Since our main aim here was only to benchmark a specific PFR for chemical composition with respect to flame retardancy, and we were not interested in fully characterizing PFR s, we put a large effort into finding a simple but quantitative analytical technique that could be used for this benchmarking instead of using sophisticated methods as described above. This benchmarking was essential for us for developing effective HFFR systems where as many as possible fire retarding mechanisms could be combined as discussed above. We used Pyrolysis/GC/MS to analyse a large number of commercially available PFRs and developed fingerprint libraries for these PFRs based on their chromatograms. Unfortunately, we are unable to include any such results in this publication because of our proprietary knowledge. However, it is important for us to share our findings while discussing this toolkit concept.