PAINTS AND VARNISHES - EVALUATION OF
DEGRADATION OF COATINGS - DESIGNATION
OF QUANTITY AND SIZE OF DEFECTS, AND OF
INTENSITY OF UNIFORM CHANGES IN
APPEARANCE - PART H10: ASSESSMENT OF
DEGREE OF FILIFORM CORROSION
(ISO 4628-10:2003, IDT)
This part of ISO 4628 describes 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 the filaments.
Pictorial examples provided in Annex A of this part of ISO 4628 illustrate different ratings for the length of the
longest filament L and the most frequent length M of the filaments. A comparison of the test panels with the
12 pictures in Annex A does not supersede the obligatory numerical assessment (method 1 or 2).
