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ISO 4628-7:2016

Paints and varnishes -- Evaluation of degradation of coatings -- Designation of quantity and size of defects, and of intensity of uniform changes in appearance -- Part 7: Assessment of degree of chalking by velvet method

SKU: iso_066403_158397 Published by ISO Publication Year 2016 2 Edition 5 pages

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ISO 4628-7:2016 specifies a method suitable, in particular, for rating the degree of chalking on white or coloured exterior coatings and coating systems on rough surfaces (i.e. those having a roughness greater than segment 4 of the reference comparator G as described in ISO 8503â€‘1). The test method specified can also be used for the assessment of the degree of chalking of coatings and coating systems on smooth surfaces, but the method specified in ISO 4628â€‘6:2011 is preferable for this purpose. The test method is applicable to coatings and coating systems on mineral substrates, e.g. fibre cement, brick, concrete, and renderings, independent of the structure of the surface. The method can be used quite effectively by experienced operators and is recommended for laboratory use as well as for on-site evaluation. NOTE 1 When a reference to this test method is included in specifications, the test conditions (i.e. weathering method and substrate) have to be agreed between the interested parties. NOTE 2 The method described in this part of ISO 4628 is a relative ranking method and is therefore not suitable for use in agreements between parties. See, however, the Note to Table 1. NOTE 3 Refer to ISO 4628â€‘1 for the designation system for quantity and size of defects and the intensity of changes in appearance of coatings, as well as general principles of the system.

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GST REG No R119441681
QST REG No R1006017360

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ISO 4628-7:2016

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