PAINTS AND VARNISHES - EVALUATION OF DEGRADATION OF COATINGS - DESIGNATION OF QUANTITY AND SIZE OF DEFECTS, AND OF INTENSITY OF UNIFORM CHANGES IN APPEARANCE - PART H2: ASSESSMENT OF DEGREE OF BLISTERING (FIRST REVISION) (ISO 4628-2:2003, IDT)
This part of ISO 4628 describes a method for assessing the degree of blistering of coatings by comparison
with pictorial standards.
The pictorial standards provided in this part of ISO 4628 illustrate blisters in the sizes 2, 3, 4 and 5, and each
size in the quantities (densities) 2, 3, 4 and 5.
ISO 4628-1 defines the system used for designating the quantity and size of defects and the intensity of
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.
