ISO/TR 15658:2009规定了未使用标准化试验设备（如熔炉或试验室）进行的火灾试验的设计、性能和报告程序，这些试验主要基于持续时间或时间。 它适用于所有“自然”火灾试验，旨在评估结构框架、房间（或构成建筑一部分的一套房间）在充分发展的火灾条件下的性能，无论热量输入是否通过自然来源，如婴儿床或燃烧器。它不适用于“火灾反应”大型试验，此类试验主要用于评估材料，且加热速度较慢，最大放热率低于充分开发时的放热率。

ISO/TR 15658:2009 specifies procedures for the design, performance and reporting of fire tests which are not performed using standardized test equipment, such as furnaces or test chambers, and which are primarily duration- or time-based. It is applicable to all ‘natural' fire tests, which set out to evaluate the behaviour of structural frames, rooms (or a suite of rooms forming part of a building), with respect to fully developed fire conditions, regardless of whether or not the heat input is by means of natural sources, e.g. cribs or burners. It is not applicable to ‘reaction-to-fire' large-scale tests, which are primarily designed to evaluate materials and for which the heating rate is slower and the maximum rate of heat release is lower than that which would occur at full development.