A Preface
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The committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

ISO 4628-6-2016 – Assessment of ageing of lacquers and varnish coatings – Assessment of the number and size of defects and the strength of uniform changes in appearance – Part 6: Determination of powder grade by tape method

The third edition eliminates and replaces the second edition (ISO 4628-4:2003), which has been technically revised with the following changes:

a) The lower limit of defects in visual assessment has been introduced in Table 2;

b) Added normative reference to ISO 13076 for assessing lighting.

ISO 4628 consists of the following sections under the general heading Paints and varnishments – Assessment of coating degradation – designation of the number and size of defects, and the intensity of uniform changes in appearance:

— Part 1: General introduction and specifying the system

— Part 2: Assessment of the degree of foaming

— Part 3: Assessment of the degree of rust

Part 4: Evaluation of the degree of cracking

— Part 5: Assessment of the degree of peeling

— Part 6: Assessing the degree of chalking by the tape method

— Part 7: Assessing the degree of chalking by the velvet method

— Part 8: Assessing the degree of delamination and corrosion around marking or other artificial defects

— Part 10: Assessment of the degree of filamentous corrosion

ISO 4628-6-2016 – Assessment of ageing of lacquers and varnish coatings – Assessment of the number and size of defects and the strength of uniform changes in appearance – Part 6: Determination of powder grade by tape method

1 Scope
This part of ISO 4628 specifies a method for assessing the degree of coating cracking by comparison with a graphical standard.

ISO 4628-1 defines the system used to specify the number and size of defects and the intensity of changes in the appearance of a coating and Outlines the general principles of this system. The system is particularly suitable for defects caused by aging and weathering, as well as uniform changes, such as color changes, such as yellowing.

2 Normative references
The following documents are referred to normatively in whole or in part in this document and are required for their application. For dated references, only the cited version applies. For undated references, the new version of the reference (including any revisions) applies

ISO 13076, Paints and varnishes – Lighting and procedures for visual assessment of coatings

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1 Degree of cracking

Rating characterizing coating cracks in terms of number, size, and depth

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