由于市場的多元化，產品的防火性能是人們比較關注的方面。橡膠作為軌道機車常用的彈性材料需要通過ASTM C1166火焰蔓延測試，根據火焰蔓延FP指數來評估。

　　ASTM C1166: Standard test method for flame propagation of dense and cellular elastomeric gaskets and accessories.

    ASTM C1166:密致及多孔彈性體襯墊和附件火焰蔓延的試驗方法。

　　橡膠產品ASTM C1166測試方法Calculate the average flame propagation (FP) for R1through R6 according to the following equation:FP= ([R1o-R1 f]+ [R2o-R2f] +[R3o-R3f]+ [R4o-R4f] +[R5o-R5f] +[R6o-R6f]) / 6Where:R1o=original R1R1 f= final R1R2o=original R2R2 f= final R2

　　NFPA130測試數據要求此測試方法被引用于NFPA130彈性體襯墊和附件的防火性能測試部分。Average flame propagation shall be less than 101.6mm (4 in), and no specimen shall be completely consumed. 平均火焰傳播距離不超過101.6mm(4英寸)，且無片樣品全部燃燒完，即P≤4 inches。