1、BRITISH STANDARD BS EN 635-2:1995 Incorporating Amendment No. 1 Plywood Classification by surface appearance Part 2: Hardwood The European Standard EN 635-2:1995 has the status of a British Standard ICS 79.060.10BSEN635-2:1995 This British Standard, having been prepared under the directionof the Sec
2、tor Board for Building and Civil Engineering, was published under the authorityof the Standards Board and comes into effect on 15 December 1995 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 92/114811 DC ISBN 0 580 24769 4 Co
3、mmittees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/541, Wood based panels, upon which the following bodies were represented: APA/Engineered Wood Association Association of British Plywood and Veneer Manufacturers British Woo
4、dworking Federation Council of the Forest Industries of British Columbia Department of the Environment (Building Research Establishment) Finnish Plywood International Flat Roofing Contractors Advisory Board Forestry Commission Furniture Industry Research Association Institution of Structural Enginee
5、rs Local Authority Organizations Mineral Bonded Board Products Federation National Federation of Roofing Contractors National House-Building Council National Panel Products Association Royal Institute of British Architects Structural Board Association Timber Research and Development Association Timb
6、er Trade Federation Wood Panel Industries Federation Zurich Municipal Building Guarantee Co-opted members Amendments issued since publication Amd. No. Date Comments 9124 June 1996 Indicated by a sideline in the marginBSEN635-2:1995 BSI 07-1999 i Contents Page Committees responsible Inside front cove
7、r National foreword ii Foreword 2 Text of EN 635-2 3 List of references Inside back coverBSEN635-2:1995 ii BSI 07-1999 National foreword This British Standard has been prepared by Technical Committee B/541 and is the English language version of EN 635-2:1995 Plywood Classification by surface appeara
8、nce Part 2: Hardwood, published by the European Committee for Standardization (CEN). EN635-2 was produced as a result of international discussions in which the United Kingdom took an active part. BS EN 635-1, BS EN 635-2 and BS EN 635-3 together supersede BS6566-6:1985, which will be withdrawn in ac
9、cordance with CEN provisions within 6 months of completion of the full package of standards covering plywood and related test methods. These standards are: The method of classification used in BS EN 635-2 and BS EN 635-3 is similar to that of BS6566-6:1985. But although the appearance classes in BSE
10、N635-2 and BSEN635-3 are identified as E, I, II, III and IV, these classes do not correspond exactly to the appearance classes E, I, II, III and IV of BS6566-6. The BSEN635 standards are thus not technically equivalent to BS6566-6. NOTEEN 635-2 makes informative reference to EN 636-1, EN 636-2 and E
11、N 636-3 which are currently in preparation. 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 British Standard does not of itself confer immunity from legal obligation
12、s. EN 310 EN 313-1 EN 313-2 EN 314-1 EN 314-2 EN 315 EN 322 EN 323 EN 324-1 EN 324-2 EN 325 EN 635-1 EN 635-2 EN 635-3 EN 636-1 EN 636-2 EN 636-3 EN 1072 EN 1084 Cross-reference Publication referred to Corresponding British Standard EN 635-1:1994 BS EN 635 Plywood Classification by surface appearanc
13、e Part 1:1995 General Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indi
14、cated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 635-2 May 1995 ICS 79.060.10 Descriptors: Wood board, plywood, deciduous timber, classifications, appearance, defects English version Plywood Classification by surface appearance Part 2: Hardw
15、ood Contreplaqu Classification selon laspect des faces Partie 2: Bois feuillus Sperrholz Klassifizierung nach dem Aussehen der Oberflche Teil 2: Laubholz This European Standard was approved by CEN on 1995-04-14. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulat
16、e 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 European Standard exist
17、s 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 national bodies of Aust
18、ria, 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 Normung Central Secretariat: rue
19、 de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No. EN 635-2:1995 EEN635-2:1995 BSI 07-1999 2 Foreword This European Standard has been prepared by the Technical Committee CEN/TC112,
20、Wood-based panels, of which the secretariat is held by DIN. This standard is one of a series of standards for the classification of plywood by surface appearance. The other Parts of this series are listed in clause2 and Annex A. This European Standard shall be given the status of a national standard
21、, either by publication of an identical text or by endorsement, at the latest by November1995, and conflicting national standards shall be withdrawn at the latest by November1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard
22、: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Classification by surface appearance 3 3.1 Appearance classes
23、 3 3.2 Permissible characteristics and defects 3 Annex A (informative) Bibliography 7 Table 1 Classification according to characteristicsinherent in wood 4 Table 2 Classification according to manufacturing defects 6EN635-2:1995 BSI 07-1999 3 1 Scope This European Standard specifies the nature and li
24、mits of characteristics inherent in wood and manufacturing defects enabling the visual assessment of the plywood for allocation to an appearance class. This classification is a contribution to assessing the finishing suitability of plywood. This Part of EN635 applies to plywood, the surface veneers
25、of which are made from hardwood 1)species. It does not apply to overlaid panels. 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 publicatio
26、ns 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 635-1, Plywood
27、 Classification by surface appearance Part 1: General. 3 Classification by surface appearance 3.1 Appearance classes Assessment of characteristics and defects for determination of appearance class shall be carried out in accordance with EN635-1. Surface classification shall be based on the permissib
28、le characteristics and defects within each of the appearance classes as specified in3.2. NOTEGuidance on selection of finishing for each appearance class is given in ENV635-4. 3.2 Permissible characteristics and defects Each surface shall be individually assigned to one of the appearance classes E,
29、I, II, III, IV, as defined by the permissible characteristics and defects indicated in Table 1 and Table 2. 1) In English, this means conventionally broadleaved species.EN 635-2:1995 4 BSI 07-1999 3.2.1 Classification according to characteristics inherent in wood Table 1 Classification according to
30、characteristics inherent in wood Categories of characteristics Appearance class E I II III IV 3.2.1.1 Pin knots a Practically absent 3/m 2permitted Permitted 3.2.1.2 Sound intergrown knots Permitted up to an individual diameter of: 15 mm provided their cumulative diameter does not exceed 30 mm/m 2 3
31、5 mm 50 mm Permitted, but see note Such knots may have splits provided they are very slight slight 3.2.1.3 Unsound or non-adhering knots and knot holes Permitted up to an individual diameter of: Permitted, but see note 6 mm if filled and up to a number of 2/m 2 5 mm if unrepaired, 25 mm if filled an
32、d up to a number of 3/m 2 40 mm 3.2.1.4 Splits Open Permitted if less than: 1/10 1/3 1/3 Permitted, but see note of panel length up to an individual width of: 3 mm 5 mm 20mm and up to a number of: 3/m 3/m 3/m of panel width if properly filled if unrepaired, or unlimited if all filled Closed Permitte
33、dEN 635-2:1995 BSI 07-1999 5 Table 1 Classification according to characteristics inherent in wood Categories of characteristics Appearance class E I II III IV 3.2.1.5 Abnormalities due to insects, marine borers and parasitic plants Not permitted Not permitted Marks of parasitic plants not permitted.
34、 Insects and marine borer holes permitted up to a: Permitted, but seenote diameter of 3 mm vertically to the plane of the panel up to 10/m 2 width of 15 mm and a length of 60 mm up to3/m 2 3.2.1.6 Inbark Not permitted Permitted up to a width of: Permitted, but seenote 5 mm if properly filled 25 mm 3
35、.2.1.7 Irregularities in the structure of the wood Practically absent Permitted Permitted if very slight if slight 3.2.1.8 Discoloration which is not wood destroying Permitted if low contrast Permitted 3.2.1.9 Fungal decay, which is wood destroying Not permitted Not permitted 3.2.1.10 Other characte
36、ristics Practically absent To be considered under the category which they most closely resemble NOTECharacteristics inherent to the wood are permitted provided that they do not impair the serviceability of the panel. a Pin knots: sound intergrown knots of no more than 3 mm diameter.EN 635-2:1995 6 B
37、SI 07-1999 3.2.2 Classification according to manufacturing defects Table 2 Classification according to manufacturing defects Categories of defects Appearance class E I II III IV 3.2.2.1 Open joints Not permitted Not permitted Permitted up to a width of: 3 mm 5 mm 25 mm and up to a number of: 1/m 2/m
38、 unlimited of panel width with joints filled if more than 1 mm in width unfilled unfilled 3.2.2.2 Overlaps Not permitted Permitted up to a number of1/m 2and up to 100 mm length Permitted up to a number of 2/m 2 Permitted but seenote 3.2.2.3 Blisters Not permitted 3.2.2.4 Hollows, imprints and bumps
39、Not permitted Permitted if slight Permitted 3.2.2.5 Roughness Not permitted Permitted if slight Permitted 3.2.2.6 Sanding through Not permitted Permitted up to an extent of: 1% 5 % (but see note) of panel surface 3.2.2.7 Glue penetration Not permitted Permitted: if slight and occasional up to an ext
40、ent of 5 % of the panel surface Permitted but seenote 3.2.2.8 Foreign particles Not permitted Ferrous particles not permitted 3.2.2.9 Repairs: a) patches; b) shims; c) synthetic fillers. Practically without defects Permitted if properly made and tightly filled up to a number of: 3/m 2 6/m 2 unlimite
41、d Not permitted Not permitted Permitted within the limits specified in the categories unlimited 3.2.2.10 Defects at the edges of the panel due tosanding or sawing Practically without defects Permitted up to: Permitted but seenote 2 mm 5 mm from the edge 3.2.2.11 Other characteristics or defects To b
42、e considered under the category which they most closely resemble NOTEManufacturing defects are permitted provided that they do not impair the serviceability of the panel.EN635-2:1995 BSI 07-1999 7 Annex A (informative) Bibliography EN 313-1, Plywood Classification and terminology Part 1: Classificat
43、ion. EN 313-2, Plywood Classification and terminology Part 2: Terminology. EN 635-1, Plywood Classification by surface appearance Part 1: General. EN 635-2, Plywood Classification by surface appearance Part 2: Hardwood. ENV 635-4, Guideline Plywood Classification by surface appearance Part 4: Parame
44、ters of ability for finishing 2) . EN 636-1, Plywood Specifications Part 1: Requirements for plywood for use in dry conditions. EN 636-2, Plywood Specifications Part 2: Requirements for plywood for use in humid conditions. EN 636-3, Plywood Specifications Part 3: Requirements for plywood for use in
45、exterior conditions. 2) At present at the draft stage.8 blankBSEN635-2:1995 BSI 07-1999 List of references See national foreword.BS EN 635-2:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. I
46、t presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim o
47、f BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:020899690
48、00. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Te
49、l:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products
