油漆和清漆

[中文适用范围]： 本文件规定了一种通过测量最长丝的长度 L 和最常见的丝的长度 M 来评估从划痕处产生的丝状腐蚀量的方法。本文件附件 A 中提供的图片示例说明了丝状腐蚀程度的不同评级。将测试面板与附件 A 中的 12 张图片进行比较并不取代强制性的数值评估（方法 1 或 2）。涂层外观的均匀变化并概述了系统的一般原理。该系统旨在用于由老化和风化引起的缺陷，以及颜色变化等均匀变化，例如变黄。 [外文原描述]： This document specifies a method for assessing the amount of filiform corrosion developed from a scribed mark by measuring the length of the longest filament L and the most frequent length M of filaments. Pictorial examples provided in Annex A of this document illustrate different ratings for the degree of filiform corrosion. A comparison of the test panels with the 12 pictures in Annex A does not supersede the obligatory numerical assessment (method 1 or 2). ISO 4628 - 1 defines a system used for designating the quantity and size of defects and the intensity of uniform changes in appearance of coatings and outlines the general principles of the system. This system is intended to be used, in particular, for defects caused by ageing and weathering, and for uniform changes such as colour changes, for example yellowing.