EN 927-3:2012

Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3: Natural weathering test

This European Standard specifies a natural weathering test for exterior wood coating systems mainly intended for decoration and protection of planed and sawn wood.
The test provides a means of evaluating the performance of a wood coating system during outdoor exposure. It forms the basis for the performance specification in accordance with EN 927-2.

Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Teil 3: Freibewitterung

Diese Europäische Norm legt eine Freibewitterungsprüfung von Beschichtungssystemen für Holz im Außenbereich fest, die hauptsächlich zur Dekoration und zum Schutz von glattgehobeltem Schnittholz dienen.
Diese Prüfung dient zum Beurteilen des Verhaltens von Beschichtungssystemen für Holz, die dem Wetter ausgesetzt sind. Sie ist die Grundlage der Spezifikation nach EN 927-2.

Peintures et vernis - Produits de peinture et systèmes de peinture pour bois en extérieur - Partie 3: Essais de vieillissement naturel

La présente Norme européenne spécifie un essai de vieillissement naturel des systèmes de peinture pour le bois
en extérieur principalement prévus pour la décoration et la protection des bois sciés et rabotés.
L’essai fournit un moyen permettant d’évaluer les performances d’un système de peinture pour bois durant son
exposition en extérieur. Il sert de base pour l’élaboration de la spécification de performance selon l’EN 927-2.

Barve in laki - Premazi in premazni sistemi za zaščito lesa v zunanji uporabi - 3. del: Preskus s staranjem v naravnih razmerah

Ta evropski standard določa preskus s staranjem v naravnih razmerah za premazne sisteme za zaščito lesa v zunanji uporabi, katerih namen je okrasiti in zaščititi obeljen in žagan les. Preskus je sredstvo za ugotavljanje delovanja premaznega sistema za les, ko je izpostavljen zunanjim vplivom. Predstavlja podlago za zahteve učinkovitosti v skladu s standardom EN 927-2.

General Information

• Status: Withdrawn
• Publication Date: 24-Jul-2012
• Withdrawal Date: 17-Sep-2019
• ICS: 87.040 - Paints and varnishes
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139/WG 2 - Coating systems for wood
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 18-Sep-2019
• Ref Project: SIST EN 927-3:2012 - Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3: Natural weathering test

Relations

• Replaces: EN 927-3:2006 - Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3: Natural weathering test
• Effective Date: 24-Oct-2009
• Replaced By: EN 927-3:2019 - Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3: Natural weathering test
• Effective Date: 13-Sep-2017

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2012
1DGRPHãþD
SIST EN 927-3:2007
%DUYHLQODNL3UHPD]LLQSUHPD]QLVLVWHPL]D]DãþLWROHVDY]XQDQMLXSRUDEL
GHO3UHVNXVVVWDUDQMHPYQDUDYQLKUD]PHUDK
Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3:
Natural weathering test
Lacke und Anstrichstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Teil 3: Freibewitterung
Peintures et vernis - Produits de peinture et systèmes de peinture pour bois en extérieur
- Partie 3: Essais de vieillissement naturel
Ta slovenski standard je istoveten z: EN 927-3:2012
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.

EUROPEAN STANDARD
EN 927-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2012
ICS 87.040 Supersedes EN 927-3:2006
English Version
Paints and varnishes - Coating materials and coating systems
for exterior wood - Part 3: Natural weathering test
Peintures et vernis - Produits de peinture et systèmes de Beschichtungsstoffe - Beschichtungsstoffe und
peinture pour bois en extérieur - Partie 3: Essais de Beschichtungssysteme für Holz im Außenbereich - Teil 3:
vieillissement naturel Freibewitterung
This European Standard was approved by CEN on 9 June 2012.

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

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 927-3:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Principle .6
4 Apparatus and materials .6
5 Sampling .6
6 Test panels .7
6.1 Wood .7
6.2 Preparation and selection of wood panels .8
6.3 Preparation of coated panels .8
6.3.1 Wood conditioning .8
6.3.2 Preparation of panels for the test coating .8
6.3.3 Preparation of panels for the Internal Comparison Product (ICP) .8
6.3.4 Sealing and ageing .8
6.3.5 Thickness of the coating .9
7 Procedure . 10
7.1 General . 10
7.2 Examination before exposure . 10
7.3 Exposure . 10
7.4 Examination after exposure . 10
7.4.1 Examination on the exposure racks . 10
7.4.2 Laboratory examination of unwashed panels . 10
7.4.3 Laboratory examination of washed panels . 11
8 Precision data . 11
9 Expression of results and test report . 11
Annex A (normative) Internal Comparison Product (ICP) alkyd stain . 12
Annex B (normative) Details of test methods . 14
B.1 Gloss and change of gloss . 14
B.2 Colour and colour change . 14
B.3 Blistering . 14
B.4 Flaking . 14
B.5 Mould growth . 14
B.6 Cracking . 15
B.7 Chalking . 15
B.8 General appearance . 15
B.9 Adhesion . 15
B.9.1 General . 15
B.9.2 Apparatus . 15
B.9.3 Procedure . 15
B.10 Test for abnormally porous wood . 16
B.11 Test for heartwood in pine . 16
Annex C (normative) Assessment requirements for panels of test coatings and ICP . 17
Annex D (informative) Suggested format for a test report . 18
Annex E (informative) Optional tests including variations to standard weathering test procedure
to obtain additional information on coating performance . 21
E.1 Principle. 21
E.2 Tests on alternative wood substrates . 21
E.3 Tests with water trap . 21
E.3.1 Apparatus and materials. 21
E.3.2 Preparation . 22
E.3.3 Panel assessment . 22
E.4 Tests with back sealing of the panels . 23
Annex F (informative) Explanatory notes . 24
F.1 Natural weathering test . 24
F.2 Validity of test reports . 24
F.2.1 System . 24
F.2.2 Climate and region . 24
Annex G (informative) Precision data . 25
Bibliography . 26

Foreword
This document (EN 927-3:2012) 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 January 2013, and conflicting national standards shall be withdrawn at
the latest by January 2013.
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 927-3:2006.
The main technical changes are:
a) Precision data were added in an informative Annex G;
b) Using the multi-blade cutting tool for cross-cut test is allowed.
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.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

1 Scope
This European Standard specifies a natural weathering test for exterior wood coating systems mainly intended
for decoration and protection of planed and sawn wood.
The test provides a means of evaluating the performance of a wood coating system during outdoor exposure.
It forms the basis for the performance specification in accordance with EN 927-2.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN ISO 1513, Paints and varnishes — Examination and preparation of test samples (ISO 1513)
EN ISO 2409, Paints and varnishes — Cross-cut test (ISO 2409)
EN ISO 2431, Paints and varnishes — Determination of flow time by use of flow cups (ISO 2431)
EN ISO 2808
...