Abstract: Based on the SBI test of organic thermal insulation materials commonly used in engineering, the burning behaviors of different materials were discussed according to the heat release rate curves. The results show that the fire risk of thermoplastic insulation materials (EPS and XPS) is higher than that of thermoset insulation materials (polyurethane board). There was a great difference between organic insulation materials with different thickness in the burning process, especially XPS. Color steel plate has a certain protective effect on the insulation core material, but will also be weakened by the extension of time and temperature rise. For the boards with a certain thickness, the installation method has an impact on the test results, so it is recommended to confirm installation method according to the sample used in the actual project.

Key words: organic thermal insulation materials, SBI, heat release rate, XPS