These listings were taken from ‘Prudent Practices in the Laboratory, Updated Version, 2011”. They are not considered to be exhaustive.

Class A: Chemicals that form explosive levels of peroxides without concentration

• Isopropyl ether
• Butadiene
• Chlorobutadiene (chloroprene)
• Potassium amide
• Potassium metal
• Sodium amide (sodamide)
• Tetrafluoroethylene
• Divinyl acetylene
• Vinylidene chloride

Class B: These chemicals are a peroxide hazard on concentration (distillation/evaporation).A test for peroxide should be performed if concentration is intended or suspected.

• Acetal
• Cumene
• Cyclohexene
• Cyclooctene
• Cyclopentene
• Diacetylene
• Dicyclopentadiene
• Diehtylene glycol dimethyl ether (diglyme)
• Dietheyl ether
• Dioxane (p-dioxane)
• Ethylene glycol dimethyl ether (glyme)
• Furan
• Methyl acetylene
• Methyl cyclopentane
• Methyl-isobutyl-ketone
• Tetrahydrofuran
• Tetrahydronaphthalene
• Vinyl ethers

Class C: Unsaturated monomers that may autopolymerize as a result of peroxide accumulation if inhibitors have been removed or are depleted

• Acrylic acid
• Butadiene
• Chlorotrifluoroethylene
• Ethyl acrylate
• Styrene
• Vinyl acetate
• Vinyl chloride
• Vinyl pyridine
• Methyl methacrylate