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EN ISO 4628-7:2016

Current
Current

The latest, up-to-date edition.

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)
Published date

02-10-2016

European foreword
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Materials
6 Assessment
7 Test report
Bibliography

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 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.

Committee
CEN/TC 139
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

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ISO 13076:2012 Paints and varnishes Lighting and procedure for visual assessments of coatings
ISO 4628-1:2016 Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 1: General introduction and designation system
ISO 4628-6:2011 Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 6: Assessment of degree of chalking by tape method
ISO 8503-1:2012 Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces

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