Paints and varnishes - Coating materials and coating systems for exterior wood - Part 2: Performance specification

This document addresses performance criteria for coating systems on exterior wood. Performance requirements are specified according to three categories of end use (defined in EN 927 1) in terms of two mandatory tests, namely natural weathering performance testing carried out in accordance with EN 927 3, and water permeability in accordance with EN 927 5. Additional optional tests (non-mandatory) are tabled which can be used by suppliers, or for specification purposes, to provide additional information, to a standardized format, on aspects of performance relevant to specific situations. The majority of test methods are drawn from EN 927 (all parts), but where relevant additional tests from other national and international sources are used.
Requirements for claiming conformity with this document are defined and provide flexibility for different situations and can also provide a basis for certification.

Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Teil 2: Leistungsanforderungen

Dieses Dokument legt Leistungskriterien für Beschichtungssysteme auf Holz im Außenbereich fest. Die Leistungsanforderungen werden anhand der Ergebnisse zweier Pflichtprüfungen – der Freibewitterungsprüfung nach EN 927 3 und Wasserdurchlässigkeitsprüfung nach EN 927 5 – nach den drei (in EN 927 1 angegebenen) Anwendungskategorien festgelegt. Es werden zusätzliche freiwillige (nicht verpflichtende) Prüfungen in Tabellenform angegeben, die von Anbietern oder für Spezifikationszwecke angewendet werden können, um auf genormter Grundlage zusätzliche Informationen über Leistungsaspekte bei speziellen Anwendungen zu erhalten. Der Großteil der Prüfverfahren stammt aus der Normenreihe EN 927 (alle Teile), ggf. werden jedoch auch zusätzliche Prüfungen aus anderen nationalen und internationalen Quellen angewendet.
Es werden Anforderungen für das Erheben des Anspruches auf Konformität mit diesem Dokument festgelegt, um Flexibilität in unterschiedlichen Situationen sowie eine Grundlage für die Zertifizierung zu bieten.

Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en extérieur - Partie 2: Spécifications de performance

Le présent document traite des critères de performance s’appliquant aux systèmes de peinture pour le bois en extérieur. Les exigences de performance sont spécifiées selon trois catégories d’usage final (définies dans l’EN 927 1) en termes de deux essais obligatoires, à savoir l’essai de vieillissement naturel réalisé conformément à l’EN 927 3 et l’essai de perméabilité à l’eau réalisé conformément à l’EN 927 5. Les essais supplémentaires facultatifs (non obligatoires) sont indiqués dans des tableaux et peuvent être utilisés par les fournisseurs, ou à des fins de spécification, pour fournir des informations supplémentaires, selon un format normalisé, sur des aspects des performances pertinents pour des situations spécifiques. La majorité des méthodes d’essai sont extraites de la série EN 927 (toutes les parties) mais, le cas échéant, des essais supplémentaires pertinents issus d’autres sources nationales et internationales sont utilisés.
Les exigences relatives à la déclaration de conformité au présent document sont définies, offrent une certaine souplesse pour différentes situations et peuvent également servir de base de certification.

Barve in laki - Premazi in premazni sistemi za zaščito lesa za zunanjo uporabo - 2. del: Specifikacija lastnosti

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SLOVENSKI STANDARD
oSIST prEN 927-2:2021
01-september-2021

Barve in laki - Premazi in premazni sistemi za zaščito lesa za zunanjo uporabo - 2.

del: Specifikacija lastnosti

Paints and varnishes - Coating materials and coating systems for exterior wood - Part 2:

Performance specification
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Teil 2: Leistungsanforderungen

Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en

extérieur - Partie 2: Spécifications de performance
Ta slovenski standard je istoveten z: prEN 927-2
ICS:
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
oSIST prEN 927-2:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 927-2:2021
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oSIST prEN 927-2:2021
DRAFT
EUROPEAN STANDARD
prEN 927-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2021
ICS 87.040 Will supersede EN 927-2:2014
English Version
Paints and varnishes - Coating materials and coating
systems for exterior wood - Part 2: Performance
specification

Peintures et vernis - Produits de peinture et systèmes Beschichtungsstoffe - Beschichtungsstoffe und

de peinture pour le bois en extérieur - Partie 2: Beschichtungssysteme für Holz im Außenbereich - Teil

Spécifications de performance 2: Leistungsanforderungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 139.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 927-2:2021 E

worldwide for CEN national Members.
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oSIST prEN 927-2:2021
prEN 927-2:2021 (E)
Contents Page

Foreword .......................................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 6

4 Performance tests – Testing profiles ....................................................................................................... 6

5 Test overview ................................................................................................................................................... 7

5.1 Natural weathering......................................................................................................................................... 7

5.1.1 General ................................................................................................................................................................ 7

5.1.2 Performance criteria ..................................................................................................................................... 8

5.1.3 Exposure conditions ....................................................................................................................................... 8

5.1.4 Natural weathering – Alternative substrates ........................................................................................ 9

5.1.5 Natural weathering – Alternative test piece .......................................................................................... 9

5.2 Existing test methods ..................................................................................................................................... 9

5.2.1 Water permeability ........................................................................................................................................ 9

5.2.2 Artificial weathering ...................................................................................................................................... 9

5.2.3 Knot staining ..................................................................................................................................................... 9

5.2.4 Wet adherence (double X-cut test) ........................................................................................................... 9

5.2.5 Wet adherence (pull-off test) ...................................................................................................................... 9

5.2.6 Blocking ........................................................................................................................................................... 10

5.2.7 Tannin staining ............................................................................................................................................. 10

5.2.8 Microfoam ....................................................................................................................................................... 10

5.2.9 UV transmittance .......................................................................................................................................... 10

5.2.10 Film extensibility.......................................................................................................................................... 10

5.2.11 Impact test ...................................................................................................................................................... 10

5.2.12 Fungal and algal growth ............................................................................................................................ 10

6 Summary of test methods and reporting convention ..................................................................... 10

7 Expression of results and claiming conformity – Scope and reporting convention ............. 11

Bibliography ................................................................................................................................................................. 13

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oSIST prEN 927-2:2021
prEN 927-2:2021 (E)
Foreword

This document (prEN 927-2:2021) has been prepared by Technical Committee CEN/TC 139 “Paints and

varnishes”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 927-2:2014.

The following significant technical changes have been made with respect to EN 927-2:2014:

a) test profiles for the three main end-use categories (as defined in EN 927-1) have been updated to

include additional test methods;

b) Annex A has been deleted; further information on test methods is found in Clause 5, or the referenced

test methods themselves.

EN 927 consists of the following parts under the general title Paints and varnishes — Coating materials

and coating systems for exterior wood,
— Part 1: Classification and selection
— Part 2: Performance specification
— Part 3: Natural weathering test
— Part 5: Assessment of the liquid water permeability

— Part 6: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water

— Part 7: Assessment of knot staining resistance of wood coatings

— Part 8: Determination of the adherence of paint on wood by means of a double X-cut test

— Part 9: Determination of pull-off strength after water exposure
— Part 10: Resistance to blocking of paints and varnishes on wood
— Part 11: Assessment of air inclusions/microfoam in coating films
— Part 12: Ultraviolet and visible radiation transmittance
— Part 13: Assessment of resistance to impact of a coating on a wooden substrate

Other parts are under preparation in CEN/TC 139/WG2 in 2021. They have not yet been assigned a

number in the 927-series: Assessment of tannin staining, Assessment of film extensibility by indentation

of a coating on a wooden substrate, Assessment of end grain sealing performance, Determination of

tensile properties of a coating film.
The method has the status of a technical specification (TS) in 2021.
The method has the status of a prEN in 2021.
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oSIST prEN 927-2:2021
prEN 927-2:2021 (E)
Introduction

This document is one of a number of parts of EN 927. EN 927-1 addresses the issue of terminology for

the wide variety of exterior coatings for wood that are now available. EN 927-1 also provides a

framework for communicating information on the suitability of a coating for particular specific end-use

categories. Improved communication is beneficial in the removal of technical barriers to trade. However,

there remains the problem of comparing products tested, or likely to be exposed, in different climatic

regions, and the relevance of tests for different categories of end-use. This document addresses these

issues and sets a limited number of mandatory performance criteria combined with optional tests that

can provide additional information to a standardized format.
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oSIST prEN 927-2:2021
prEN 927-2:2021 (E)
1 Scope

This document addresses performance criteria for coating systems on exterior wood. Performance

requirements are specified according to three categories of end use (defined in EN 927-1) in terms of two

mandatory tests, namely natural weathering performance testing carried out in accordance with

EN 927-3, and water permeability in accordance with EN 927-5. Additional optional tests (non-

mandatory) are tabled which can be used by suppliers, or for specification purposes, to provide additional

information, to a standardized format, on aspects of performance relevant to specific situations. The

majority of test methods are drawn from EN 927 (all parts), but where relevant additional tests from

other national and international sources are used.

Requirements for claiming conformity with this document are defined and provide flexibility for different

situations and can also provide a basis for certification.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 927-1:2013, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 1:

Classification and selection

EN 927-3:2019, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3:

Natural weathering test

EN 927-5, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 5:

Assessment of the liquid water permeability

EN 927-6, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 6: Exposure

of wood coatings to artificial weathering using fluorescent UV lamps and water

EN 927-7, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 7:

Assessment of knot staining resistance of wood coatings

CEN/TS 927-8, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 8:

Determination of the adhesion on wood after water exposure by a double-X-cut test

CEN/TS 927-9, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 9:

Determination of pull-off strength after water exposure

EN 927-10, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 10:

Resistance to blocking of paints and varnishes on wood

EN 927-11, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 11:

Assessment of air inclusions/microfoam in coating films

prEN 927-12, Paints and varnishes - Coating materials and coating systems for exterior wood Part 12:

Ultraviolet and visible radiation transmittance

EN 927-13, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 13:

Assessment of resistance to impact of a coating on a wooden substrate

EN 16492, Paints and varnishes - Evaluation of the surface disfigurement caused by fungi and algae on

coatings
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oSIST prEN 927-2:2021
prEN 927-2:2021 (E)

CEN/TS 16360, Paints and varnishes - Coating materials and coating systems for exterior wood -

Assessment of film extensibility by indentation of a coating on a wooden substrate

CEN/TS 16498, Paints and varnishes - Coating materials and coating systems for exterior wood -

Assessment of tannin staining
EN ISO 4618, Paints and varnishes - Terms and definitions (ISO 4618)

EN ISO 7783, Paints and varnishes - Determination of water-vapour transmission properties - Cup method

(ISO 7783)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 927-1 and EN ISO 4618 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Performance tests – Testing profiles
EN 927-1 classifies exterior wood coatings according
...

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