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Hazard Predictions

• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Unstable when heated: Reaction products may be unstable above ambient temperatures
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive
• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization

The hazards associated with peroxidation of butadiene are closely related to the fact that the polyperoxide is insoluble in butadiene and progressively separates. If local concentrations build up, self-heating from the (initially slow) spontaneous decomposition begins, and when a large enough mass of peroxide accumulates, explosion occurs. Critical mass at 27掳C is a 9 cm sphere; the size decreases rapidly with increasing temperature (Hendry, D. G. et al., Ind. Eng. Chem., Prod. Res. Dev., 1968, 7, 36, 1145).

Although isoprene and styrene also readily peroxidize, the peroxides are soluble in the monomers, and the degree of hazard is correspondingly less (Mayo, F. R. et al., Prog. Rept. No. 40, Sept. 1971, Stamford Res. Inst. Project PRC-6217).

Potential Gas Byproducts

• Oxygen (O2)