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Peroxidizable Chemicals

Peroxidizable chemicals such as those listed below should be dated upon receipt. Storage and use should be limited to the time indicated for each class or list. Containers which show signs of iron oxide or copper oxide should be handled with extra precaution since many metal oxides promote peroxide formation.

The most hazardous compounds - those that form peroxides without being concentrated, which can accumulate a hazardous level of peroxides simply on storage after exposure to air - are in List A. Compounds forming peroxides that are hazardous only when concentrated are in List B. List C consists of vinyl monomers that may form peroxides which can initiate explosive polymerization of the monomers.

Common Compounds that Form Peroxides During Storage

List A
(Three Months)
List B
(Twelve Months)
List C
(Twelve Months)
Peroxide Hazard On Storage Peroxide Hazard On Concentration Hazard Due to Peroxide Initiation Of Polymerization*
Isopropyl Ether Ethyl Ether Styrene
Divinyl Acetylene Tetrahydrofuran Butadiene
Vinylidene Choride Dioxane Tetrafluoroethylene
Potassium Metal Acetal Vinyl Acetylene
Sodium Amide Vinyl Ethers Vinyl Acetate
  2-Butanol Vinyl Chloride
  2-Propanol Vinyl Pyridine
  Cyclohexene Chloroprene
  Methyl Acetylene  
  Dicyclopentadiene *When stored as a liquid, the peroxide- forming potential increases and certain monomers (butadiene, chloroprene, and tetrafluoroethylene) should be considered a List A compound.

Questions regarding peroxidizable chemicals may be addressed to or call 740-593-1666.