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

This part of EN 927 addresses performance criteria for coating systems on exterior wood. Performance requirements are specified according to the categories of 'end use' and 'exposure conditions' (defined in EN 927-1) in terms of the results of natural weathering performance testing carried out in accordance with EN 927-3. A mandatory water permeability test in accordance with EN 927-5 is also specified. Additional optional tests are identified which may be used by suppliers to provide voluntary additional information, to a standardized format, on aspects of performance relevant to specific building components such as windows.

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

Dieser Teil von EN 927 legt Leistungskriterien für Beschichtungssysteme auf Holz im Außenbereich fest. Die
Leistungskriterien werden nach den Anwendungskategorien und Beanspruchungsbedingungen (definiert in
EN 927-1) anhand der Ergebnisse von Freibewitterungsprüfungen nach EN 927-3 festgelegt. Eine
verbindliche Prüfung der Wasserdurchlässigkeit nach EN 927-5 wird ebenfalls beschrieben. Zusätzliche
freiwillige Prüfungen werden angegeben, die von Herstellern angewendet werden können, um auf genormter
Grundlage wahlweise zusätzliche Informationen über Leistungsaspekte bei speziellen Bauteilen wie Fenstern
zu erhalten.

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

La présente partie de l'EN 927 établit des critères de performance s'appliquant aux systèmes de revêtement pour le bois en extérieur. Les exigences de performances sont définies selon les catégories " d'utilisation finale " et de " conditions d'exposition " (définies dans l'EN 927-1) en fonction des résultats de l'essai de vieillissement naturel selon l'EN 927-3. Il est également obligatoire d'effectuer un essai de détermination de la perméabilité à l'eau selon l'EN 927-5. Des essais complémentaires facultatifs sont identifiés ; les fournisseurs peuvent les réaliser, sous une forme normalisée, pour donner volontairement des informations complémentaires sur des aspects des performances spécifiques à certains éléments du bâtiment, comme par exemple les fenêtres.

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

General Information

Status
Withdrawn
Publication Date
25-Apr-2006
Withdrawal Date
02-Sep-2014
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
03-Sep-2014

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Paints and varnishes - Coating materials and coating systems for exterior wood - Part 2: Performance specificationPeintures et vernis - Produits de peinture et systemes de revetement pour le bois en extérieur - Partie 2: Spécifications de performanceBeschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Teil 2: LeistungsanforderungenTa slovenski standard je istoveten z:EN 927-2:2006SIST EN 927-2:2006en87.04071.100.50ICS:SIST ENV 927-2:20011DGRPHãþDSLOVENSKI

STANDARDSIST EN 927-2:200601-julij-2006

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 927-2April 2006ICS 87.040Supersedes ENV 927-2:2000

English VersionPaints and varnishes - Coating materials and coating systemsfor exterior wood - Part 2: Performance specificationPeintures et vernis - Produits de peinture et systèmes derevêtement pour le bois en extérieur - Partie 2:Spécifications de performanceBeschichtungsstoffe - Beschichtungsstoffe undBeschichtungssysteme für Holz im Außenbereich - Teil 2:LeistungsanforderungenThis European Standard was approved by CEN on 9 March 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 927-2:2006: E

EN 927-2:2006 (E) 2 Contents page Foreword..........................................................................................................................................................3 1 Scope...................................................................................................................................................5 2 Normative references.........................................................................................................................5 3 Terms and definitions.........................................................................................................................5 4 Performance tests...............................................................................................................................5 5 Optional tests......................................................................................................................................7 6 Expression of results and interpretation..........................................................................................7 Annex A (informative)

Information and guidelines on interpretation.......................................................10 Bibliography...................................................................................................................................................14

EN 927-2:2006 (E) 3 Foreword This European Standard (EN 927-2:2006) 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 October 2006, and conflicting national standards shall be withdrawn at the latest by October 2006. This European Standard supersedes ENV 927-2:2000. 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 This second edition cancels and replaces the first edition (ENV 927-2:2000), which has been technically revised. The main changes are:  values for adhesion and maximum sum value in Table 1 were changed;  former Annex A was deleted and the former Annex B became Annex A. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EN 927-2:2006 (E) 4 Introduction This is one of a number of parts of EN 927. Part 1 addresses the issue of an unequivocal terminology for the wide variety of exterior coatings for wood that are now available. Part 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. EN 927-2 addresses this latter issue and sets specific performance criteria.

EN 927-2:2006 (E) 5

1 Scope This part of EN 927 specifies performance requirements for coating systems on exterior wood. Performance requirements are specified according to the categories of 'end use' and 'exposure conditions' (defined in EN 927-1) in terms of the results of natural weathering performance testing carried out in accordance with EN 927-3. A mandatory water permeability test in accordance with EN 927-5 is also specified. Additional optional tests are identified which may be used by suppliers to provide voluntary additional information, to a standardized format, on aspects of performance relevant to specific building components such as windows. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 927-1:1996, Paints and varnishes — Coating materials and coating systems for exterior wood — Part 1: Classification and selection EN 927-3:2000, 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 prEN ISO 4618:2004, Paints and varnishes — Terms and definitions (ISO/DIS 4618:2004) 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 927-1:1996 and

prEN ISO 4618:2004 apply. 4 Performance tests 4.1 Resistance to natural weathering 4.1.1 General The assessment of a coating material to this specification will require a natural weathering test to be carried out in accordance with EN 927-3, using a flat wood panel of pine (Pinus silvestris) with a planed surface. A manufacturer of a coating system that meets one or more of the performance profiles described in 4.1.2 can claim conformity to the specification, as described in Clause 6. If a coating system does not meet the performance criteria the manufacturer cannot claim full conformity but might provide information gained from one or more of the optional tests. The external durability of the coating system under test is assessed by a number of performance criteria. Guide values enable an assessment to be made of the suitability of the system for the proposed end-use. Comparative trials have shown that conformity to the criteria outlined below (Table 1) sets a performance standard capable of verification, but they do not in themselves constitute a certification procedure. Further guidance on the interpretation of the results is given in Annex A.

EN 927-2:2006 (E) 6 The severity of the exposure conditions is determined by reference to the performance of an Internal Comparison Product (ICP), which also serves as a reference standard for the optional evaluation of mould resistance. 4.1.2 Performance criteria The scores for the assessment criteria, blistering, cracking, flaking and adhesion (from EN 927-3) and the water absorption value (from EN 927-5), are interpreted as meeting, or not meeting the required standard, relative to the end-use category, according to the criteria given in Table 1. These rankings are relative to the exposure conditions as described in 4.1.3. Interpretation of criteria: (1) The first four values in each column each represent the maximum allowed for the arithmetic mean (to one decimal place) of the three replicates from the natural weathering test (EN 927-3). (2) The 'maximum sum value' is the limit which shall not be exceeded for the sum of the 12 (4 × 3) individual results. (3) The ‘maximum difference to qualify as valid test’, refers to the difference between the highest and lowest score in any of the individual test panels. If this value is exceeded the test is declared invalid and shall be repeated. (4) The ‘water absorption value’ is the maximum allowed for the arithmetic mean of the five replicates as determined by the procedure described in EN 927-5. (5) If a coating system does not meet all of these profiles the manufacturer cannot claim full conformity in any of the three end use categories. Table 1 — Limit values for performance criteria - Natural weathering and water absorption

'Stable' 'Semi-stable' 'Non-stable' Blistering 0,3 0,7 1 Cracking 0,7 1,7 3 Flaking 0,3 0,7 1,3 Adhesion 1 1 1 Maximum sum value 7 12 19 Maximum difference to qualify as valid test 2 3 4 EN 927-5, water absorption value ≤175 g/m2 a ≤ 250 g/m2 a no limit a Non-mandatory values which will be revised/ratified in the light of ongoing work in CEN/TC 139/WG 2.

NOTE Test precision An estimate of the standard deviation of the weathering test method was made in a large comparative exercise carried out by members of the CEN Working Group. The findings of this exercise have been incorporated into the criteria matrix so that the underlying target values incorporate a tolerance to allow for variation in the performance of panel replicates. Attention has also been given to the expected distribution of results for a given test. Thus for example an arithmetic mean criterion of 1,3 for 'cracking' could be achieved as (1,1,2), (0,1,3) or (0,0,4). The ‘Maximum difference’ criteria considers the probability of such scores occurring, and rules out those which are well outside the expected distribution.

EN 927-2:2006 (E) 7 4.1.3 Exposure conditions If the internal comparison product (ICP – see EN 927-3) meets the weathering criteria for the ‘stable’ end-use category the exposure conditions are rated as 'medium'. If it does not meet these criteria the conditions are rated 'severe' (see EN 927-1). Exposure conditions during the test are recorded in the ‘Expression of results’ (Clause 6). 4.1.4 Water permeability Water permeability shall be assessed in accordance with EN 927-5 and expressed as a 'water absorption value'. The criteria for each end-use category are given in Table 1. 5 Optional tests The test methods listed in Table 2 are recommended where additional information is required from the supplier of the coating system to meet specific end-user needs. They are not required for compliance with this European Standard, nevertheless when carried out they shall be reported in the format prescribed in Clause 6. Table 2 — Additional optional tests Test description Test method Blister box test any test method can be agreed, e.g. BS 7956:2000, Annex C Blocking any test method can be agreed Stackability EN ISO 4622 Compatibility with glazing (sealing) compounds and profiles Overcoat following suppliers recommendations Blue stain in service EN 152-1 and EN 152-2 Mould resistance value EN 927-3 and 6.2.1 Natural weathering with water trap EN 927-3:2000, Annex F Natural weathering with alternative substrates EN 927-3:2000, Annex F

6 Expression of results and interpretation 6.1 Mandatory tests The ratings achieved in the weathering and permeability tests shall be reported and expressed according to the conventions listed in Table 3 or Table 4. Manufacturers claiming conformity with this European Standard for a specified coating system shall on request supply a data sheet containing the results in this format. Manufacturers may at their discretion expand the table format to include information from Table 5.

EN 927-2:2006 (E) 8

Table 3 — Mandatory tests for claiming full conformity Test description Reporting convention Appearance definition Build, hiding power and gloss in accordance with EN 927-1 End use category or categories meeting full performance criteria ‘Stable’ and/or ‘Semi-stable’ and/or ‘Non-stable’ Exposure conditions ‘Medium’ or ‘’severe in accordance with 4.1.3

NOTE Some coating systems might meet more than one of the performance profiles. It is at the manufacture

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