| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Generation Characteristics of Toxic and Harmful Gas Products in Combustion of Teflon AFT250 Aviation Wire |
| LIU Tianqi, WANG Ning, CAI Zhixin
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| School of Safety Engineering, Shenyang Aerospace University, Shenyang 110136, China |
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Abstract In order to study the change characteristics of the toxic gases HF, CO and CO2 generated by the combustion of Teflon AFT250 aviation wire, a smoke toxicity test box was used for testing. The results show that under the conditions of ignition temperature of 1 150 ℃ and ignition duration of 10 s, the mass concentration of HF toxic gas generated by the combustion of Teflon AFT250 wire is 8 mg/m3, and the volume concentration of CO and CO2 generated are 0.001 5% and 0.12%, respectively. It shows that a certain amount of poisonous gas has been generated under this condition, but the concentration of poisonous gas is not large. As the length of the intercepted wire increases within 10 to 100 cm, the concentration of the generated toxic and harmful gases HF, CO and CO2 increase continuously. When the wire length is 100 cm, the mass concentration of HF increases to 18 mg/m3, the volume concentration of CO increases to 0.004%, and the volume concentration of CO2 increases to 0.425%. This is mainly due to the increase of the length of the wire will increase the insulating layer material PTFE in the content of F and C elements, more F and C atoms are combined with H and O atoms in the environment. As the ignition duration increases within 10—50 s, the toxic gases HF, CO, and CO2 generated by combustion all increase significantly, the mass concentration of HF gas increases by 7 mg/m3, and the increase by volume concentration of CO and CO2 is 0.001 5% and 0.07%, this is mainly due to the longer the ignition duration, which will cause more C-C and C-F chemical bonds to break, thereby increasing the concentration of HF, CO and CO2, and greatly increasing the risk of human poisoning and suffocation.
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Published: 13 January 2022
Online: 2022-01-13
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| Fund:This work was financially supported by the National Natural Science Foundation of China (12102271,51774168), Natural Science Foundation of Liaoning Province (2020-BS-175), Scientific Research Project of the Education Department of Liaoning Province (JYT19038), and Talent Introduction Doctoral Research Startup Foundation of Shenyang Aerospace University (18YB25). |
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2022, Vol. 36 
