Abstract: In order to analyze the importance of mounting and fixing method of specimens for reaction to fire test, and improve the consistency and accuracy of burning behavior and classification evaluation, this article is based on the burning behavior classification evaluation method in GB 8624-2012, Classification for burning behavior of building materials and products, and carry out the SBI test, explores the influence of factors such as test substrate, specimen joints, specimen fixing method, air gap, and specimen fire surface on burning behavior for building materials. The experimental comparison shows that the factors related to the installation of specimens have a significant impact on the test results. Different installation methods of the specimens can lead to significant differences in the test results. Therefore, when conducting reaction to fire test and fire performance classification evaluation, the mounting and fixing method of the specimen should be determined based on the end-use application of the material.

Key words: reaction to fire test, burning behavior classification evaluation, specimen mounting and fixing, SBI test