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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | DRAFT FOR DEVELOPMENT DD ENV 927-2:2000 IC
2、S 87.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Paints and varnishes Coating materials and coating systems for exterior wood Part 2: Performance specification Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:04:14 GMT+00:00 2006
3、, Uncontrolled Copy, (c) BSI This Draft for Development, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 October 2000 BSI 10-2000 ISBN 0 580 36593 X DD ENV 927-2:200
4、0 Amendments issued since publication Amd. No.DateComments National foreword This Draft for Development is the official English language version of ENV 927-2:2000. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and
5、 is of a provisional nature because of the problem of comparing performance in different climatic regions. It should be applied on this provisional basis, so that information and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are
6、requested so that UK experience can be reported to the European organization responsible for its conversion into a European standard. A review of this publication will be initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of
7、its three-year life. The commencement of the reveiew period will be notified by an announcement in Update Standards. According to the replies recieved by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the
8、life of the prestandard or to withdraw it. Comments should be sent in writing to the Secretary of BSI Subcommittee STI/28/2, Coating systems for wood, at 389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of t
9、he text. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitle
10、d International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Summary of pages This document comprises a front cover, an inside front cover, the ENV title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright notice d
11、isplayed in this document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:04:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN PRESTANDARD PRNORME EUROPENNE EUROPISCHE VORNORM ENV 927-2 August 2000 ICS 87.040
12、English version Paints and varnishes - 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 extrieur - Partie 2: Spcifications de performance Lacke und Anstrichstoffe - Beschichtungs
13、stoffe und Beschichtungssysteme fr Holz im Auenbereich - Teil 2: Leistungsanforderungen This European Prestandard (ENV) was approved by CEN on 6 August 2000 as a prospective standard for provisional application. The period of validity of this ENV is limited initially to three years. After two years
14、the members of CEN will be requested to submit their comments, particularly on the question whether the ENV can be converted into a European Standard. CEN members are required to announce the existence of this ENV in the same way as for an EN and to make the ENV available promptly at national level
15、in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final decision about the possible conversion of the ENV into an EN is reached. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finl
16、and, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brusse
17、ls 2000 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. ENV 927-2:2000 E Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:04:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 DD ENV 927-2:2000
18、 Contents Page Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、 . . . . . . . . . . . . . . 2 1 Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Normative references. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、. . . . . . . . . . . . . . . . 2 3 Terms and definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 Performance tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、 . . . . . . . . . . . . . . . . 3 5 Optional tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6 Expression of results and interpretation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . . . . . . . 5 Annex A (informative) Application of weathering test criteria to some representative test results . . . . . . . . . . 7 Annex B (informative) Information and guidelines on interpretation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Bibliography . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Foreword This European Prestandard has been prepared by Technical Committee CEN/TC 139 “Paints and varnishes“, the secretariat of which is held by DIN. EN 927 co
24、nsists of the following parts under the general title: Paints and varnishes Coating systems for exterior wood Part 1:Classification and selection Part 2:Performance specification Part 3:Natural weathering test Part 4:Assessment of the water-vapour permeability Part 5:Assessment of liquid water perme
25、ability The annexes A and B are informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this European Prestandard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Irela
26、nd, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Introduction This is one of a number 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
27、 also provides a framework for communicating information on the suitability of a coating for particular specific end-use categories. Improved communication is beneficial in the removal of technical barriers to trade. However there remains the problem of comparing products tested, or likely to be exp
28、osed, in different climatic regions. ENV 927-2 addresses this latter issue and sets specific performance criteria. 1 Scope This part of EN 927 addresses performance criteria for coating systems on exterior wood. Performance requirements are specified according to the categories of end use and exposu
29、re conditions (defined in EN 927-1) in terms of the results of natural weathering performance testing carried out in accordance with EN 927-3:2000. A mandatory water permeability test in accordance with EN 927-5 : 2000 is also specified. Additional optional tests are identified which may be used by
30、suppliers to provide voluntary additional information, to a standardized format, on aspects of performance relevant to specific building components such as windows. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 06:04:14 GMT+00:00 2006, Uncontrolled Copy, (c) B
31、SI Page 3 DD ENV 927-2:2000 2 Normative references This European Prestandard incorporates, by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references,
32、subsequent amendments to or revisions of any of these publications apply to this European Prestandard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 152-1 1988 Test methods for wood pr
33、eservatives Laboratory method for determining the preventive effectiveness of a preservative treatment against blue stain in service Part 1: Brushing procedure EN 152-2 1988 Test methods for wood preservatives Laboratory method for determining the protective effectiveness of a preservative treatment
34、 against blue stain in service Part 2: Application by methods other than brushing EN 927-1 1996 Paints and varnishes Coating materials and coating systems for exterior wood Part 1: Classification and selection EN 927-3 2000 Paints and varnishes Coating materials and coating systems for exterior wood
35、 Part 3: Natural weathering test EN 927-5 2000 Paints and varnishes Coating materials and coating systems for exterior wood Part 5: Assessment of the liquid water permeability EN 971-1 1996 Paints and varnishes Terms and definitions for coating materials Part 1: General terms EN ISO 4618-2 Paints an
36、d varnishes Terms and definitions for coating materials Part 2: Special terms relating to paint characteristics and properties (ISO 4618-2 : 1999) EN ISO 4622 1994 Paints and varnishes Pressure test for stackability (ISO 4622:1992) 3 Terms and definitions For the purposes of this Prestandard, the de
37、finitions listed in EN 927-1, EN 971-1 and EN ISO 4618-2 apply. 4 Performance tests 4.1 Resistance to natural weathering 4.1.1 Principle The assessment of a coating material to this specification will require a natural weathering test to be carried out in accordance with EN 927-3:2000, using a flat
38、wood panel of pine (Pinus silvestris) with a planed surface. Coating systems meeting one or more of the performance profiles described below can claim conformity with the specification as described in Section 6. Coating systems not meeting the performance criteria cannot claim full conformity but ma
39、y offer 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 assessment to be made of the suitability of the system for the proposed end-use. Comparative trials have
40、 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 on the interpretation of the results is given in annex B. The severity of the exposure conditions
41、is determined by reference to the performance of an Internal Comparison Product (ICP), which also serves as a reference standard for the optional evaluation of mould resistance. 4.1.2 Performance criteria - Natural Weathering The scores for the assessment criteria, Blistering, Cracking, Flaking and
42、Adhesion (from EN 927-3:2000) and the Water Absorption Value (from EN 927-5 : 2000), are interpreted as meeting, or not meeting the required standard, relative to the end-use category, according to the criteria tabulated in Table 1. These rankings are relative to the exposure conditions as described
43、 in 4.1.3: Interpretation of criteria: (1) The first four values in each column each represents the maximum allowed for the arithmetic mean (to one decimal place) of the three replicates from the natural weathering test (EN 927-3:2000). Licensed Copy: London South Bank University, London South Bank
44、University, Tue Dec 12 06:04:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 DD ENV 927-2:2000 (2) The maximum sum value is the limit which must not be exceeded for the sum of the 12 (4 3) individual results. (3) The Maximum difference between highest and lowest score to qualify, refers to the
45、difference between the highest and lowest score in any of the individual test panels. If this figure is exceeded the test is declared invalid and must be repeated. (4) The Water Absorption Value is the maximum allowed for the arithmetic mean of the five replicates as determined by the procedure desc
46、ribed in EN 927-5 : 2000. (5) Coating systems not meeting any of these profiles cannot claim full conformity in any of the three end use categories. Examples of the application of these criteria to hypothetical test results are given in annex A. Table 1 - Limit values for performance criteria Natura
47、l weathering and water absorption StableSemi-stableNon-stable Blistering0,30,71 Cracking0,71,73 Flaking0,30,71,3 Adhesion0,71,72,7 Maximum sum value61218 Maximum difference to qualify as valid test 234 EN 927-5 : 2000 Water absorption value 175 g/m2 250 g/m2no limit NOTE Test precision An estimate o
48、f the standard deviation 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 var
49、iation in the performance 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 occurring, and rules out those which are well outside the expected distribution. 4.1.3 Exposure conditions If the internal comparison product (ICP see EN 927-3:2000) meets the weatheri