EN ISO 4628-7:2016
(Main)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
- Abstract
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.
- Status
- Published
- Publication Date
- 09-Feb-2016
- Withdrawal Date
- 30-Aug-2016
- Technical Committee
- CEN/TC 139 - Paints and varnishes
- Drafting Committee
- CEN/TC 139 - Paints and varnishes
- Current Stage
- 6060 - Definitive text made available (DAV) - Publishing
- Start Date
- 10-Feb-2016
- Completion Date
- 10-Feb-2016
Overview
EN ISO 4628-7:2016 (ISO 4628-7:2016) - published by CEN - defines the velvet method for assessing the degree of chalking on exterior paints and varnishes. The method is intended mainly for rough surfaces (roughness > segment 4 of comparator G per ISO 8503‑1) and is suitable for coatings on mineral substrates such as fibre cement, brick, concrete and renderings. It is a relative, visual ranking technique recommended for laboratory and on‑site evaluation by experienced operators.
Key topics and technical requirements
- Scope & limits
- Designed primarily for rough surfaces; for smooth surfaces ISO 4628‑6 (tape method) is preferable.
- Applicable to white or coloured exterior coatings and coating systems on mineral substrates.
- The method is a relative ranking and not intended as a contractual quantitative agreement unless specifically defined between parties.
- Principle
- Loosely adherent powder (chalking) is removed from the coating using a fabric (velvet, black wool felt, velveteen for light coatings; white fabric for dark coatings). The collected powder is visually rated against a standard scale.
- Procedure highlights
- Assessments should be made under appropriate illumination per ISO 13076.
- Perform assessments in duplicate (unless agreed otherwise).
- Using firm finger pressure, press the fabric against the surface, rotate 180°, remove fabric and assess under diffuse light.
- A mechanical wiping apparatus may be used if results are comparable.
- Rating scale
- Numerical ratings 0–5: 0 = unchanged (no perceptible chalking) to 5 = severe (intense chalking).
- Use pictorial reference standards (comparable examples are provided and harmonized with ISO 4628‑6).
- Reporting requirements
- Test report must identify the coating, reference ISO 4628‑7, describe surface/type/location, give numerical rating (mean, range, number of assessments), fabric used, method (finger or apparatus), deviations, anomalies, and date.
Applications and users
- Practical for quality control, R&D, weathering studies, and on‑site condition surveys of exterior coatings on masonry, concrete and similar substrates.
- Typical users: paint formulators, coatings laboratories, specifiers, façade inspectors, contractors, and asset managers who need a standardized visual method to monitor chalking and surface degradation.
Related standards
- ISO 4628‑1 - General designation system for defects and appearance changes.
- ISO 4628‑6:2011 - Chalking assessment by tape method (preferred for smooth surfaces).
- ISO 13076 - Lighting and procedure for visual assessments of coatings.
- ISO 8503‑1 - Surface roughness comparators (reference for roughness segments).
Keywords: EN ISO 4628-7:2016, ISO 4628-7, velvet method, chalking assessment, paints and varnishes, degradation of coatings, exterior coatings, rough surfaces.
Relations
- Effective Date
- 16-Apr-2014
- Refers
ISO 13076:2012 - Paints and varnishes — Lighting and procedure for visual assessments of coatings - Effective Date
- 09-Feb-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 12-Feb-2026
Frequently Asked Questions
EN ISO 4628-7:2016 is a standard published by the European Committee for Standardization (CEN). Its full title is "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)". This standard covers: 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.
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.
EN ISO 4628-7:2016 is classified under the following ICS (International Classification for Standards) categories: 87.040 - Paints and varnishes. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 4628-7:2016 has the following relationships with other standards: It is inter standard links to EN ISO 4628-7:2003, ISO 13076:2012, EN ISO 12944-2:2017, EN ISO 14713-3:2009, EN ISO 12944-1:2017, EN ISO 28721-4:2015, EN ISO 14713-2:2009, EN ISO 14713-1:2009, EN ISO 28721-4:2012, EN ISO 12944-9:2018, EN ISO 13628-1:2005, EN ISO 12944-3:2017, EN 15655-2:2020, EN 1062-11:2002, ISO 4628-7:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 4628-7:2016 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2016
1DGRPHãþD
SIST EN ISO 4628-7:2004
Barve in laki - Ovrednotenje propadanja premazov - Ugotavljanje obsega in
velikosti poškodb ter intenzitete enakomernih sprememb videza - 7. del:
Ocenjevanje stopnje kredanja po postopku z žametom (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)
Beschichtungsstoffe - Beurteilung von Beschichtungsschäden - Bewertung der Menge
und der Größe von Schäden und der Intensität von gleichmäßigen Veränderungen im
Aussehen - Teil 7: Bewertung des Kreidungsgrades nach dem Samtverfahren (ISO 4628
-7:2016)
Peintures et vernis - Evaluation de la dégradation des revêtements - Désignation de la
quantité et de la dimension des défauts, et de l'intensité des changements uniformes
d'aspect - Partie 7: Evaluation du degré de farinage selon la méthode du morceau de
velours (ISO 4628-7:2016)
Ta slovenski standard je istoveten z: EN ISO 4628-7:2016
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 4628-7
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2016
EUROPÄISCHE NORM
ICS 87.040 Supersedes EN ISO 4628-7:2003
English Version
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)
Peintures et vernis - Évaluation de la dégradation des Beschichtungsstoffe - Beurteilung von
revêtements - Désignation de la quantité et de la Beschichtungsschäden - Bewertung der Menge und der
dimension des défauts, et de l'intensité des Größe von Schäden und der Intensität von
changements uniformes d'aspect - Partie 7: Évaluation gleichmäßigen Veränderungen im Aussehen - Teil 7:
du degré de farinage selon la méthode du morceau de Bewertung des Kreidungsgrades nach dem
velours (ISO 4628-7:2016) Samtverfahren (ISO 4628-7:2016)
This European Standard was approved by CEN on 19 December 2015.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4628-7:2016 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 4628-7:2016) has been prepared by Technical Committee ISO/TC 35 "Paints
and varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2016, and conflicting national standards shall
be withdrawn at the latest by August 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 4628-7:2003.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4628-7:2016 has been approved by CEN as EN ISO 4628-7:2016 without any
modification.
INTERNATIONAL ISO
STANDARD 4628-7
Second edition
2016-01-15
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
Peintures et vernis — Évaluation de la dégradation des revêtements
— Désignation de la quantité et de la dimension des défauts, et de
l’intensité des changements uniformes d’aspect —
Partie 7: Évaluation du degré de farinage selon la méthode du
morceau de velours
Reference number
ISO 4628-7:2016(E)
©
ISO 2016
ISO 4628-7:2016(E)
© ISO 2016, Published in Switzerland
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ISO 4628-7:2016(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Materials . 2
6 Assessment . 2
7 Test report . 3
Bibliography . 5
ISO 4628-7:2016(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committee
...