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SAN DIEGO STATE UNIVERSITY ENVIRONMENTAL HEALTH & SAFETY DEPT. CLASSES OF PEROXIDIZABLE CHEMICALS A. Chemicals that form explosive levels of peroxides without concentration Butadienea Chloroprenea Divinylacetylene Isopropyl ether Tetrafluoroethylenea Vinylidene chloride B. Chemicals that form explosive levels of peroxides on concentration 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 1-Phenylethanol 2-Hexanol Methylacetylene 3-Methyl-1-butanol Methylcyclopentane Methyl isobutyl ketone 4-Methyl-2-pentanol 2-Penten-1-ol 4-Penten-1-ol 2-Phenylethanol 2-Propanol Tetrahydroforan Tetrahydronaphthalene Vinyl ethers Other secondary alcohols C. Chemicals that may autopolymerize as a result of peroxide accumulation Acrylic acidb Acrylonitrileb Butadienec Chloroprenec Chlorotrifluoroethylene Methyl methacrylateb Styrene Tetrafluoroethylenec Vinyl acetate Vinylacetylene Vinyl chloride Vinylpyridine Vinyladiene chloride D. Chemicals that may form peroxides but cannot clearly be placed in sections A-C Acrolein Allyl etherd Allyl ethyl ether Allyl phenyl ether tert-Butyl methyl ether n-Butyl phenyl ether n-Butyl vinyl ether Chloroacetaldehydediethylacetald p-(n-Amyloxy)benzoyl- 2-Chlorobutadiene chloride n-Amyl ether 1-(2-Chloroethoxy)-2-phenoxyethane Benzyl n-butyl etherd Di(1-propynyl) etherf 4-Methyl-2-pentanone Di(2-propynyl) ether n-Methylphenetole 2-Methyltetrahydrofuran Di-n-propoxymethaned 1,2-Epoxy-3-isopropoxy3-Methoxy-1-butyl acetate propaned 1,2-Epoxy-3-phenoxy2-Methoxyethanol propane Ethoxyacetophenone 3-Methoxyethyl acetate 1-(2-Ethoxyethoxy)ethyl2-Methoxyethyl vinyl ether acetate 2-Ethoxyethyl acetate Methoxy-1,3,5,7-cycloocta(2-Ethoxyethyl)-o-benzoyl- tetraene benzoate ß-Methoxypropionitrile 1-Ethoxynaphthalene m-Nitrophenetole o,p-Ethoxyphenyl isocyanate 1-Octene Chloroethylene Benzyl etherd Chloromethyl methyl ethere Benzyl ethyl etherd Benzyl methyl ether ß-Chlorophenetole Benzyl 1-naphthyl etherd o-Chlorophenetole 1,2-Bis(2-chloroethoxy)- p-Chlorophenetole ethane 1-Ethoxy-2-propyne Bis(2-ethoxyethyl) ether Cyclooctened Bis(2-(methoxyethoxy)- Cyclopropyl methyl ether 3-Ethoxyopropionitrile 2-Ethylacrylaldehyde oxime ethyl) ether Diallyl etherd Bis(2-chloroethyl) ether p-Di-n-butoxybenzene 2-Ethylbutanol ß-ethoxypropionate Bis(2-ethoxyethyl)1,2-Dibenzyloxyethaned Ethyl adipate 2-Ethylhexanal Bis(2-ethoxyethyl)p-Dibenzyloxybenzened phthalate Bis(2-methoxyethyl)1,2-Dichloroethyl ethyl ether Ethyl vinyl ether carbonate Bis(2-methoxyethyl)2,4-Dichlorophenetole Furan ether 2,5-Hexadiyn-1-ol Bis(2-methoxyethyl)Diethoxymethaned phthalate Bis(2-methoxymethyl)- 2,2-Diethoxypropane 4,5-Hexadien-2-yn-1-ol adipate Bis(2-n-butoxyethyl)Diethyl ethoxymethylenemalonate n-Hexyl ether phthalate Oxybis(2-ethyl acetate) Oxybis(2-ethyl benzoate) ß,ß-Oxydipropionitrile 1-Pentene Phenoxyacetyl chloride å-Phenoxypropionyl chloride Phenyl o-propyl ether p-Phenylphenetone n-Propylether n-Propyl isopropyl ether Sodium 8,11,14-eicosa D. Chemicals that may form peroxides but cannot clearly be placed in sections A-C Bis(2-phenoxyethyl)Diethyl fumarated ether Bis(4-chlorobutyl) ether Diethyl acetald Bis(chloromethyl) ethere Diethylketenef 2-Bromomethylm,o,p-Diethoxybenzene ethyl ether ß-Bromophenetole 1,2-Diethoxyethane o,p-Iodophenetole tetraenoate Isoamyl benzyl etherd Isoamyl etherd Isobutyl vinyl ether Sodium ethoxyacetylidef Tetrahydropyran Triethylene glycol diacetate Isophoroned Triethylene glycol dipropionate 1,3,3-Trimethoxypropened 1,1,2,3-Tetrachloro-1,3butadiene p-Isopropoxypropionitriled o-Bromophenetole Dimethoxymethaned p-Bromophenetole 1,1-Dimethoxyethaned Isopropyl 2,4,5-trichlorophenoxyacetate 3-BromopropylDimethylketenef phenyl ether 1,3-Butadiyne 3,3-Dimethoxypropene Limonene 4-Vinyl cyclohexene Buten-3-yne 2,4-Dinitrophenetole 1,5-p-Methadiene Vinylenecarbonate p-(n-amyloxy)benzoate Vinylidene chiorided tert-Butyl ethyl ether 1,3-Dioxepaned Methyl a When stored as a liquid monomer b Although these chemicals form peroxides, no explosions involving these monomers c When stored in liquid form, these chemicals form explosive levels of peroxides without concentration. They may also be stored as a gas in gas cylinders. When stored as a gas, these chemicals may autopolymerize as a result of peroxide accumulation. d These chemicals easily form peroxides and should probably be considered under part B. e OSHA-regulated carcinogen f Extremely reactive and unstable compound. Safe Storage Period for Peroxide Forming Chemicals Description Unopened chemicals from manufacturer Opened containers Chemicals in Part A Chemicals in Parts B and D Unihibited chemicals in Part C Inhibited chemicals in Part C Period 18 months 3 months 12 months 24 hours 12 monthsa a Do not store under inert atmosphere, oxygen required for inhibitor to function. Sources: Kelly, Richard J., Chemical Health & Safety, American Chemical Society, 1996, Sept, 28-36