BS EN 927-6-2006 Paints and varnishes - Coating materials and coating systems for exterior wood - Part 6 Exposure of wood coatings to artificial weathering using fluorescent UV lam.pdf

1、BS EN 927-6:2006ICS 87.040NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPaints and varnishes Coating materialsand coating systems forexterior woodPart 6: Exposure of wood coatings toartificial weathering using fluorescentUV lamps and waterLicensed Copy: Wang B

2、in, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 October2008 BSI 2008ISBN 978 0 580 55269 4Amendments/corrigenda issued since publicationDate CommentsBS EN 927-6:2006

3、National forewordThis British Standard is the UK implementation of .The UK participation in its preparation was entrusted to TechnicalCommittee STI/28, Paint systems for non-metallic substrates.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publ

4、ication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy,

5、 (c) BSIBS EN 927-6:2006EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 927-6August 2006ICS 87.040English VersionPaints and varnishes - Coating materials and coating systemsfor exterior wood - Part 6: Exposure of wood coatings to artificialweathering using fluorescent UV lamps and waterPeintures e

6、t vernis - Produits de peinture et systmes depeinture pour bois en extrieur - Partie 6 : Vieillissementartificiel des revtements pour bois par exposition deslampes UV fluorescentes et de leauBeschichtungsstoffe - Beschichtungsstoffe undBeschichtungssysteme fr Holz im Auenbereich - Teil 6:Knstliche B

7、ewitterung von Holzbeschichtungen mitfluoreszierenden UV-Lampen und WasserThis European Standard was approved by CEN on 26 June 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 stan

8、dard 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 lan

9、guage 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,Ger

10、many, 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGMan

11、agement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 927-6:2006: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN 927-6:2006

12、EN 927-6:2006 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Principle5 4 Apparatus .6 4.1 Test chamber6 4.2 Lamps .6 4.3 Device for wetting the test panels6 4.4 Black panel thermometer7 4.5 Irradiance control.7 5 Test panels .7 5.1 Wood .7 5.2 Preparation and sel

13、ection of wood panels .8 5.3 Preparation of coated panels .8 6 Procedure .9 6.1 Examination before exposure 9 6.2 Mounting the test panels 9 6.3 Exposure.9 6.4 Examination of test panels .10 7 Precision.11 8 Expression of results and test report11 Annex A (normative) Details of test methods12 A.1 Gl

14、oss and change of gloss .12 A.2 Colour and colour change 12 A.3 Blistering 12 A.4 Flaking 12 A.5 Cracking12 A.6 Chalking12 A.7 General appearance 13 A.8 Adhesion.13 A.8.1 General13 A.8.2 Apparatus and material.13 A.8.3 Procedure .13 Annex B (informative) Explanatory notes 14 B.1 Explanation of expos

15、ure cycle.14 B.2 Reproducibility.14 B.3 Correlation to natural weathering 14 B.4 Dependency on wood species and substrate.14 B.5 Recommendation of periodical performance assessments .14 Annex C (informative) Test for heartwood in pine .15 Annex D (informative) Water treatment, devices for water puri

16、fication16 Annex E (normative) Test for abnormally porous wood.17 Annex F (informative) Alternative procedure for preparation and coating of panels .18 Bibliography 19 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN 927-6:2006EN 927-6:2006 (E)

17、 3 Foreword This document (EN 927-6:2006) 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

18、 latest by February 2007, and conflicting national standards shall be withdrawn at the latest by February 2007. 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:

19、 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 organizations o

20、f 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, Slo

21、venia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN 927-6:2006EN 927-6:2006 (E) 4 Introduction Coatings from paints, varnishes and similar materials are weathered in a laboratory in order to si

22、mulate ageing processes which occur from natural weathering. Generally, a valid correlation between ageing during artificial and natural weathering cannot be expected due to a large number of influencing factors. Certain relationships can only be expected if the effect of the important parameters (s

23、pectral distribution of the irradiance in the photochemically relevant range, temperature of the specimen, type of wetting, wetting cycle relative humidity) on the coating is known. However, unlike natural weathering, testing in the laboratory is carried out taking into consideration a limited numbe

24、r of variables which can be controlled and therefore the results are more reproducible. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN 927-6:2006EN 927-6:2006 (E) 5 1 Scope This part of EN 927 specifies a method for determining the resistance

25、 of wood coatings to artificial weathering performed in an apparatus equipped with fluorescent UV lamps, condensation and water spray devices. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cite

26、d applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 927-1, Paints and varnishes Coating materials and coating systems for exterior wood Part 1: Classification and selection EN ISO 2409, Paints and varnishes Cross-cut test (ISO 2409:

27、1992) EN ISO 2808, Paints and varnishes Determination of film thickness (ISO 2808:1997) EN ISO 2813, Paints and varnishes Determination of specular gloss of non-metallic paint films at 20, 60 and 85 (ISO 2813:1994, including Technical Corrigendum 1:1997) EN ISO 4628-1:2003, Paints and varnishes Eval

28、uation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance 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

29、 size of defects, and of intensity of uniform changes in appearance Part 2: Assessment of degree of blistering (ISO 4628-2:2003) 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 Pa

30、rt 4: Assessment of degree of cracking (ISO 4628-4:2003) EN ISO 4628-5, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 5: Assessment of degree of flaking (ISO 4628-5:2003) EN ISO 4628-6, P

31、aints and varnishes Evaluation of degradation of paint coatings Designation of intensity, quantity and size of common types of defect - Part 6: Rating of degree of chalking by tape method (ISO 4628-6:1990) prEN ISO 11507:2005, Paints and varnishes Exposure of coatings to artificial weathering Exposu

32、re to fluorescent UV and water (ISO/DIS 11507:2005) ISO 554, Standard atmospheres for conditioning and/or testing Specifications ISO 7724-1, Paints and varnishes Colorimetry Part 1: Principles ISO 7724-2, Paints and varnishes Colorimetry Part 2: Colour measurement 3 Principle Artificial weathering o

33、f coatings using fluorescent UV lamps, condensation or water spray is carried out in order to produce a certain radiant exposure or mutually agreed total number of operation hours, based on a given degree of a change in a property or properties. The properties of the exposed coatings are compared wi

34、th those of unexposed coatings, which are prepared from the same coating materials under identical conditions or with coatings whose degradation properties are known. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN 927-6:2006EN 927-6:2006 (E)

35、6 Radiation, temperature and humidity all contribute to the ageing process. Therefore, the apparatus specified in this standard simulates all three factors. The results obtained by this method do not necessarily directly relate to the results obtained under natural exposure conditions. The relations

36、hip between these results needs to be established before the method can be used to predict performance. The standard test substrate is pine sapwood with the back side of panels coated. However, supplementary information on coating performance may be obtained by conducting optional tests on additiona

37、l wood species, on pine, modified or impregnated by industrial processes or without coating the back side of the panels. 4 Apparatus 4.1 Test chamber The test chamber consists of an enclosure made from corrosion-resistant material which houses the lamps, a heated water tray, spray nozzles and test p

38、anel racks. 4.2 Lamps A UV lamp emits UV light from a low pressure mercury arc. The required spectral distribution is achieved by careful selection of the type of phosphor coating on the inner surface of the lamp and the nature of the glass used in the construction of the tubes. The lamp shall be of

39、 the following type: Lamp, commonly called UV-A 340, with a peak emission at 340 nm and the following relative spectral irradiance (see prEN ISO 11507:2005, lamp type 2): Table 1 Relative spectral irradiance of lamp Wavelength nm Relative spectral irradiancea % 290 2 mS/m) and therefore the time to

40、renew the water. Weekly exchange of the water has been found sufficient. Distilled water from heating systems can be used provided the plumbing can be shown not to contaminate the water. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN 927-6:20

41、06EN 927-6:2006 (E) 17 Annex E (normative) Test for abnormally porous wood Abnormally porous wood may be detected qualitatively by the rapid absorption of a drop of propan-2-ol (isopropanol) applied to a small surface; the drop should not be absorbed in less than 30 s by normal wood. The test should

42、 be carried out at not less than six places, widely separated on the test panel. Carry out the test on the backside of the panel. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN 927-6:2006EN 927-6:2006 (E) 18 Annex F (informative) Alternative

43、procedure for preparation and coating of panels An alternative preparation of test panels may be used, e.g. for industrially applied coating systems. In this case prepare larger panels first, plane their surfaces, apply and dry the coating system (including conditioning), cut the final panel size (s

44、ee 5.2) and seal the end grain and edges of the panel with at least two coats of the product under test or a flexible, moisture-impermeable paint, for example of long-oil alkyd type. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN 927-6:2006EN

45、 927-6:2006 (E) 19 Bibliography 1 EN 927-3, Paints and varnishes Coating materials and coating systems for exterior wood Part 3: Natural weathering test 2 EN ISO 2810, Paints and varnishes Natural weathering of coatings - Exposure and assessment (ISO 2810:2004) 3 EN ISO 4892-1, Plastics Methods of e

46、xposure to laboratory light sources Part 1: General guidance (ISO 4892-1:1999) 4 EN ISO 4892-3, Plastics Methods of exposure to laboratory light sources Part 3: Fluorescent UV lamps (ISO 4892-3:2006) 5 ASTM G151, Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that U

47、se Laboratory Light Sources 6 ASTM G154, Standard Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 13/01/2009 08:05, Uncontrolled Copy, (c) BSIBS EN927-6:2006BSI GroupHeadquarters 389Chiswick High Road,

48、London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at theinternational level. It is incorporated by Royal Charter.RevisionsBrit

49、ish Standards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments oreditions.It is the constant aim of BSI to improve the quality of our products and services.We would be grateful if anyone finding an inaccuracy or ambiguity while usingthis British Standard would inform the Secretary of the technical committeeresponsible, the identity of which can be found on the inside front co