Three Months Peroxide Hazard Generated During Storage

Divinyl acetylene Sodium amide
Isopropyl ether Vinyliden chloride
Potassium metal

Twelve Months Peroxide Hazard

Acetal Methylcyclopentane
Cumene Methyl acetylene (Propyne)
Cyclohexene Methyl isobutyl ketone
Diacetylene Tetrahydrofuran
Dicyclopentadiene Tetrahydornapthalene (Tetralin)
Dioxane Vinyl ethers
Ethyl ether
Ethylene glycol
             dimethyl ether (glyme)

Twelve Months Hazard Due to Peroxide Formation or Initiation of Spontaneous Polymerization *

Acrylic acid Tetrafluoroethylene
Acrylonitrile Vinyl acetate
Butadiene Vinyl acetylene
Chloroprene Vinyl chloride
Chlorotrifluoroethylene Vinyl pyridine

Other Time-Sensitive Chemicals

Chloroform (on contact with air) Sodium azide (on contact with metals)
Picric acid (when dry) Picrylsulfonic acid (when dry)
Picryl Chloride (when dry)  


When stored as a liquid, the peroxide forming potential of the Group 3 chemicals increases and certain of these monomers should then be considered as Group 1 compounds. (especially butadiene, chloroprene, and tetrafluoroethylene)


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