Fig. 5. Reaction rate constant of thermal decomposition pathway 1 of CF3I.

3.3. Fire extinguishing performance of CF3I

Considering the above physiochemical characteristics and thermal decomposition products, CF3I may be a candidate for clean fire-extinguishing agent. Therefore, the FEC of CF3I, HFO-1336mzz(E) and three HFCs were determined by using the cup-burner method involving methane/propane fuel. And the reliability of our experimental measurement was verified14 by comparing our measured FEC value (9.70vol%) for propane-air flame with that tested by the standard ISO 14520-1-2006 Part 8 (9.7vol%). As listed in Table.2 , CF3I exhibits the lowest FEC (3.61vol%) for extinguishing the propane-air flame, even lower than that of Halon 1301 (3.8vol%-4.3vol%) measured by Fumiaki18. For propane-air flame, the FEC performance of CF3I is much better than three HFCs and HFO-1336mzz(E). For extinguishment of methane-air flame, the FEC of CF3I is also the lowest (3.42vol%), which is comparable to that of Halon 1301 (2.9vol%-4.0vol%). Therefore, the fire-extinguishing performance of CF3I is obviously better than those of HFCs and is comparable to that of Halons.