Paints and varnishes—Evaluation of degradation of coatings—Designation of quantity and size of defects,and of intensity of uniform changes in appearance—Part 4:Assessment of degree of cracking
IDT ISO 4628-4:2003
全国涂料和颜料标准化技术委员会(SAC/TC 5)
GB/T 30789的本部分给出了通过与标准的图示比较，使用GB/T 30789.1中规定的定义，来评定开裂等级的方法。
ISO 4628-1定义了关于涂层老化引起的缺陷的数量和大小以及外观均匀变化程度评定体系，并概述了评定体系的通则。该体系特别适用于人工加速老化和天然曝晒引起的缺陷和均匀变化，如颜色变化,例如：黄变。
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