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

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

02-29-2016

Publisher

British Standards Institution

This part of ISO4628 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 ISO8503‑1 ). 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 ISO4628‑6:2011 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. NOTE1 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. NOTE2 The method described in this part of ISO4628 is a relative ranking method and is therefore not suitable for use in agreements between parties. See, however, the Note to Table1. NOTE3 Refer to ISO4628‑1 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	STI/10
DevelopmentNote	Supersedes 97/120367 DC (10/2003) Supersedes BS 3900-H7(2003) & 14/30301174 DC. (02/2016)
DocumentType	Standard
Pages	14
PublisherName	British Standards Institution
Status	Current
Supersedes	BS 3900-H7(2003) : 2003 97/120367 DC : DRAFT FEB 1997 14/30301174 DC : 0 BS EN ISO 4628-7:2003

Standards	Relationship
EN ISO 4628-7:2016	Identical
UNE-EN ISO 4628-7:2016	Identical
I.S. EN ISO 4628-7:2016	Identical
ISO 4628-7:2016	Identical
DIN EN ISO 4628-7:2016-07	Identical
NS EN ISO 4628-7 : 2003	Identical
NF EN ISO 4628-7 : 2016	Identical
NBN EN ISO 4628-7 : 2016	Identical
SN EN ISO 4628-7 : 2016	Identical
UNI EN ISO 4628-7 : 2007	Identical
NEN EN ISO 4628-7 : 2016	Identical

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