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Hazard Class 5: Oxidizers


Materials that can start and support a fire through the chemical reaction of oxidation. Organic peroxides are separated out because they provide everything necessary for a fire in one chemical.

Subsets of class 5 are:

  • 5.1 Oxidizers means a material that may, generally by yielding oxygen, cause or enhance the combustion of other materials. 
  • 5.2 Organic Peroxide means any organic compound containing oxygen (O) in the bivalent -O-O- structure and which may be considered a derivative of hydrogen peroxide, where one or more of the hydrogen atoms have been replaced by organic radicals, unless any of the following applies:
    • Meets definition of explosive
    • Forbidden for transport per 172.101
    • Does not pose a hazard as a 5.2 material

Shipping Options

  • Become Trained: All shipments of Class 5 material require the shipper to be trained and certified. EHS certifies all shippers at Cornell. All training whether on-site or by an outside vendor, EHS must review training and issue a certificate of training.
  • Contact EHS: EHS has employees trained in the shipping of hazardous material and can ship your material for you (EHS 607-255-8200).