Time to maximum rate under adiabatic condition (TMRad) is a widely-used parameter for evaluation of the probability of decomposition reactions of substances or reactive mixtures under adiabatic conditions. The traditional method for calculation of TMRad necessitates the kinetics and thermodynamics of the decomposition reactions

such as pre-exponential factor

activation energy

reaction order and decomposition enthalpy. To calculate the TMRad using accelerating rate calorimeter (ARC)

a whole thermal curve including both onset decomposition temperature and final temperature is required. However

due to the complexity of reaction mechanism or safe operation of calorimetric experiment

the final temperature is often unavailable

meaning the traditional method is in failure. Therefore

to solve this problem

this paper proposes a new method for calculating TMRad

which is based on the assumption that the consumption of reactants is negligible within a narrow temperature range relative to the whole exothermic curve. Moreover

the experiment results also prove the flexibility of this new method to exothermic curve including final temperature.