1.1 ISO 5658的这一部分规定了测量垂直扩散的中间尺度试验方法 （向上和向下）火焰在垂直位置定向的产品样品上。衡量 也可以获得横向扩展。它提供了适合比较材料性能的数据， 复合材料或组件，用作墙壁或其他垂直定向产品的暴露表面 在建筑应用中。一些具有异形表面的产品也可以使用改进的程序进行测试 代表产品的最终使用条件。 1.2火焰向上蔓延不限于垂直的表面。人们认识到，一种增强形式的 在与水平面成大于20°角的表面上，也可能发生向上的风辅助火焰蔓延 没有任何外部通风。这种类型的火焰蔓延可以发生在平面倾斜表面和阶梯表面中 楼梯等表面。在这些情况下，火焰蔓延会变得非常迅速，并可能导致严重的问题 在楼梯等逃生通道中。在评估阶梯或倾斜表面材料时，可能会更多 适合使用垂直火焰蔓延试验，而不是试样水平的试验。 1.3 ISO 5658的这一部分适用于材料性质的测量和描述， 产品、复合材料或组件在存在非撞击引燃火焰时对辐射热的响应 在受控的实验室条件下。热源可以被认为代表单个燃烧物品，例如 作为一个废纸箱或一把带软垫的椅子，这种情况通常会被考虑 适用于火灾早期发展阶段（参见ISO/TR 11696-1和ISO/TR 11696-2）。这部分 ISO 5658不应单独用于描述或评估材料、产品， 实际火灾条件下的复合材料或组件。

1.1 This part of ISO 5658 specifies an intermediate-scale method of test for measuring the vertical spread (upward and downward) of flame over a specimen of a product orientated in the vertical position. A measure of lateral spread can also be obtained. It provides data suitable for comparing the performance of materials, composites or assemblies, which are used as the exposed surfaces of walls or other vertically orientated products in construction applications. Some products with profiled surfaces can also be tested with a modified procedure representative of the end-use conditions of the product. 1.2 Upward flame spread is not limited to surfaces which are vertical. It is recognized that an enhanced form of upward, wind-aided flame spread can also occur on surfaces at an angle greater than 20° from the horizontal without any external ventilation. This type of flame spread can occur in both planar sloping surfaces and stepped surfaces such as stairs. Flame spread in these situations can become very rapid and can cause serious problems in escape ways such as staircases. When assessing stepped or sloping surface materials, it may be more appropriate to use a vertical flame spread test rather than a test in which the specimen is horizontal. 1.3 This part of ISO 5658 is applicable to the measurement and description of the properties of materials, products, composites or assemblies in response to radiative heat in the presence of non-impinging pilot flames under controlled laboratory conditions. The heat source may be considered to represent a single burning item such as a wastepaper bin or an upholstered chair within an enclosure, and this scenario would generally be considered to apply during the early developing stage of a fire (see ISO/TR 11696-1 and ISO/TR 11696-2). This part of ISO 5658 should not be used alone to describe or appraise the fire hazard or fire risk of materials, products, composites or assemblies under actual fire conditions.