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  • BSI
    BS EN 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 - Assessment of degree of chalking by velvet method
    Edition: 2016
    $273.55
    / user per year

Description of BS EN ISO 4628-7:2016 2016

This part of ISO 4628 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 8503‑1 ).

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 4628‑6:2011 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 4628‑1 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.



Standard NumberBS EN ISO 4628-7:2016
TitlePaints and varnishes. Evaluation of degradation of coatings. Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Assessment of degree of chalking by velvet method
StatusConfirmed
Publication Date2016-02-29
ReplacesBS EN ISO 4628-7:2003, BS EN ISO 4628-7:2003
Identical National Standard OfISO 4628-7:2016, EN ISO 4628-7:2016
DescriptorsSurface defects, Particulate materials, Paints, Varnishes, Defects, Environmental testing, Defect counting, Deterioration, Field testing, Ageing (materials), Grades (quality), Laboratory testing, Degradation, Coatings, Weathering
ICS87.040 Paints and varnishes
CommitteeSTI/10
ISBN978 0 580 86613 5
PublisherBSI
Pages14



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About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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