Class III contains materials that readily form explosive
peroxides without evaporative concentration.
They should be tested for the presence of peroxides at least every three
months after opening and if tested positive should be disposed of
Butadiene
Chloroprene
Divinylacetylene
Isopropyl ether
Tetrafluoroethylene
Vinylidene chloride
Class II contains materials that peroxidize
but become hazardous only on evaporative concentration. They should be tested at least once a year
after opening and disposed of if peroxides are detected.
Acetal
Acetaldehyde
Benzyl alcohol
2-Butanol
Cumene
Cyclohexanol
2-Cyclohexen-1-ol
Cyclohexene
Decahydronaphthalene
Diacetylene
Dicyclopentadiene
Diethyl ether
Diethylene glycol
dimethyl ether
(diglyme)
Dioxanes
Ethylene glycol
dimethyl ether (glyme)
4-Heptanol
2-Hexanol
Methylacetylene
3-Methyl-1-butanol
Methylcyclopentane
Methyl isobutyl ketone
4-Methyl-2-pentanol
2-Pentanol
4-Penten-1-ol
1-Penylethanol
2-Phenylethanol
2-Propanol
Tetrahydrofuran
Tetrahydronaphthalene
Vinyl Ethers
Other secondary
alcohols
Class I contains peroxidizable materials that
also can polymerize exothermically when initiated by the peroxide content. Testing and disposal requirements are the
same as for Class II.
Acrylic acid
Acrylonitrile
Butadiene
Chloroprene
Chlorotrifluoroethylene
Methyl methacrylate
Styrene
Tetrafluoroethylene
Vinyl acetate
Vinylacetylene
Vinyl chloride
Vinylpyridine
Vinyladiene chloride
References:
Improving Safety in the Chemical Laboratory: A Practical Guide, J. Young, 1991.
Safety in the
Chemistry and Biochemistry Laboratory, A.
Picot and P. Grenouillet, 1995.