1、BSI Standards PublicationBS EN 927-2:2014Paints and varnishes Coatingmaterials and coating systemsfor exterior woodPart 2: Performance specificationBS EN 927-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 927-2:2014. Itsupersedes BS EN 927-2:2006 which i
2、s withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/28, Paint systems for non-metallic substrates.A list of organizations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 beobtained on request to its secretary.This publication does not purport to include all the necessarypro
3、visions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 81250 7ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published u
4、nder the authority of theStandards Policy and Strategy Committee on 30 September 2014.Amendments issued since publicationDate Text affectedBS EN 927-2:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 927-2 September 2014 ICS 87.040 Supersedes EN 927-2:2006English Version Paints and varnishes
5、 - Coating materials and coating systems for exterior wood - Part 2: Performance specification Peintures et vernis - Produits de peinture et systmes de peinture pour le bois en extrieur - Partie 2: Spcifications de performance Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme fr Hol
6、z im Auenbereich - Teil 2: Leistungsanforderungen This European Standard was approved by CEN on 25 July 2014. 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 alter
7、ation. Up-to-date lists and bibliographical 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
8、 by translation under the responsibility of 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, Estoni
9、a, Finland, Former Yugoslav Republic of Macedonia, 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 STANDA
10、RDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 927-2:2014 EBS EN 927-2:2014EN 927-2:2014
11、 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 Performance tests Testing profiles.6 5 Test overview .7 5.1 Natural weathering.7 5.1.1 General 7 5.1.2 Performance criteria 7 5.1.3 Exposure conditions .8 5.1.4 Natural weathering Alternat
12、ive substrates 8 5.1.5 Natural weathering Alternative test piece 8 5.2 Existing test methods .8 5.2.1 Water permeability .8 5.2.2 Artificial weathering 9 5.2.3 Knot staining 9 5.2.4 Tannin staining 9 5.2.5 Microfoam .9 5.2.6 Film extensibility 9 5.2.7 Blocking 9 5.2.8 Impact test 9 5.2.9 Fungal and
13、algal growth 10 5.3 Test methods in preparation . 10 5.3.1 Wet adhesion (parallel cross-cut test) 10 5.3.2 Wet adhesion (pull-off test) . 10 5.3.3 UV transmittance 10 5.3.4 End grain sealing 10 6 Summary of test methods and reporting convention . 10 7 Expression of results and claiming conformity Sc
14、ope and reporting convention . 11 Bibliography . 13 BS EN 927-2:2014EN 927-2:2014 (E) 3 Foreword This document (EN 927-2:2014) 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 na
15、tional standard, either by publication of an identical text or by endorsement, at the latest by March 2015, and conflicting national standards shall be withdrawn at the latest by March 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
16、 rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 927-2:2006. The following significant technical changes have been made with respect to EN 927-2:2006: a) test profiles for the three main end-use categories (as define
17、d in EN 927-1) have been updated to include additional test methods; b) Annex A has been deleted; further information on test methods is found in Clause 5, or the referenced test methods themselves. EN 927 consists of the following parts under the general title: Paints and varnishes Coating material
18、s 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. Acco
19、rding to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany
20、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 927-2:2014EN 927-2:2014 (E) 4 Introduction This European Standard is one of a number
21、of parts of EN 927. EN 927-1 addresses the issue of terminology for the wide variety of exterior coatings for wood that are now available. EN 927-1 also provides a framework for communicating information on the suitability of a coating for particular specific end-use categories. Improved communicati
22、on 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, and the relevance of tests for different categories of end-use. EN 927-2 addresses these issues and sets a limited
23、number of mandatory performance criteria combined with optional tests that can provide additional information to a standardized format. BS EN 927-2:2014EN 927-2:2014 (E) 5 1 Scope This part of EN 927 addresses performance criteria for coating systems on exterior wood. Performance requirements are sp
24、ecified according to three categories of end use (defined in EN 927-1) in terms of two mandatory tests namely natural weathering performance testing carried out in accordance with EN 927-3, and water permeability in accordance with EN 927-5. Additional optional tests (non-mandatory) are tabled which
25、 may be used by suppliers, or for specification purposes, to provide additional information, to a standardized format, on aspects of performance relevant to specific situations. The majority of test methods are drawn from EN 927 (all parts), but where relevant additional tests from other national an
26、d international sources are used. Requirements for claiming conformity with EN 927-2 are defined and provide flexibility for different situations and can also provide a basis for certification. 2 Normative references The following documents, in whole or in part, are normatively referenced in this do
27、cument and are indispensable 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 927-1:2013, Paints and varnishes - Coating materials and coating systems for exterior w
28、ood - Part 1: Classification and selection EN 927-3:2012, 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
29、 permeability EN 927-6, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 6: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water EN 16492, Paints and varnishes - Evaluation of the surface disfigurement caused by fungi and algae
30、on coatings CEN/TS 16358, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of air inclusions/microfoam in coating films CEN/TS 16359, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of knot staining resistance of
31、wood coatings CEN/TS 16360, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of film extensibility by indentation of a coating on a wooden substrate CEN/TS 16498, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of
32、 tannin staining CEN/TS 16499, Paints and varnishes - Coating materials and coating systems for exterior wood - Resistance to blocking of paints and varnishes on wood CEN/TS 16700, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of resistance to impact of
33、a coating on a wooden substrate EN ISO 4618:2006, Paints and varnishes - Terms and definitions (ISO 4618:2006) BS EN 927-2:2014EN 927-2:2014 (E) 6 EN ISO 4628-1, Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform ch
34、anges in appearance - Part 1: General introduction and designation system (ISO 4628-1) EN ISO 7783, Paints and varnishes - Determination of water-vapour transmission properties - Cup method (ISO 7783) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 92
35、7-1:2013 and EN ISO 4618:2006 apply. 4 Performance tests Testing profiles EN 927-1 classifies exterior wood coatings according to appearance (75 possibilities) and three broad end-use categories. Assessment of performance is carried out with reference to the end-use categories, which are grouped acc
36、ording to the extent to which wood movement shall be controlled. Performance will be strongly influenced by appearance (e.g. transparent versus opaque), by substrate (e.g. wood species) and by climatic and exposure conditions. It is open to suppliers or end-users to agree a combination of tests (see
37、 Table 1 and Table 2) that suit particular situations provided that testing is carried out according to the principles described in this European Standard and includes the specified mandatory tests. Requirements for claiming conformity are described in Clause 7. When optional tests are carried out,
38、they shall be reported according to the format described in this European Standard. Table 1 Test methods Property Test method (current ref.) End-use category (see EN 927-1) Stable Semi-stable Non-stable Basic classification EN 927-1 Mandatory Mandatory Mandatory Natural weathering on pine EN 927-3 M
39、andatory Mandatory Mandatory Natural weathering on alternative substrates EN 927-3 Optional Optional Optional Natural weathering on alternative test piece EN 927-3 Optional Optional Optional Water-vapour transmission properties EN ISO 7783 Optional Optional Optional Water absorption EN 927-5 Mandato
40、ry Mandatory Mandatory Artificial weathering EN 927-6 Optional Optional Optional Knot staining CEN/TS 16359 Optional Optional Optional Tannin staining CEN/TS 16498 Optional Optional Optional Microfoam CEN/TS 16358 Optional aOptional Optional Film extensibility CEN/TS 16360 Optional Optional Optional
41、 Blocking test CEN/TS 16499 Optional Optional Optional Impact resistance CEN/TS 16700 Optional Optional Optional Fungal and algae growth EN 16492 Optional Optional Optional aMandatory only for spray applications. BS EN 927-2:2014EN 927-2:2014 (E) 7 Table 2 Test methods in preparation Property Test m
42、ethod aEnd-use category (see EN 927-1) Stable Semi-stable Non-stable Wet adhesion (parallel cross-cut) Optional Optional Optional Wet adhesion (pull) Optional Optional Optional UV transmittance and transparency Optional Optional Optional End grain sealing Optional Optional Optional aCurrently under
43、development. 5 Test overview 5.1 Natural weathering 5.1.1 General The assessment of a coating material to this European Standard will require a natural weathering test to be carried out in accordance with EN 927-3, using a flat wood panel of pine (Pinus sylvestris) with a planed surface. A manufactu
44、rer of a coating system that meets one or more of the performance criteria described in 5.1.2 can use this information as part of a claim to conformity with the specification, as described in Clause 7. The external durability of the coating system under test is assessed by a number of performance cr
45、iteria. 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 in 5.1.2 sets a repeatable and reproducible performance standard. 5.1.2 Performance criteria The scores for the asses
46、sment criteria, blistering, cracking, flaking and adhesion in according to EN 927-3 are interpreted as meeting, or not meeting the required standard, relative to the end-use category, according to the criteria given in Table 3. These rankings are relative to the exposure test site and care should be
47、 taken not to transfer the results uncritically to other geographical areas. 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 in according to
48、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
49、 the test is declared invalid and shall be repeated; 4) if a coating system exceeds the maximum sum value, or maximum difference for any end-use category then the manufacturer may not claim conformity for that category. BS EN 927-2:2014EN 927-2:2014 (E) 8 Table 3 Limit values for performance criteria Natural weathering 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 NOTE Test precision: An estimate of the
