ISO 9239-2规定了一种评估水平安装地板系统燃烧性能的方法，该系统在试验室内暴露于热流密度梯度下，用引燃火焰点燃。辐射热梯度高于ISO 9239-1中所述的辐射热梯度，以模拟与包含充分发展的火灾（闪络后）的房间相邻的走廊中的条件。 该方法适用于所有类型的地板，如纺织地毯、软木、木材、橡胶和塑料覆盖物以及涂料。通过该方法获得的结果反映了地板的性能，包括任何基材（如果使用）。 衬垫的修改、与基材的粘合、底层或地板的其他变化可能会影响测试结果。 ISO 9239的本部分适用于在受控实验室条件下测量和描述地板对热量和火焰的响应特性。它不应单独用于描述或评估实际火灾条件下地板的火灾危险或火灾风险。

ISO 9239-2 specifies a method for assessing the burning behaviour of horizontally mounted flooring systems exposed to a heat flux gradient in a test chamber, when ignited with pilot flames. The radiant heat gradient is higher than the one described in ISO 9239-1 in order to simulate conditions in a corridor adjacent to a room containing a fully developed fire (post-flashover). This method is applicable to all types of flooring such as textile carpets, cork, wood, rubber and plastic coverings as well as coatings. Results obtained by this method reflect the performance of the flooring, including any substrate if used. Modifications of the backing, bonding to a substrate, underlay, or other changes of the flooring may affect test results. This part of ISO 9239 is applicable to the measurement and description of the properties of floorings in response to heat and flame under controlled laboratory conditions. It should not be used alone to describe or appraise the fire hazard or fire risk of floorings under actual fire conditions.