CRITICAL IGNITION TEMPERATURE

While drying in a tray dryer at 60°C, a batch decomposed fairly exothermically but without fire. As a blowing agent, it is designed to have limited thermal stability [1], One of the recently calculated values of 87° and 78°C for induction periods of 7 and 60 days, respectively, for critical ignition temperature coincides with the previous value of 8777 days. Autocatalytic combustion is exhibited. 

See PRESSURE INCREASE in exothermic decomposition See entry critical ignition temperature... 

The recently calculated value of 78°C for critical ignition temperature is appreciably lower than the previous value of 90°C. 

The explosive decomposition of the solid has been studied in detail [6], The effect of moisture upon ignitibility and explosive behaviour under confinement was studied. A moisture content of 3% allowed slow burning only, and at 5% ignition did not occur [7], Thermal instability was studied using a pressure vessel test, ignition delay time, TGA and DSC, and decomposition products were identified [8], The presence of acyl chlorides renders dibenzoyl peroxide impact-sensitive [9], There is a further report of a violent explosion during purification of the peroxide by Soxhlet extraction with hot chloroform [10], Residual traces of the peroxide in a polythene feed pipe exploded when it was cut with a handsaw [11]. The heat of decomposition has been determined as 1.39 kJ/g. The recently calculated value of 69° C for critical ignition temperature coincides with that previously recorded. 

Materials of limited thermal stability may self-heat and eventually ignite through progressive accelerating decomposition if they are stored or processed above the critical ignition temperature (CIT). Knowledge of this is therefore essential for... 

See entries CRITICAL IGNITION TEMPERATURE, PRESSURE INCREASE IN EXOTHERMIC DECOMPOSiTiON(reference 3)... 

See entries critical ignition temperature, deflagration incidents... 

Fig. n.19 Critical friction energy is decreased when the critical ignition temperature is lowered for both or-ganoiron and boron catalysts. 

See entry BLOWING AGENTS, CRITICAL ignition TEMPERATURE (reference 2)... 

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