Benzoyl peroxide

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A white, crystalline solid. Benzoyl peroxide is an organic peroxide that is primarily used as a Catalyst for polymerization reactions, such as the curing of Bio-Plastic® polyester resin. Benzoyl peroxide is also used to bleach Flour, fats, oils, and waxes.

Synonyms and Related Terms

benzoperoxide; dibenzoyl peroxide; benzoyl superoxide; Acetoxyl; Acnegel; Benoxyl; Oxy-5; Panoxyl; Persa-gel; Theraderm



Chemical structure

Benzoyl peroxide.jpg


Flammable and explosive above 105C. Highly toxic by inhalation. Slightly toxic by skin contact and toxic by eye contact.

ThermoFisher: SDS

Physical and Chemical Properties

Soluble in most organic solvents. Slightly soluble in ethanol, oils and water.

Composition (C6H5CO)2O2
CAS 94-36-0
Melting Point 103-105 C
Density 1.3340 g/ml
Molecular Weight mol. wt. = 242.2

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1159
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • Website:

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