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  • Many organic solvents can form shock-sensitive, explosive peroxide crystals under normal storage conditions. These peroxide crystals may form on the container plug or the threads of the lid and detonate when the lid is twisted.

    Always remember that:
    • Containers must be dated when received and dated again when opened. EH&S provides stickers if needed.
    • Containers must be disposed of 12 months after receiving or 6 months after opening, whichever happens first.
    • If there are any crystals (especially near the neck or cap threads), liquid separation, or discoloration, contact EHS for hazardous waste removal. Do not move or attempt to open the container.

    The following are classified as peroxide formers:

    Acetaldehyde diethyl acetal Dioxane Tetrafluoroethylene (TFE)
    Butadiene Divinylacetylene (DVA) Tetrahydrofuran (THF)
    Cumene Ethylene glycol dimethyl ether Tetralin (tetrahydronaphthalene)
    Cyclohexene Ethylene glycol ether acetates Vinyl acetate
    Cyclopentene Ethylene glycol monoether Vinyl chloride
    Decalin (decahydronaphthalene) Furan Vinyl ethers
    Diacetylene (butadiene) Methyl isobutyl ketone Vinylacetylene (MVA)
    Dicyclopentadiene Methylacetylene Vinylidene chloride
    Diethyl ether Methylcyclopentane Vinylpyridene
    Diethylene glycol dimethyl ether Potassium amide (sodamide)  
    Diisopropyl ether Styrene