RDX (1,3,5-Trinitroperhydro-1,3,5-triazine) is a common high-energy dense oxidizer in many energetic materials (EMs), which is a representative example of the caged polynitroamines, such as HMX and CL-20 . RDX has been used for more than 70 years, and there is a long history of scientific research on the material . Thermal decomposition is a fundamental process for any EMs exposed to external stimuli. It relates to the ignition of explosives, the subsequent detonation performance, and their sensitivity from mechanical stimuli to direct heating .