This paper presents the development of a test system to evaluate the ignition susceptibility of several common plastics in nitrogen trifluoride (NF3) as compared to gaseous oxygen. A test system was developed to allow for measurement of the autogenous ignition temperature (AIT) in both gaseous oxygen and NF3. The autogenous ignition temperatures of Kel-F(R) 81 PCTFE, Neoflon(R) PCTFE5, Teflon(R) PTFE, Nylon 101, PVDF, and PVC were determined in gaseous NF3 and in gaseous oxygen.