FAR 121修正案184要求使用防火纺织品，该法规要求座垫必须符合FAR 25.853（c）的规定。 为了满足该规定，将由合成纤维制成的纺织品（例如聚苯并咪唑（PBI），芳香族聚酰胺和玻璃纤维）进行编织或毡合，然后用于包裹泡沫。 所需阻燃纺织品的重量主要取决于泡沫的结构和类型，而低密度泡沫通常需要较重的阻燃层。
C.2.3 Fire-Blocking Textiles；The use of fire-blocking textiles was required by FAR 121, Amendment 184, which required that seat cushions comply with FAR 25.853(c). To meet this regulation, textiles made of synthetic fibers, such as polybenzimidazole (PBI), aromatic polyamides, and glass, are woven or felted and used to encapsulate the foam. The weight of the fireblocking textile required depends primarily on the foam construction and type with lower density foams normally requiring heavier fire-blocking layers.
*阻燃层，防火布的作用是保护内部易燃的海绵，隔绝明火，降低热释放量和速率，增加有效逃生时间。
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