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
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