The understanding more about the underlying mechanisms behind the fire retarding properties of specific HFFR additives also enable to develop more effective HFFR systems. This toolkit, as shown, also offers the possibility to characterize specific formulations where the flame retardancy could be achieved in several ways. This set of tools has also been proven to be extremely useful in identifying unknown PFR additives in relation to fire performance. The purpose of presenting this work is to illustrate how this toolkit could be used to develop new and effective HFFR systems where complicated HFFR formulations could be developed by understanding the flame retarding mechanisms by combining different PFRs additives and using synergists.