Abstract: Based on the parameters of flame height, flame temperature and flame shape obtained from the cup-burner experiments, the synergistic extinguishing effect of trans-1,1,1,4,4-hexafluoro-2-butene (HFO-1336-mzz(E),1336 in short) with N2 or HFC-236fa was investigated. The binary of 1336/N2 fire suppression agent showed positive synergism when the volume fraction of 1336 is less than 15%, and the optimum ratio is 5%/95%. All proportion of 1336/HFC-236fa exhibited positive synergistic extinguishing effect, and the optimum proportion is 87%/13%. The addition of HFC-236fa increased the flame height and flame temperature to a certain extent. This is because the fuel-like property of HFC-236fa caused extra heat release in the system.

Key words: fire protection, fluorinated olefin, HFO-1336-mzz(E), synergistic fire extinguishing effect, minimum extinguishing concentration