NF EN ISO 4628-10, T30-140-10 (03/2024)

This document specifies a method for assessing the amount of filiform corrosion that develops from a scratch, by measuring the longest filament length L and the most common filament length M. The sample plates of Annex A of this document illustrate different ratings of the degree of filiform corrosion. A comparison of the test panels with the 12 images in Appendix A does not replace the mandatory digital evaluation (method 1 or 2). ISO 4628-1 defines a system used to designate the quantity and dimensions of defects and the intensity of uniform changes in appearance of coatings, and sets out the basic principles of the system. This system is intended to be used especially for defects due to aging and weathering, as well as uniform changes such as color changes, such as yellowing.
(Automatic translation from French)