Abstract: In this paper, the pyrolysis characteristics of polyurethane foams with different densities and their influence on gasoline identification were analyzed by simultaneous thermal analysis（STA）and gas chromatography-mass spectrometry（GC-MS）.Experiments result indicated that there are two main weight loss processes during the thermal decomposition of polyurethane foams. In the first stage, the initial pyrolysis temperature of 80 kg/m3 polyurethane foam is slightly lower and the mass loss rate is slightly larger. The target characteristic components of aromatic hydrocarbons, polycyclic aromatic hydrocarbons and Indane gasoline can be detected in the combustion residue of polyurethane foam, but the number of characteristic components detected in the combustion residue of 40 kg/m3 polyurethane foam is obviously higher, so the 40 kg/m3 The research results provide some data support for the identification of flammable liquids.density polyurethane foam has stronger interference than 80 kg/m3 in gasoline identification.

Key words: gas chromatography-mass spectrometer, synchronous thermal analyzer, polyurethane foam, gasoline, pyrolysis, identification of flammable liquids