ANSI/ISEA 203-2018规定了二次一次性阻燃防护服的最低性能和标签要求。它们通常用于公用工程和炼油厂维护，以及切割或焊接金属的钢铁加工设施。ANSI/ISEA 203-2018所涵盖的服装设计用于可能存在火焰危险的工业环境，此类服装不会对下面穿的主要阻燃防护服提供的热性能产生负面影响。通过将服装分层放置在主要保暖服装上，对符合要求的物品进行独立的阻燃性评估和闪火暴露评估。

ANSI/ISEA 203-2018 establishes minimum performance and labeling requirements for secondary single-use flame resistant protective clothing. These are commonly used in utility work and refinery maintenance and in steel processing facilities where metal is being cut or welded. Apparel covered by ANSI/ISEA 203-2018 is designed for use in industrial settings where flame hazards may exist and such clothing will not negatively impact the thermal performance afforded by the primary flame resistant protective clothing that is worn underneath. Compliant items are independently evaluated for flame resistance and evaluated for flash fire exposure by layering the garment over a primary thermal garment.