Temperature of No Return: Application of Accelerating Rate Calorimetry Data, Maximum Safe Temperatures and Pack Sizes

THT Technical Information Sheet No. 3 and No. 4 have detailed general interpretation of accelerating rate calorimetry data and specifically the concept of time to maximum rate. Application of accelerating rate calorimetry data to real life scenarios requires a knowledge of the heat loss from the vessel. This is considered qualitatively in THT Technical Information Sheet No. 1.

The basis of stability of a material in a vessel is heat loss capability & heat production
However the heat produced by a reaction will usually increase exponentially with temperature whereas the heat loss from a vessel will increase linearly. Thus there exists the critical point where
heat loss capability = heat production
And of course at higher temperatures the reaction will then go to completion as a runway.


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Reference:
ARC Technical Information Sheet No. 5, Thermal Hazard Technology, UK