ISO 4628-7:2016规定了一种方法，尤其适用于评定白色或彩色外部涂层和粗糙表面涂层系统（即ISO 8503-1中所述粗糙度大于参考比较器G第4段的涂层系统）的粉化程度。 规定的试验方法也可用于评估光滑表面上涂层和涂层系统的粉化程度，但ISO 4628？6:2011中规定的方法更适合用于此目的。 本试验方法适用于矿物基底上的涂层和涂层系统，例如纤维水泥、砖、混凝土和渲染，与表面结构无关。经验丰富的操作人员可以非常有效地使用该方法，建议实验室使用，也可在现场使用- 现场评估。 注1:当规范中提及本试验方法时，相关方必须就试验条件（即风化方法和基质）达成一致。 注2:ISO 4628本部分所述的方法是一种相对排序方法，因此不适用于双方之间的协议。然而，见表1的注释。 注3:有关缺陷数量和大小、涂层外观变化强度的命名系统，以及该系统的一般原则，请参考ISO 4628-1。

ISO 4628-7:2016 specifies a method suitable, in particular, for rating the degree of chalking on white or coloured exterior coatings and coating systems on rough surfaces (i.e. those having a roughness greater than segment 4 of the reference comparator G as described in ISO 8503？1). The test method specified can also be used for the assessment of the degree of chalking of coatings and coating systems on smooth surfaces, but the method specified in ISO 4628？6:2011 is preferable for this purpose. The test method is applicable to coatings and coating systems on mineral substrates, e.g. fibre cement, brick, concrete, and renderings, independent of the structure of the surface. The method can be used quite effectively by experienced operators and is recommended for laboratory use as well as for on-site evaluation. NOTE 1 When a reference to this test method is included in specifications, the test conditions (i.e. weathering method and substrate) have to be agreed between the interested parties. NOTE 2 The method described in this part of ISO 4628 is a relative ranking method and is therefore not suitable for use in agreements between parties. See, however, the Note to Table 1. NOTE 3 Refer to ISO 4628？1 for the designation system for quantity and size of defects and the intensity of changes in appearance of coatings, as well as general principles of the system.