EN 927-6-2006 en 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

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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 waterThis British Standard

2、was published under theauthority of the StandardsPolicy and StrategyCommittee on 31 October2008 BSI 2008ISBN 978 0 580 55269 4Amendments/corrigenda issued since publicationDate CommentsBS EN 927-6:2006National forewordThis British Standard is the UK implementation of .The UK participation in its pre

3、paration 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 publication does not purport to include all the necessary provisionsof a contract. Users are responsibl

4、e for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 927-6:2006EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 927-6August 2006ICS 87.040English VersionPaints and varnishes - Coating materials and coating systemsfor exterior wood - Par

5、t 6: Exposure of wood coatings to artificialweathering using fluorescent UV lamps and waterPeintures et 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 leauBeschic

6、htungsstoffe - Beschichtungsstoffe undBeschichtungssysteme fr Holz im Auenbereich - Teil 6:Knstliche Bewitterung 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 Reg

7、ulations 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 Eur

8、opean 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 nation

9、al 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

10、.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement 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: EBS EN 927-6:2

11、006EN 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

12、selection 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

13、 Gloss 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 ex

14、posure 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 p

15、urification16 Annex E (normative) Test for abnormally porous wood.17 Annex F (informative) Alternative procedure for preparation and coating of panels .18 Bibliography 19 BS EN 927-6:2006EN 927-6:2006 (E) 3 Foreword This document (EN 927-6:2006) has been prepared by Technical Committee CEN/TC 139 “P

16、aints 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 February 2007, and conflicting national standards shall be withdrawn at the latest by

17、 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: Performance specification; Part 3: Natural weathering test; Part 5: Assessment of the liquid wa

18、ter 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 of the following countries are bound to implement this European Standard: Austria, Belgium, Cypru

19、s, 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. BS EN 927-6:2006EN 927-6:2006 (E) 4 Introd

20、uction Coatings from paints, varnishes and similar materials are weathered in a laboratory in order to simulate 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 inf

21、luencing factors. Certain relationships can only be expected if the effect of the important parameters (spectral 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, unli

22、ke natural weathering, testing in the laboratory is carried out taking into consideration a limited number of variables which can be controlled and therefore the results are more reproducible. BS EN 927-6:2006EN 927-6:2006 (E) 5 1 Scope This part of EN 927 specifies a method for determining the resi

23、stance 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 editio

24、n cited 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

25、 2409:1992) 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 varnishe

26、s Evaluation 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 quanti

27、ty and 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 appeara

28、nce Part 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 462

29、8-6, Paints 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

30、Exposure 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 weathe

31、ring of 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 compa

32、red with those of unexposed coatings, which are prepared from the same coating materials under identical conditions or with coatings whose degradation properties are known. BS EN 927-6:2006EN 927-6:2006 (E) 6 Radiation, temperature and humidity all contribute to the ageing process. Therefore, the ap

33、paratus 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 relationship between these results needs to be established before the method can be used to predict pe

34、rformance. 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 additional wood species, on pine, modified or impregnated by industrial processes or without coating t

35、he 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 panel racks. 4.2 Lamps A UV lamp emits UV light from a low pressure mercury arc. The required

36、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 the following type: Lamp, commonly called UV-A 340, with a peak emission at 340 nm and the f

37、ollowing 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 renew the water. Weekly exchange of the water has been found sufficient. Distilled water from

38、 heating systems can be used provided the plumbing can be shown not to contaminate the water. BS EN 927-6:2006EN 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) a

39、pplied to a small surface; the drop should not be absorbed in less than 30 s by normal wood. The test should 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. BS EN 927-6:2006EN 927-6:2006 (E) 18 Annex F (informative) Alt

40、ernative 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 pane

41、l size (see 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. BS EN 927-6:2006EN 927-6:2006 (E) 19 Bibliography 1 EN 927-3, Paints and varnishes Coating materials and coa

42、ting 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 exposure to laboratory light sources Part 1: General guidance (ISO 4892-1:1999) 4 EN ISO 48

43、92-3, 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 Use Laboratory Light Sources 6 ASTM G154, Standard Practice for Operating Fluorescent Light

44、 Apparatus for UV Exposure of Nonmetallic Materials BS EN927-6:2006BSI GroupHeadquarters 389Chiswick High Road,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

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