New gas—solid composite particles appropriate for extinguishing cooking oil fires will be reported in this article. This powder product is composed of zeolite 13X particles of diameter 1—2 μm and absorbed 2-bromo-3,3,3-trifluoropropene. The preparation and physicochemical properties of the composite particles will be reported. Their performance and possible mechanism in extinguishing cooking oil fires are then investigated with full-scale burning tests. Experiments were carried out in a room of length 3 m, width 3 m, and height 3 m. A cooking oil pool fire of diameter 0.25 m was ignited by ethanol and burnt inside the room. Different dry powder products were also evaluated. Their suppression effect was compared with that of this new product. Results indicated that the new composite particles have better performance in extinguishing cooking oil fires in comparison with other dry powder tested. Relatively shorter extinguishing time was achieved with smaller amount of agents required without any re-ignition. The new composite particles give better performance in suppressing cooking oil fires because of highly efficient free flame radical scavengers, improved cooling capacity, hydrophobic and oleophobic surface. Chemical suppression effects are reported.
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