ISO 8502-3:2017描述了一种评估为涂漆准备的清洁钢表面上残留灰尘的方法。它提供了用于评估平均粉尘量的图形评级。它还提供了用于评估灰尘颗粒平均大小的描述性类别。 所述方法是一种定性试验，适用于清洗前的钢表面，对应于ISO 8501？1中定义的a级、B级或C级锈蚀。它可用作“通过/失败”测试，或提供表面灰尘的永久记录。

ISO 8502-3:2017 describes a method for the assessment of dust remaining on cleaned steel surfaces prepared for painting. It provides pictorial ratings for the assessment of the average quantity of dust. It also provides descriptive classes for the assessment of the average size of the dust particles. The method described is a qualitative test useful for a steel surface, before cleaning, corresponding to rust grade A, B or C as defined in ISO 8501？1. It can be used as a "pass/fail" test or to provide a permanent record of the dust present on a surface.