KS M ISO 4628-7-2021 色漆和清漆.涂层降解的评定.缺陷数量和大小以及外观均匀变化强度的指定.第7部分:用天鹅绒法评定粉化程度
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