DIN EN ISO 4628-7 E:2014-08 色漆和清漆 漆膜降解的评定 缺陷量值、大小以及外观均匀改变程度的规定 第7部分:粉化等级评定用丝绒方法(草案)
Provisions for the assessment of the magnitude, size and degree of uniform change in appearance of paint and varnish film degradation - Part 7: Velvet method for the assessment of chalking grades (draft)