NF T30-071

<p>ISO 4628-1:2003 defines a system for designating the quantity and size of defects and the intensity of changes in the appearance of coatings and outlines the general principles of the system used throughout ISO 4628. 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.</p> <p>The other parts of ISO 4628 provide pictorial standards or other means of evaluating particular types of defect. As far as possible, already existing evaluation schemes have been used as the basis.</p> <p>This part of ISO 4628 can also be used for assessing defects not covered by the other parts of ISO 4628.</p>

<p>ISO 4628-2:2003 describes a method for assessing the degree of blistering of coatings by comparison with pictorial standards.</p> <p>NOTE The pictorial standards have been adopted from ASTM D 714, <i>Standard Test Method for Evaluating Degree of Blistering of Paints</i>. The correlation between the ISO and ASTM rating systems is shown in an annex.</p>

<p>ISO 4628-3:2003 describes a method for assessing the degree of rusting of coatings by comparison with pictorial standards.</p> <p>The pictorial standards provided in this part of ISO 4628 show coated steel surfaces which have deteriorated to different degrees by a combination of rust broken through the coating and visible underrust.</p> <p>NOTE 1 The pictorial standards have been selected from the European rust scale published by the European Confederation of Paint, Printing Ink and Artists' Colours Manufacturers' Associations (CEPE)<i>,</i> Brussels<i>. </i>The correlation between the ISO scale and the European rust scale is given in an annex.</p> <p>NOTE 2 The correlation between the ISO scale and the rating system of ASTM D 610, <i>Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces</i>, is also given in an annex.</p>