Abstract: Based on the flame height, flame temperature and flame morphology data of octafluorocyclobutane with N2, HFC-125 and HFC-227ea mixtures obtained from the combustion cup experiment, the synergistic effects and their proportional relationships were investigated. The results showed that octafluorocyclobutane showed negative synergy with N2 and HFC-125, and positive synergy with HFC-227ea. The best positive synergy was shown when the flow rate of octafluorocyclobutane was set at 13:5 with HFC-227ea, and the extinguishing volume fraaction was 7.02%, which was lower than the minimum extinguishing volume fraction of octafluorocyclobutane and HFC-227ea.

Key words: octafluorocyclobutane, synergistic fire extinguishing effect, composite fire extinguishing media, chemical fire extinguishing