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1. Liquids
<br />2. Pastes
<br />3. Solids usually finely divided powders}
<br />Classification of organic peroxides according to hazard:
<br />UNCLASSIFIED - Peroxides which are capable of detonation. These
<br />peroxides present an extremely high explosion hazard through rapid
<br />explosive decomposition and are regulated in accordance with the pro-
<br />v~sians of Article l7 for DOT Class A explosives.
<br />CLASS I - Class I peroxides are capable of deflagration, but not
<br />detonation. These peroxides present a high explosion hazard through
<br />rapid decomposition. Examples: fi0-fi5% acetyl cyclohexane, sulfonyl
<br />peroxide, benzoyl peroxide over 98% concentration, 901 t-butyl
<br />hydroperoxide, 15% t-butyl peroxyacetate, 9~% t-butyl peroxyisapro-
<br />pylcarbonate, 100% diisopropyl peroxydicarbonate, 98% di-n-propyl
<br />peroxydicarbonate, 85% di-n-propyl peroxydicarbonate.
<br />CLASS II - Class II peroxides burn very rapidly and present a
<br />severe reactivity hazard. Examples: 25% acetyl peroxide, 10°la t-butyl
<br />hydroperoxide, 981 t-butyl peroxybenzoate, 91% t-butyl peroxy-~-
<br />ethylhexanoate, 75%a t-butyl peroxyisobutyrate, 15% t-butyl peroxyiso-
<br />propylcarbonate, 75% t-butyl peroxypivalate, 85% dibenzoyl peroxydi-
<br />carbonate, 981 di-sec-butyl peroxydicarbonate, 15% di-sec-butyl
<br />peroxydicarbonate, 95% 1,I-di-~t-butylperoxy}-3,5,5-trimethyecyclo-
<br />hexane, 91%a di-~~-ethylhexyl} peroxydicarbonate, 9~% 2-5 dimethyl-2,5
<br />~di~benzoylperoxy}} hexane, 43% peroxyacetic acid.
<br />CLASS III - Class III peroxides burn rapidly and present a moderate
<br />reactivity hazard. Examples: ~9°lo acetyl cyclohexane sulfonal perivxide,
<br />18% benzoyl peroxide, 55% benzoyl peroxide paste, 8fi% cumene hydro-
<br />peroxide, 98% di-~4-butylcyclohexyl} peroxydicarbonate, 75% t-butyl
<br />peroxyneodecanoate, 98.5/ decanoyl peroxide, 99% di-t-butyl peroxide,
<br />75°la 1,1-diet-butylperoxy}3,5,5-trimethylcyclohexane, 50°l0 2,4, dichloro-
<br />benzoyl peroxide, 30% diisopropyl peroxydicarbonate, 90°l0 2,5-dimethyl-
<br />~,5-di~~-ethylhexanalperoxy} hexane, 901 2,5-dimethyl-~,5-di~ti-butyl-
<br />peroxyl} hexane, methyl ethyl ketone peroxide ~9% active oxygen}.
<br />CLASS IV - Class IV peroxides burn in the same manner as ordinary
<br />combustibles and present minimal reactivity hazard. Examples: 70%
<br />benzoyl peroxide, 50% benzoyl peroxide paste, 40% benzoyl peroxide
<br />slurry, 35°le benzoyl peroxide powder, 10% t-butyl hydroperoxide, 501
<br />t-butyl peroxy-2-ethylhexanoate, 981 decumyl peroxide, 401 di-~2-
<br />ethylhexal} peroxydicarbonate, 98% laurel peroxide, 5~.5% p-methane
<br />hydroperoxide, methyl ethyl ketone peroxide X5.5% active oxygen}.
<br />CLASS V - Class V peroxides do not burn or present a decomposition
<br />hazard. Examples: 35°/a benzoyl peroxide, 40% 1,1-di-t-butyl peroxy
<br />3,5,5-trimethylcyclahexane, 41% ~,5-di ~t-butyl peroxy} hexane, Z,4-
<br />pentanedione peroxide ~4% active oxygen}.
<br />NOTE: Examples are based upon NFPA Standard 43B.
<br />P ro horic Materials.
<br />Ordinance - 88
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