All the discussions above can be summarized by saying that the main factors controlling material flammability are the thermal stability of the materials, the surface temperature of the materials, the amount of volatiles/fuels formed as a result of thermal degradation, the chemical composition of the volatiles , the combustion energy and finally how FR additives act i.e. if they act in the condensed phase or in the gas phase or in both. This suggests that in order to characterize HFFR systems from the point of view of understanding the underlying flame retardance mechanisms, a suitable analytical toolkit is required that could measure all the above-mentioned parameters quantitatively.