Abstract: Made a experimental study of combustion characteristics of flexible polyurethane foam (FPUF) as a common upholstered furniture filler and variation characteristics of asphyxiating gas components in combustion flue gas. Also the effective dose fraction FED model was used to evaluate the smoke toxicity. The results show that the development law of FPUF heat release rate (HRR) curves under the action of droplet deposition with different salt humidity is basically similar in both forced ignition mode and non- forced ignition mode.The ignition time of FPUF lengthens with the increase of fog droplet salinity in the non-forced ignition mode, but it is similar in the forced ignition mode. The variation rules of each flue gas component produced by FPUF combustion in air with different salt humidity are similar. When the equivalence ratio is 0.9 ~ 1.6, the high salt humidity air has a great influence on the formation of each flue gas component. Moreover, the presence of NaCl in the air with high salt humidity will promote the formation of asphyxiating gas components; the increase of salinity in the air with high salt humidity can enhance the toxicity of flue gas produced by FPUF combustion.

Key words: marine environment, flexible polyurethane foam, combustion characteristics, asphyxiating gas