LAUSR

trans-1-Chloro-3,3,3-trifluoropropene (trans-CF3CHCHCl) and 2-chloro-3,3,3-trifluoropropene (CF3CClCH2) have the potential to act as fire extinguishing agents, but their thermal decomposition mechanism and fire extinguishing performance have not been investigated. In this paper, thermal decomposition experiments and theoretical calculations were carried out to verify the possible thermal decomposition process and fire extinguishing performance of these potential fire extinguishing agents. trans-CF3CHCHCl and CF3CClCH2 can be decomposed into radicals, such as HCl, ˙CF3, and ˙CF2, which can consume ˙OH and ˙H radicals for fire suppression. Furthermore, the experimental and calculation results demonstrated that CF3CClCH2 shows better thermal stability. To characterize the inhibitory efficiency of trans-CF3CHCHCl and CF3CClCH2, the minimum extinguishing concentrations were measured to be 6.8% and 6.9%, respectively. As a result, trans-CF3CHCHCl and CF3CClCH2 performed well, and their application as Halon substitutes is worth exploring.