Abstract:With the help of the onset temperature (Te) and maximum peak temperature (Tp) from the non-isothermal DSC curves of tri-base gun propellants M32 and SD at different heating rates (β),the thermal decomposition activation energy (EK and EO) and pre-exponential constant (AK) obtained by Kissinger′s method and Ozawa′s method,the values of specific heat capacity (Cp),density (ρ) and thermal conductivity (λ) obtained by the specifications of standardization method GJB 772A-97-406.1, 401.2 and 409.1, the decomposition heat (Qd,taking half-explosion heat),Zhang-Hu-Xie-Li′s formula, Smith′s equation andWang-Du′s formulas,the values(Te0 and Tp0) of Te and Tp corresponding to β→0,thermal ignition temperature (TTIT),adiabatic time-to-explosion (tTIad),thermal sensitivity probability density function [S(T)] versus temperature (T) relation curves for infinite cylindrical and spheroidic tri-base gun propellants M32 and SD with radius of 0.05m surrounded with surrounding of 373 K,peak temperature corresponding to the maximum value of S(T) versus T relation curve (TS(T)max),safety degree (Sd) and critical thermal explosion ambient temperature (Tacr) of tri-base gun propellants M32 and SD are obtained. The results show that the thermal safety of tri-base gun propellant SD is greater than that of tri-base gun propellant M32,and the accelerating tendency from adiabatic decomposition to explosion of the latter is poorer than that of the former.