EN 927-6:2018

SLOVENSKI STANDARD
01-marec-2019
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SIST EN 927-6:2007
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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
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Teil 6: Künstliche Bewitterung von Holzbeschichtungen mit
fluoreszierenden UV-Lampen und Wasser
Peintures et vernis - Produits de peinture et systèmes de peinture pour bois en extérieur
- Partie 6 : Vieillissement artificiel des revêtements pour bois par exposition à des
lampes UV fluorescentes et à de l'eau
Ta slovenski standard je istoveten z: EN 927-6:2018
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD 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 927-6
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2018
EUROPÄISCHE NORM
ICS 87.040 Supersedes EN 927-6:2006
English Version
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
Peintures et vernis - Produits de peinture et systèmes Beschichtungsstoffe - Beschichtungsstoffe und
de peinture pour bois en extérieur - Partie 6 : Beschichtungssysteme für Holz im Außenbereich - Teil
Vieillissement artificiel des revêtements pour bois par 6: Künstliche Bewitterung von Holzbeschichtungen mit
exposition à des lampes UV fluorescentes et à de l'eau fluoreszierenden UV-Lampen und Wasser
This European Standard was approved by CEN on 9 April 2018.

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, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 927-6:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Principle . 8
5 Apparatus . 8
5.1 Test chamber . 8
5.2 Lamps . 8
5.3 Device for wetting the test panels . 8
5.4 Black panel thermometer . 8
5.5 Irradiance control . 8
6 Test panels . 9
6.1 Wood . 9
6.2 Preparation and selection of wood panels . 10
6.3 Preparation of coated panels . 10
6.3.1 Wood conditioning . 10
6.3.2 Preparation of panels for the test coating . 10
6.3.3 Conditioning . 10
7 Procedure. 10
7.1 Examination before exposure . 10
7.2 Mounting the test panels . 11
7.3 Exposure . 11
7.3.1 Exposure cycle . 11
7.3.2 Sample rotation and maintenance . 11
7.3.3 Duration of test . 11
7.4 Examination of test panels . 11
8 Precision . 12
9 Expression of results and test report . 14
Annex A (normative) Details of the test methods . 15
A.1 Gloss and change of gloss . 15
A.2 Colour and colour change. 15
A.3 Blistering . 15
A.4 Flaking . 15
A.5 Cracking . 15
A.6 Chalking . 15
A.7 General appearance . 16
A.8 Adhesion . 16
Annex B (informative) Explanatory notes . 17
B.1 Explanation of exposure cycle . 17
B.2 Reproducibility . 17
B.3 Correlation to natural weathering . 17
B.4 Dependency on wood species and substrate . 17
B.5 Recommendation of periodical performance assessments . 17
Annex C (informative) Test for heartwood in pine . 18
Annex D (informative) Water treatment, devices for water purification . 19
Annex E (normative) Test for abnormally porous wood . 20
Annex F (informative) Alternative procedure for preparation and coating of panels . 21
Annex G (informative) Determination of adhesive strength of tape on test surface . 22
Bibliography . 23
European foreword
This document (EN 927-6:2018) 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 April 2019, and conflicting national standards shall be
withdrawn at the latest by April 2019.
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 927-6:2006.
The main technical changes are:
a) update of Normative references;
b) introduction of a new clause on precision (8);
c) new informative Annex G for the determination of the adhesive strength of the tape on test surface.
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.
The following Technical Specifications are published in this context:
CEN/TS 16358, Paints and varnishes — Coating materials and coating systems for exterior wood —
Assessment of air inclusions/microfoam in coating films
CEN/TS 16359, Paints and varnishes — Coating materials and coating systems for exterior wood —
Assessment of knot staining resistance of wood coatings
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
CEN/TS 16499, Paints and varnishes — Coating materials and coating systems for exterior wood —
Resistance to blocking of paints and varnishes on wood
CEN/TS 16700, Paints and varnishes — Coating materials and coating systems for exterior wood —
Assessment of resistance to impact of a coating on a wooden substrate
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Introduction
Coatings from paints, varnishes and similar materials are weathered in a laboratory in order to
accelerate ageing processes (caused by temperature, wetness and irradiation) which occur during
natural weathering. Generally, a simple accelerating ratio between ageing durin
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