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Classes of Chemicals That Can Form Peroxides Upon Aging

Class I

Unsaturated materials, especially those of low molecular weight, may polymerize violently and hazardously due to peroxide initiation.

Acrylic acid
Acrylonitrile
Butadiene
Chlorobutadiene (chloroprene)
Chlorotrifluoroethylene
Methyl methacrylate
Styrene Tetrafluoroethylene
Vinyl acetate
Vinyl acetylene
Vinyl chloride
Vinyl pyridine
Vinylidene chloride

Class II

The following chemicals are a peroxide hazard upon concentration (distillation/ evaporation). A test for peroxide should be performed if concentration is intended or suspected.

Acetal
Cumene
Cyclohexene
Cyclooctene
Cyclopentene
Diacetylene
Dicyclopentadiene
Diethylene glycol dimethyl ether (diglyme)
Diethyl ether (ether)
Vinyl ethers Dioxane (r-dioxane)
Ethylene glycol dimethyl ether (glyme)
Furan
Methyl acetylene
Methyl cyclopentane
Methyl-i-butyl ketone
Tetrahydrofuran
Tetrahydronaphthalene

Class III

Peroxides derived from the following compounds may explode without concentration.

Organic

Divinyl ether
Divinyl acetylene
Isopropyl ether

Inorganic

Vinylidene chloride
Potassium metal
Potassium amide
Sodium amide (sodamide)

NOTE: Lists are illustrative but not exhaustive.
Source: Prudent Practices in the Laboratory