1、BRITISH STANDARD BS EN 314-2:1993 Plywood Bondingquality Part 2: Requirements The European Standard EN 314-2:1993 has the status of a British Standard UDC 674.03-419.3:621.792:620.176BSEN314-2:1993 This British Standard, having been prepared under the directionof the Technical SectorBoard for Buildi
2、ng andCivil Engineering (B/-), waspublished under the authorityof the Standards Boardand comes into effect on 15April1993 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 90/15588 DC ISBN 0 580 21036 7 Cooperating organizations
3、 The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiserings
4、raad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Ital
5、iano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzer
6、land Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN314-2:1993 BSI 09-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 314-2 3 National annex NA
7、 (informative) Committees responsible Inside back cover National annex NB (informative) Cross-reference Inside back coverBSEN314-2:1993 ii BSI 09-1999 National foreword This British Standard has been prepared under the direction of the Technical Sector Board for Building and Civil Engineering and is
8、 the English language version of EN314-2:1993 Plywood Bonding quality Part 2: Requirements, published by the European Committee for Standardization (CEN). EN 314-2 was produced as a result of international discussion in which the UK took an active part. EN 314-2 supersedes clauses1, 2 and3 of BS6566
9、-8:1985 Plywood Part8 Specification for bond performance of veneer plywood, which will be withdrawn in due course. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Br
10、itish Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may h
11、ave had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 314-2 February 1993 UDC 674.03-419.3:621.792:620.176 Descriptors: Wooden boards, plywood, gluing, quality, specifications, classification, she
12、ar strength English version Plywood Bonding quality Part 2: Requirements Contreplaqu Qualit du collage Partie 2: Exigences Sperrholz Qualitt der Verklebung Teil 2: Anforderungen This European Standard was approved by CEN on1992-12-15. CEN members are bound to comply with the CEN/CENELEC Internal Reg
13、ulations 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 obtained on application to the Central Secretariat or to any CEN member. This
14、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 Secretariat has the same status as the official versions. CEN members are the
15、national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr
16、 Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 314-2:1993 EEN314-2:1993 BSI 09-1999 2 Foreword This European Standard was prepared by Working Group2 “Plywood” (Secretariat: France) of Technical Committee CEN/TC112 “Wood-based pane
17、ls” (Secretariat: Germany). This standard is one of a series of standards specifying requirements and test methods for plywood. No existing European Standard is superseded. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endor
18、sement, at the latest by August1993, and conflicting national standards shall be withdrawn at the latest by December1994. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, German
19、y, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Bonding classes 3 4 Requirements 3 5 Determination of the bonding class 3 Annex A (informative) Bibliography 5 Figur
20、e 1 Relationship between the meanpercentage of apparent cohesive woodfailureand the mean shear strength 4 Table 1 Pretreatments for the three bondingclasses 3 Table 2 Requirements 3EN 314-2:1993 BSI 09-1999 3 1 Scope This European Standard specifies requirements for bonding classes of veneer plywood
21、 according to their end uses. The appropriate test methods are specified in EN314-1. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the public
22、ations are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard, only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 636-1, Pl
23、ywood Specifications Part1:Requirements for plywood for use in dry conditions 1) . EN 636-2, Plywood Specifications Part2:Requirements for plywood for use in humid conditions 1) . EN 636-3, Plywood Specifications Part3:Requirements for plywood for use in exterior conditions 1) . EN 314-1, Plywood Bo
24、nding quality Part 1: Test methods. 3 Bonding classes Bonding quality is divided into three classes, according to EN636-1, EN636-2 and EN636-3, based upon moisture resistance as follows. Class 1: dry conditions This bonding class is appropriate for normal interior climate. Class 2: humid conditions
25、This bonding class is appropriate for protected external applications (e.g.behind cladding or under roof coverings), but is capable of resisting weather exposure for short periods (e.g.when exposed during the construction). It is also suitable for interior situations where the service moisture condi
26、tion is raised above the class1 level. Class 3: exterior conditions This bonding class is designed for exposure to weather over sustained periods. NOTEThe durability of plywood depends not only upon the bonding performance level, but also upon other factors. 4 Requirements For each pretreatment both
27、 the mean shear strength and the mean apparent cohesive wood failure for a minimum of10 test pieces per glueline, shall satisfy the criteria given inTable 2 for all three bonding classes. The pretreatments are related to the bonding classes as given inTable 1. Each pretreatment is carried out on a s
28、eparate set of ten pieces for each glueline. Table 1 Pretreatments for the three bondingclasses For all three bonding classes, each glueline shall satisfy two criteria: the mean shear strength and the mean apparent cohesive wood failure, as combined in the following table. Table 2 Requirements The r
29、elationship between the mean percentage of apparent cohesive wood failure and the mean shear strength given inTable 2 is illustrated inTable 1. 5 Determination of the bonding class The comparison of results obtained according to EN314-1 and requirements defined in this Standard, allows determination
30、 of the bonding class to which the tested panel belongs. 1) At present at the draft stage. Pretreatments (according to EN 314-1) 5.1.1 5.1.2 5.1.3 a 5.1.4 Class 1: dry interior X Class 2: covered exterior X X Class 3: non coveredexterior X X X a When full phenolic glues are used, pretreatment5.1.3 c
31、an be used provided pretreatment5.1.4 is occasionally used as a test of confirmation. Mean shear strength f v Mean apparent cohesive wood failure w N/mm 2 % 0,2k f v 0,4 U 80 0,4k f v 0,6 U 60 0,6k f v 1,0 U 40 1,0k f v no requirementEN 314-2:1993 4 BSI 09-1999 Figure 1 Relationship between the mean
32、 percentage of apparent cohesive wood failureandthe mean shear strengthEN 314-2:1993 BSI 09-1999 5 Annex A (informative) Bibliography EN 313-1, Plywood Classification and terminology Part 1: Classification. EN 313-2, Plywood Classification and terminology Part 2: Terminology.6 blankBSEN314-2:1993 BS
33、I 09-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Technical Sector Board for Building and Civil Engineering (B/-) to Technical Committee B/541, upon which the following bodies were repre
34、sented: American Plywood Association Association of British Plywood and Veneer Manufacturers British Woodworking Federation Chartered Institute of Building Co-ordinator for Timber and Timber Products Council of the Forest Industries of British Columbia Department of the Environment (Construction Dir
35、ectorate) Fibre Building Board Organisation (FIDOR) Finnish Plywood International Flat Roofing Contractors Advisory Board Forestry Commission Furniture Industry Research Association Institution of Structural Engineers National Federation of Roofing Contractors National House-building Council Nationa
36、l Panel Products Association Royal Institute of British Architects Timber Research and Development Association Timber Trade Federation United Kingdom and Ireland Particleboard Association Coopted member National annex NB (informative) Cross-reference Publication referred to Corresponding British Sta
37、ndard EN 314-1:1993 BS EN 314 Plywood Bonding quality Part 1:1993 Test methodsBS EN 314-2: 1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and
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