EN ISO 4628-2:2016

European foreword
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Assessment
5 Expression of results
6 Test report
Annex A (normative) - Calibration images
Annex B (informative) - Correlation between ISO 4628-2 and
        ASTM D 714 rating systems
Bibliography

ISO 4628-2:2016 specifies 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.