Abstract: Four kinds of car seat materials including PU synthetic leather, flannelette, mesh cloth and genuine leather were tested for horizontal and vertical combustion. The microstructure was observed by SEM. The toxic gas content and particle concentration of  PU synthetic leather, flannelette and mesh cloth were measured. The results showed that the horizontal combustion test results of  PU synthetic leather and flannels did not meet the requirements of national standards, while mesh cloth and dermis met the requirements of national standards.The flame retardant performance of PU synthetic leather and flannelette in vertical combustion test is greatly reduced, The mesh fabric can be ignited in the vertical direction, while the genuine leather has good flame retardant performance in the vertical direction.Toxic gas harm caused by combustion, PU synthetic leather > flannelette > mesh cloth; Harmful particles, mesh cloth > flannelette > PU synthetic leather.The flame retardant properties of materials are closely related to the chemical properties and microstructure of materials.

Key words: seat material, combustion characteristics, flame resistance