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