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1、BRITISH STANDARDBS EN 927-2:2006Licensed copy: The University of Hong Kong, The University of Hong Kong, Version correct as of 25/03/2009 09:08, (c)BSIPaints and varnishes Coating materials and coating systems for exterior woodPart 2: Performance specificationICS 87.040NO COPYING WITHOUT BSI PERMISS
2、ION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 927-2:2006National forewordThis British Standard is the UK implementation of . It supersedesDDENV927-2:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/28, Paint systems for non-metallic substrates.A
3、 list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from l
4、egal obligations.Licensed copy: The University of Hong Kong, The University of Hong Kong, Version correct as of 25/03/2009 09:08, (c)BSIThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October2008 BSI 2008ISBN 978 0 580 56014 9Amendments/co
5、rrigenda issued since publicationDate CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORMEN 927-2April 2006BS EN 927-2:2006ICS 87.040Supersedes ENV 927-2:2000English VersionPaints and varnishes - Coating materials and coating systems for exterior wood - Part 2: Performance specificationPeintur
6、es et vernis - Produits de peinture et systmes de revtement pour le bois en extrieur - Partie 2: Spcifications de performanceBeschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme fr Holz im Auenbereich - Teil 2: LeistungsanforderungenThis European Standard was approved by CEN on 9 March
7、 2006.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 obtaine
8、d 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretar
9、iat has the same status as the official versions.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, Portuga
10、l, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION C OM I T EUR OP EN DE NOR M AL I S ATI ON EUR OP I S C HES KOM I TEE F R NOR M UNG Management Centre: rue de Stassart, 36 B-1050 BrusselsLicensed copy: The University of Hong Kong, Th
11、e University of Hong Kong, Version correct as of 25/03/2009 09:08, (c)BSI 2006 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN 927-2:2006: EEN 927-2:2006 (E)BSILicensed copy: The University of Hong Kong, The University of Hong Kong,
12、Version correct as of 25/03/2009 09Contents pageForeword .31Scope .52Normative references .53Terms and definitions .54Performance tests.55Optional tests .76Expression of results and interpretation .7Annex A (informative) Information and guidelines on interpretation .10Bibliography.1413BSILicensed co
13、py: The University of Hong Kong, The University of Hong Kong, Version correct as of 25/03/2009 09ForewordThis 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 th
14、e 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 un
15、der 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 artifici
16、al weathering using fluorescent UV lamps and waterThis 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
17、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,
18、Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.BSILicensed copy: The University of Hong Kong, The University of Hong Kong, Version correct as of 25/03/2009 09IntroductionThis is one of a n
19、umber 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. Imp
20、roved 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.BSILicensed copy: The U
21、niversity of Hong Kong, The University of Hong Kong, Version correct as of 25/03/2009 091 ScopeThis 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 i
22、n 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 addit
23、ional information, to a standardized format, on aspects of performance relevant to specific building components such as windows.2 Normative referencesThe following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited appli
24、es. 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 selectionEN 927-3:2000, Paints and varnishes Coating materials and coati
25、ng systems for exterior wood Part 3: Natural weathering testEN 927-5, Paints and varnishes Coating materials and coating systems for exterior wood Part 5: Assessment of the liquid water permeabilityprEN ISO 4618:2004, Paints and varnishes Terms and definitions (ISO/DIS 4618:2004)3 Terms and definiti
26、onsFor the purposes of this European Standard, the terms and definitions given in EN 927-1:1996 and prEN ISO 4618:2004 apply.4 Performance tests4.1 Resistance to natural weathering4.1.1GeneralThe assessment of a coating material to this specification will require a natural weathering test to be carr
27、ied 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 sy
28、stem 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 asses
29、sment 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
30、 on the interpretation of the results is given in Annex A.BSILicensed copy: The University of Hong Kong, The University of Hong Kong, Version correct as of 25/03/2009 09The severity of the exposure conditions is determined by reference to the performance of an Internal Comparison Product (ICP), whic
31、h also serves as a reference standard for the optional evaluation of mould resistance.4.1.2Performance criteriaThe 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
32、 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
33、 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
34、 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) I
35、f 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 absorptionStableSemi-stableNon-stableBlistering0,30,71Cracking0,71,73Flaking0,30,71
36、,3Adhesion111Maximum sum value71219Maximum difference to qualify as valid test234EN 927-5, water absorption value175 g/m2 a 250 g/m2 ano limita Non-mandatory values which will be revised/ratified in the light of ongoing work in CEN/TC 139/WG 2.NOTETest precisionAn estimate of the standard deviation
37、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
38、 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 o
39、ccurring, and rules out those which are well outside the expected distribution.BSILicensed copy: The University of Hong Kong, The University of Hong Kong, Version correct as of 25/03/2009 094.1.3Exposure conditionsIf the internal comparison product (ICP see EN 927-3) meets the weathering criteria fo
40、r the stable end-use category the exposure conditions are rated as medium. If it does not meet these criteria the conditions are ratedsevere (see EN 927-1).Exposure conditions during the test are recorded in the Expression of results (Clause 6).4.1.4Water permeabilityWater permeability shall be asse
41、ssed 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 testsThe test methods listed in Table 2 are recommended where additional information is required from the supplier of the coating system to meet specific
42、 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 testsTest descriptionTest methodBlister box testanytestmethodcanbeagreed,e.g. BS 7956:2000, Annex CBlockingany test method can be agreedStackabilityEN ISO 4622Compatibility with glazing (sealing) compounds and profilesOvercoat following suppliers recommendationsBlue stain in serviceEN