EN 927-11:2020
(Main)Paints and varnishes - Coating materials and coating systems for exterior wood - Part 11: Assessment of air inclusions/microfoam in coating films
Paints and varnishes - Coating materials and coating systems for exterior wood - Part 11: Assessment of air inclusions/microfoam in coating films
This document specifies a laboratory test method for assessing microfoam in coating films on wood components. Samples are taken from finished wood components that are produced in a production plant, by craftsmen or a laboratory.
The test method can be used for further evaluation together with the performance specification given in EN 927-2. The amount and size of microfoam depends upon the coating material, the substrate and the application process and conditions.
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Teil 11: Beurteilung von Gaseinschlüssen/Mikroschaum in Beschichtungen
Dieses Dokument legt ein Laborprüfverfahren zum Beurteilen von Mikroschaum in Beschichtungsfilmen auf Holzbauteilen fest. Proben werden von fertigen Holzbauteilen genommen, die in einer Produktionsanlage, von Facharbeitern oder einem Labor hergestellt werden.
Das Prüfverfahren kann zusammen mit der in EN 927-2 angegebenen Leistungsanforderung für die weitere Bewertung verwendet werden. Die Menge und Größe des Mikroschaums hängt vom Beschichtungsstoff, dem Substrat, dem Beschichtungsprozess und den Bedingungen ab.
Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en extérieur - Partie 11 : Évaluation des bulles et microbulles d'air dans les feuils de peinture
Le présent document spécifie une méthode d’essai en laboratoire relative à l’évaluation des microbulles dans les feuils de peinture sur des éléments de bois. Des échantillons sont prélevés dans des éléments de bois finis produits en usine par du personnel spécialisé ou en laboratoire.
La méthode d’essai peut être utilisée pour une évaluation ultérieure, conjointement avec les spécifications de performance données dans l’EN 927-2. La quantité et la taille des microbulles dépendent du matériau de la peinture, du support ainsi que des conditions et du processus d’application.
Barve in laki - Premazi in premazni sistemi za zaščito lesa za zunanjo uporabo - 11. del: Ocenjevanje obsežnosti zračnih vključkov/mikropenjenja v filmih premazov
General Information
- Status
- Published
- Publication Date
- 21-Apr-2020
- Withdrawal Date
- 30-Oct-2020
- Technical Committee
- CEN/TC 139 - Paints and varnishes
- Drafting Committee
- CEN/TC 139/WG 2 - Coating systems for wood
- Current Stage
- 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
- Start Date
- 02-Dec-2025
- Completion Date
- 02-Dec-2025
Relations
- Effective Date
- 11-May-2020
Overview
EN 927-11:2020 - "Paints and varnishes - Coating materials and coating systems for exterior wood - Part 11" specifies a laboratory test method for assessing air inclusions (microfoam) in coating films on exterior wood components. The standard defines how to prepare cross‑section samples from finished wood components (from production plants, craftsmen or laboratories), examine them microscopically, and report the frequency of microfoam. It is intended for use alongside performance specifications such as EN 927-2.
Key topics and technical requirements
- Scope: Assessment of spherical or ellipsoidal gas inclusions (microfoam) visible at a minimum of 80× magnification.
- Sample collection: Three test samples taken at least 200 mm from corners or end grain; full cross sections are recommended.
- Sample preparation: Clean cross sections produced with a razor blade or microtome over at least 15 mm; mark a 10 mm test distance on each cross section.
- Microscopy: Count all air inclusions cut through within the 10 mm distance using a light microscope (≥80×). For transparent or semi‑transparent coatings, use a dye (e.g., marker pen) to distinguish cut‑through inclusions.
- Calculation: Report the mean number of air inclusions per centimetre calculated from the three samples.
- Test report content: Must include reference to EN 927-11:2020, laboratory and client details, apparatus and magnification, sampling dates/personnel, test results and report authorization.
- Limitations: The method counts inclusions on cross sections but does not measure true bubble size (diameter depends on where a bubble is cut).
Applications
- Quality control of exterior wood coatings to detect manufacturing or application defects related to microfoam.
- Comparative evaluation of coating materials, substrates and application processes (spraying, brushing, rolling) to reduce trapped air and improve durability.
- Support for conformity and performance assessment when used with EN 927-2 specifications.
- Root‑cause analysis for defects affecting gloss, colour, vapour/light transmission and mechanical properties where microfoam is suspected.
Who should use this standard
- Coating manufacturers and formulators
- Wood coating production plants and line QC teams
- Independent testing laboratories and certification bodies
- Surface treatment contractors and craftsmen involved in exterior wood finishing
- Product developers and failure‑analysis engineers
Related standards
- EN 927-2 (performance specifications for coatings on exterior wood)
- EN 927 series (other parts addressing test methods and performance)
- Supersedes CEN/TS 16358:2012
Keywords: EN 927-11:2020, microfoam, air inclusions, coating films, exterior wood, paints and varnishes, test method, EN 927-2, quality control.
Frequently Asked Questions
EN 927-11:2020 is a standard published by the European Committee for Standardization (CEN). Its full title is "Paints and varnishes - Coating materials and coating systems for exterior wood - Part 11: Assessment of air inclusions/microfoam in coating films". This standard covers: This document specifies a laboratory test method for assessing microfoam in coating films on wood components. Samples are taken from finished wood components that are produced in a production plant, by craftsmen or a laboratory. The test method can be used for further evaluation together with the performance specification given in EN 927-2. The amount and size of microfoam depends upon the coating material, the substrate and the application process and conditions.
This document specifies a laboratory test method for assessing microfoam in coating films on wood components. Samples are taken from finished wood components that are produced in a production plant, by craftsmen or a laboratory. The test method can be used for further evaluation together with the performance specification given in EN 927-2. The amount and size of microfoam depends upon the coating material, the substrate and the application process and conditions.
EN 927-11:2020 is classified under the following ICS (International Classification for Standards) categories: 85.040 - Pulps; 87.040 - Paints and varnishes. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 927-11:2020 has the following relationships with other standards: It is inter standard links to CEN/TS 16358:2012. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 927-11:2020 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2020
Nadomešča:
SIST-TS CEN/TS 16358:2012
Barve in laki - Premazi in premazni sistemi za zaščito lesa za zunanjo uporabo - 11.
del: Ocenjevanje obsežnosti zračnih vključkov/mikropenjenja v filmih premazov
Paints and varnishes - Coating materials and coating systems for exterior wood - Part
11: Assessment of air inclusions/microfoam in coating films
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Teil 11: Beurteilung von Gaseinschlüssen/Mikroschaum in
Beschichtungen
Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en
extérieur - Partie 11 : Évaluation des bulles et microbulles d'air dans les feuils de
peinture
Ta slovenski standard je istoveten z: EN 927-11:2020
ICS:
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 927-11
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 87.040 Supersedes CEN/TS 16358:2012
English Version
Paints and varnishes - Coating materials and coating
systems for exterior wood - Part 11: Assessment of air
inclusions/microfoam in coating films
Peintures et vernis - Produits de peinture et systèmes Beschichtungsstoffe - Beschichtungsstoffe und
de peinture pour le bois en extérieur - Partie 11 : Beschichtungssysteme für Holz im Außenbereich - Teil
Évaluation des bulles et microbulles d'air dans les 11: Beurteilung von Gaseinschlüssen/Mikroschaum in
feuils de peinture Beschichtungen
This European Standard was approved by CEN on 1 December 2019.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 927-11:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Procedure. 4
6 Test report . 5
European foreword
This document (EN 927-11:2020) has been prepared by Technical Committee CEN/TC 139 “Paints and
varnishes”, the secretariat of which is held by DIN.
This European Standard shal
...
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