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EVS-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 - Part 7: Assessment of degree of chalking by velvet method (ISO 4628-7:2016)

General information
Valid from 02.03.2016
Base Documents
ISO 4628-7:2016; EN ISO 4628-7:2016
Directives or regulations
None

Standard history

Status
Date
Type
Name
02.03.2016
Main
10.12.2004
Main
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 onsite
evaluation.
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