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[A-2.3 Development of Halon Replacements and Their Evaluation as Fire Extinguishers]

[Contact Person]

Takashi Abe
Chief, Fluorine Chemistry Laboratory
National Industrial Research Institute of Nagoya
Agency of Industrial Science and Technology
1-1, Hirate-cho, Kita-ku, Nagoya 462 Japan
Tel: 81-052-911-2111 (Ext. 330), Fax: 81-52-916-2802
E-mail: abe@nirin.go.jp

[Total Budget for FY1995-FY1997]

73,207,000 Yen (FY1995; 24,156,000 Yen)

[Abstract]

　This program consists of the evaluation of the fire extinguishing ability and the investigation of fire extinguishing mechanism of polyfluoroamines. It was found that polyfluoroamines, which do not contain a bromine atom as the requisite atom for imparting high fire extinguishing ability, showed good fire extinguishing ability. Furthermore, comparative study on the laminar flame speed of methane and heptane flames for several polyfluoroalkylamines showed that perfluoro(N,N-dimethylethylamine) was more effective in fire extinguishing ability than perfluoro(triethylamine), which can not be explained by usual physical fire supression mechanism. For the explanation of this results, special action of CF₃-radical generated from the former compound on the fire suppression mechanism was considered. By studying the computational chemistry in terms of the action of CF₃-radical in fire, new fire-suppresion mechanism by CF₃-radical was found, of which CF₃-radical behaves catalytically as a radical scavenger for hydrogen and hydroxyl radicals in flame just like the role by a bromine radical generated from Halons.

[Key Words]

Halon alternatives, Fire extinguisher, perfluoroamine, laminar flame speed, CF₃ radical, Fire supression mechanism