvinyl acetate emulsions. Dilute solutions have also been used for removing lichens from Granite. OPPNa, the sodium salt of ortho-phenyl phenol, is more soluble.

Synonyms and Related Terms

phenyl phenol; orthophenyl phenol; OPP; 2-phenylphenol; 2-biphenylol; 2-hydroxybiphenyl; Dowicide 1; Dowicide 1 [Dow Chemical]; Topane S [ICI]; Lysol® [Sterling]; Dowicide A (OPPNa) [Dow Chemical]; Topane WS (OPPNa) [ICI]; Mystox WFA (OPPNa) [Catomance]

Chemical structure

Ortho-phenyl phenol.jpg


  • Ingestion is toxic, especially to small mammals (e.g., cats) and aquatic organisms. LD50 = 2480 mg/kg
  • Inhalation and contact may cause irritation and redness.
  • Combustible. Flash point = 124 C (255 F)
  • May discolor textiles, especially silk.
  • ThermoFisher SDS

Physical and Chemical Properties

Insoluble in water. Soluble in alcohols, glycols and sodium hydroxide solution..

Composition C6H5C6H4OH
CAS 90-43-7
Melting Point 58-60 C
Density 1.217 g/ml
Molecular Weight mol. wt. = 170.2
Boiling Point 286 C

Resources and Citations

  • J.Haines, S.Kohler "An Evaluation of Ortho-Phenyl Phenol as a Fungicidal Fumigant for Archives and Libraries" JAIC 25:49-55, 1986
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
  • Marie Svoboda, Conservation Survey Index, unpublished, 1997
  • Conservation Materials Ltd., Catalog
  • A Glossary of Paper Conservation Terms, Margaret Ellis (ed.), Conservation Center of the Institute of Fine Arts, New York City, 1998

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