Oxygen release vapour phase hazards

The available oxygen content of peroxides is what is required to convert substrate to product. However, the unexpected liberation of this oxygen can present two problems. 

Firstly, it causes a pressure buildup which, if the system is physically confined, may burst vessels or pipework, releasing their contents. Hence, storage and chemical operations involving peroxides should always occur in equipment which is vented or protected from pressure buildup in some way. 

Secondly, the enrichment of the gas phase, above the reaction mixture, with oxygen, alters the explosive limits for volatile organic/air mixtures and could aggravate any fires involving the reactants. Clearly, if large 

In order for the latter hazard to be relevant, fuel must be present in the vapour phase (i.e. volatile combustible material) in addition to oxygen, plus a source of ignition. 

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