GB/T 30789.7-2015
色漆和清漆 涂层老化的评价 缺陷的数量和大小以及外观均匀变化程度的标识 第7部分:天鹅绒布法评定粉化等级
Paints and varnishes.Evaluation of degradation of coatings.Designation of quantity and size of defects, and of intensity of uniform changes in appearance.Part 7:Assessment of degree of chalking by velvet method
GBT30789.7-2015, GB30789.7-2015