From our analytical studies of Pyrolysis/GC/MS and TGA/TD/GC/MS, we found that the Pyr/GC/MS technique functioned very well for benchmarking PFR s, but it could not be used to determine the fire-retardancy parameters for HFFR formulations compared to TGA/TD/GC/MS technique because it was difficult to obtain reproducible and reliable results with the former technique. This was because the TGA/TD/GC/MS technique could simulate the real fire conditions in a much better and controlled way than the Pyrolysis/GC/MS technique. Contrary to the Pyrolysis/GC/MS technique, we were able to perform our thermal degradation studies in air rather than in an inert atmosphere such as helium, and we were also able to use a larger number of samples for our analyses in the TGA/TD/GC/MS technique.