1、October 2012 Translation by DIN-Sprachendienst.English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 87.040!$.C“1921132www.din.deDDIN EN 927-3Paints and varnishes Coating materials and coating systems for exterior wood Part 3: Natural weathering test;English version EN 927-3:2012,English translation of DIN EN 927-3:2012-10Beschichtungsstoffe Beschichtungsstoffe und Beschichtungssysteme fr Holz im
3、 Auenbereich Teil 3: Freibewitterung;Englische Fassung EN 927-3:2012,Englische bersetzung von DIN EN 927-3:2012-10Peintures et vernis Produits de peinture et systmes de peinture pour bois en extrieur Partie 3: Essais de vieillissement naturel;Version anglaise EN 927-3:2012,Traduction anglaise de DIN
4、 EN 927-3:2012-10SupersedesDIN EN 927-3:2007-03www.beuth.deDocument comprises 28 pagesIn case of doubt, the German-language original shall be considered authoritative.10.12 DIN EN 927-3:2012-10 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Co
5、mmittee CEN/TC 139 “Paints and varnishes”, Working Group WG 2 “Coating systems for wood” (both secretariats are held by DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Beschichtungsstoffe und Beschichtungen (Coatings and Coating Materials Standards Comm
6、ittee), Working Committee NA 002-00-15 AA Bautenbeschichtungen. Amendments This standard differs from DIN EN 927-3:2007-03 as follows: a) Annex G (informative) “Precision data” has been added; b) the use of a multi-blade cutting tool for the cross-cut test is allowed (B.9.2.1); c) normative referenc
7、es have been updated; d) the standard has been editorially revised. Previous editions DIN EN 927-3: 2002-05, 2003-06, 2007-03 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 927-3 July 2012 ICS 87.040 Supersedes EN 927-3:2006English Version Paints and varnishes - Coating materials and coating s
8、ystems for exterior wood - Part 3: Natural weathering test Peintures et vernis - Produits de peinture et systmes de peinture pour bois en extrieur - Partie 3: Essais de vieillissement naturel Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme fr Holz im Auenbereich - Teil 3: Freibewi
9、tterung 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
10、 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
11、 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 Mac
12、edonia, 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 COMIT EUROPEN DE NORMALISATION EU
13、ROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 927-3:2012: EEN 927-3:2012 (E) 2 Contents Page Foreword 41 Scope 52 Normative references 53 Prin
14、ciple 64 Apparatus and materials .65 Sampling .66 Test panels .76.1 Wood .76.2 Preparation and selection of wood panels .86.3 Preparation of coated panels .86.3.1 Wood conditioning 86.3.2 Preparation of panels for the test coating 86.3.3 Preparation of panels for the Internal Comparison Product (ICP
15、) .86.3.4 Sealing and ageing 86.3.5 Thickness of the coating .97 Procedure 107.1 General . 107.2 Examination before exposure . 107.3 Exposure 107.4 Examination after exposure . 107.4.1 Examination on the exposure racks . 107.4.2 Laboratory examination of unwashed panels . 107.4.3 Laboratory examinat
16、ion of washed panels 118 Precision data . 119 Expression of results and test report . 11Annex A (normative) Internal Comparison Product (ICP) alkyd stain 12Annex B (normative) Details of test methods . 14B.1 Gloss and change of gloss 14B.2 Colour and colour change . 14B.3 Blistering . 14B.4 Flaking
17、. 14B.5 Mould growth 14B.6 Cracking . 15B.7 Chalking . 15B.8 General appearance . 15B.9 Adhesion 15B.9.1 General . 15B.9.2 Apparatus 15B.9.3 Procedure 15B.10 Test for abnormally porous wood . 16B.11 Test for heartwood in pine . 16Annex C (normative) Assessment requirements for panels of test coating
18、s and ICP . 17Annex D (informative) Suggested format for a test report . 18Annex E (informative) Optional tests including variations to standard weathering test procedure to obtain additional information on coating performance . 21DIN EN 927-3:2012-10EN 927-3:2012 (E) 3 E.1 Principle 21E.2 Tests on
19、alternative wood substrates . 21E.3 Tests with water trap . 21E.3.1 Apparatus and materials. 21E.3.2 Preparation . 22E.3.3 Panel assessment . 22E.4 Tests with back sealing of the panels . 23Annex F (informative) Explanatory notes . 24F.1 Natural weathering test . 24F.2 Validity of test reports . 24F
20、.2.1 System 24F.2.2 Climate and region 24Annex G (informative) Precision data . 25Bibliography 26DIN EN 927-3:2012-10EN 927-3:2012 (E) 4 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 Eu
21、ropean 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 e
22、lements 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 m
23、ulti-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 tes
24、t; 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 Euro
25、pean 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, Slo
26、venia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 927-3:2012-10EN 927-3:2012 (E) 5 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 me
27、ans 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
28、 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 varni
29、shes Cross-cut test (ISO 2409) EN ISO 2431, Paints and varnishes Determination of flow time by use of flow cups (ISO 2431) EN ISO 2808:2007, Paints and varnishes Determination of film thickness (ISO 2808:2007) EN ISO 2810, Paints and varnishes Natural weathering of coatings Exposure and assessment (
30、ISO 2810) EN ISO 2813, Paints and varnishes Determination of specular gloss of non-metallic paint films at 20, 60 and 85 (ISO 2813) EN ISO 4628-1:2003, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appea
31、rance Part 1: General introduction and designation system (ISO 4628-1:2003) EN ISO 4628-2, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 2: Assessment of degree of blistering (ISO 4628-2)
32、 EN ISO 4628-4, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 4: Assessment of degree of cracking (ISO 4628-4) EN ISO 4628-5, Paints and varnishes Evaluation of degradation of coatings De
33、signation of quantity and size of defects, and of intensity of uniform changes in appearance Part 5: Assessment of degree of flaking (ISO 4628-5) EN ISO 4628-6, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes
34、 in appearance Part 6: Assessment of degree of chalking by tape method (ISO 4628-6) EN ISO 11664-4, Colorimetry Part 4: CIE 1976 L*a*b* Colour space (ISO 11664-4) EN ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling (ISO 15528) ISO 554, Standard atmospheres for conditi
35、oning and/or testing Specifications DIN EN 927-3:2012-10EN 927-3:2012 (E) 6 3 Principle The resistance to natural weathering of the coating system under test, applied to a wood substrate, is assessed. Durability is evaluated by determining the changes in decorative and protective properties of coati
36、ngs after 12 months of exposure. The standard test substrate selected was Pinus sylvestris (European redwood or Scots pine, subsequently referred to as pine) in order to obtain relevant results more rapidly. The sapwood, which is usually present in joinery timber, was chosen for use instead of heart
37、wood because paint failure is more evident on the former. Differences in quality of wood, and in the weather and site conditions, are recognised and allowed for in the method by comparing the test with a reference system. The composition of the reference system (designated as “Internal Comparison Pr
38、oduct“ or “ICP“) is specified in Annex A. The standard test substrate is pine sapwood with the rear side of panels untreated. However, supplementary information on coating performance may be obtained by conducting optional tests on additional wood species, on pine modified or impregnated by industri
39、al processes, by using a pine panel containing a water trap in its exposed face, or by coating the rear side of the panels. Optional tests are described in Annex E. It is emphasised that they can serve only to provide additional information. 4 Apparatus and materials 4.1 Exposure racks, inclined at
40、an angle of 45 to the horizontal, on which the specimens are facing towards the equator in accordance with EN ISO 2810. 4.2 Glossmeter, for the measurement of specular gloss in accordance with EN ISO 2813, at 60 geometry. 4.3 Tristimulus colorimeter or spectrophotometer, for the measurement of colou
41、r and calculation of colour difference in CIELAB colour coordinates in accordance with EN ISO 11664-4. 4.4 Tape and cutting tool, for the assessment of adhesion in accordance with EN ISO 2409. 4.5 Microscope, with a magnification of 10 for the assessment of surface defects. 4.6 Microscope, for measu
42、rement of film thickness in accordance with ISO 2808:2007, method 6A. 4.7 Self-adhesive, transparent tape, in accordance with EN ISO 4628-6 for the assessment of chalking. 4.8 Climate chamber. 5 Sampling Take a representative sample of the product tested or of each product in the case of a multi-coa
43、t system, as described in EN ISO 15528. Examine and prepare each sample for testing as described in EN ISO 1513. DIN EN 927-3:2012-10EN 927-3:2012 (E) 7 6 Test panels 6.1 Wood The wood shall be pine that has been selected to be free from knots, cracks and resinous streaks and to be straight-grained
44、and of normal growth rate (i.e. 3 to 8 annual rings per 10 mm). The inclination of the growth rings to the face shall be 5 to 45(see Figure 1). The wood shall be free from blue stain and evidence of surface or bulk fungal infection. Abnormal porosity (caused by bacterial attack) shall be avoided (se
45、e Annex B, Clause B.10). The wood shall be conditioned at (20 2) C and a relative humidity of (65 5) % (in accordance with ISO 554) to an equilibrium moisture content of (13 2) %. a) b) c) d) Key a) Example of a panel with no heartwood (if present) closer than 10 mm to the test surface fulfilling th
46、e requirement for growth ring orientation (5 to 45) at the front side. b) This panel does not meet the specification because the heartwood is too close to the front side. c) This panel does not meet the specification because the growth ring orientation is not within the 5 to 45 band. The growth ring
47、s incline -10 at the left of the panel and 30 at the right. Consequently a part of the surface contains tangentially cut wood surface (growth ring inclination 0), with considerable risk of crack formation. d) This panel does not meet the specification because the growth ring orientation is not withi
48、n the 5 to 45 band. The growth rings incline 45 at the left of the panel and 70 at the right. NOTE The top side of panels is the exposed side; the bottom is the rear face. Figure 1 Cross section of panels DIN EN 927-3:2012-10EN 927-3:2012 (E) 8 6.2 Preparation and selection of wood panels The panels shall be cut from boards planed all round and
