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SLOVENSKI STANDARD
01-februar-2023
Nadomešča:
SIST EN 927-2:2014
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: EN 927-2:2022
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 927-2
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 87.040 Supersedes 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 European Standard was approved by CEN on 16 October 2022.
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, Türkiye 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 927-2:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Performance tests – Testing profiles . 7
5 Test overview . 9
5.1 Natural weathering. 9
5.1.1 General . 9
5.1.2 Performance criteria . 9
5.1.3 Exposure conditions . 10
5.1.4 Natural weathering – Alternative substrates . 10
5.1.5 Natural weathering – Alternative test piece . 10
5.2 Existing test methods . 10
5.2.1 Water permeability . 10
5.2.2 Artificial weathering . 10
5.2.3 Knot staining . 10
5.2.4 Wet adherence (double X-cut test) . 11
5.2.5 Wet adherence (pull-off test) . 11
5.2.6 Blocking . 11
5.2.7 Microfoam . 11
5.2.8 UV transmittance . 11
5.2.9 Impact test . 11
5.2.10 Tensile properties. 11
5.2.11 Film extensibility. 12
5.2.12 Tannin staining . 12
5.2.13 Fungal and algal growth . 12
6 Summary of test methods and reporting convention . 12
7 Expression of results and claiming conformity – Scope and reporting convention . 14
European foreword
This document (EN 927-2:2022) has been prepared by 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 May 2022, and conflicting national standards shall be
withdrawn at the latest by May 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes 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 specified in EN 927-1) have been updated to
include additional test methods;
b) Existing test methods (5.2) have been updated to include additional methods and 5.3 (Test methods
in preparation) has been deleted.
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
— Part 14: Determination of tensile properties of coating films
This document has been published as a CEN/TS in 2020.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Türkiye and the United
Kingdom.
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.
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 specified 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
CEN/TS 927-12:— , Paints and varnishes - Coating materials and coating systems for exterior wood - Part
12: Ultraviolet and visible radiation transmittance
Under preparation. Stage at the time of publication: FprCEN/TS 927-12:2022.
EN 927-13, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 13:
Assessm
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