BS EN 635-3-1995 Plywood — Classification by surface appearance — Part 3 Softwood.pdf

BRITISH STANDARD BS EN 635-3:1995 Incorporating Amendment No. 1 Plywood Classification by surface appearance Part 3: Softwood The European Standard EN 635-3:1995 has the status of a British Standard ICS 79.060.10 BS EN 635-3:1995 This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of 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 92/11488 DC ISBN 0 580 24772 4 Committees 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 Woodworking 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 Engineers 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 Timber Trade Federation Wood Panel Industries Federation Zurich Municipal Building Guarantee Co-opted members Amendments issued since publication Amd. No.DateComments 9125June 1996Indicated by a sideline in the margin BS EN 635-3:1995 © BSI 07-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 635-33 List of referencesInside back cover BS EN 635-3:1995 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 635-3:1995, Plywood Classification by surface appearance Part 3: Softwood, published by the European Committee for Standardization (CEN). EN 635-3 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 BS EN 635-1, BS EN 635-2 and BS EN 635-3 together supersede BS 6566-6:1985, which will be withdrawn in accordance with CEN provisions within 6 months of completion of the full package of standards covering plywood and related test methods.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 BS 6566-6:1985. But although the appearance classes in BS EN 635-2 and BS 635-3 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 BS 6566-6. The BS EN 635 standards are thus not technically equivalent to BS 6566-6. NOTEEN 635-3 makes informative references to EN 636-1, EN 636-2 and EN 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 obligations. EN 310EN 325 EN 313-1EN 635-1 EN 313-2EN 635-2 EN 314-1EN 635-3 EN 314-2EN 636-1 EN 315EN 636-2 EN 322EN 636-3 EN 323EN 1072 EN 324-1EN 1084 EN 324-2 Cross-references Publication referred toCorresponding British Standard EN 635-1:1994BS EN 635 Plywood Classification by surface appearance 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 indicated in the amendment table on the inside front cover. ? EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 635-3 May 1995 ICS 79.060.10 Descriptors: Wood board, plywood, coniferous timber, classifications, appearance, defects English version Plywood Classification by surface appearance Part 3: Softwood Contreplaqué Classification selon l aspect des faces Partie 3: Bois résineux Sperrholz Klassifizierung nach dem Aussehen der Oberfläche Teil 3: Nadelholz This European Standard was approved by CEN on 1995-04-14. 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 obtained 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 Secretariat has the same status as the official versions. CEN members are the national bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue 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 635-3:1995 E ? EN 635-3:1995 © BSI 07-1999 2 Foreword This European Standard has been prepared by the Technical Committee CEN/TC 112, 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 clause 2 and Annex A. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1995, and conflicting national standards shall be withdrawn at the latest by November 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Classification by surface appearance3 3.1 Appearance classes3 3.2 Permissible characteristics and defects3 Annex A (informative) Bibliography7 Table 1 Classification according to characteristics inherent in wood4 Table 2 Classification according to manufacturing defects6 ? EN 635-3:1995 © BSI 07-19993 1 Scope This European Standard specifies the nature and limits 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 EN 635 applies to plywood, the surface veneers of which are made from softwood 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 publications 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 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 EN 635-1. Surface classification shall be based on the permissible characteristics and defects within each of the appearance classes as specified in 3.2. NOTEGuidance on selection of finishing for each appearance class is given in ENV 635-4. 3.2 Permissible characteristics and defects Each surface shall be individually assigned to one of the appearance classes E, I, II, III, IV, as defined by the permissible characteristics and defects indicated in Table 1 and Table 2. ? EN 635-3:1995 4 © BSI 07-1999 3.2.1 Classification according to characteristics inherent in wood Table 1 Classification according to characteristics inherent in wood Categories of characteristicsAppearance class EIIIIIIIV 3.2.1.1 Pin knotsaPractically absent 3/m2 Permitted 3.2 1.2 Sound intergrown knotsPermitted up to an individual diameter of: 15 mm provided their cumulative diameter does not exceed 30 mm/m2 50 mm60 mmPermitted but see note Such knots may have splits provided they are very slightslight 3.2.1.3 Unsound or non-adhering knots and knot holes Permitted up to an individual diameter of: 6 mm if filled and up to a number of 2/m2 5 mm if unrepaired, 25 mm if filled and up to a number of 6/m2 40 mmPermitted but see note 3.2.1.4 SplitsOpenPermitted if less than:Length unlimited 1/101/31/2 of panel length up to an individual width of: 3 mm10 mm15 mm25 mm and up to a number of: 3/m3/m3/munlimited of panel width if properly filledAll splits greater than 2 mm in width to be filled ClosedPermitted 3.2.1.5 Anomalies due to insects, marine borers, and parasitic plants Not permitted Not permittedMarks of parasitic plants not permitted. Insects and marine borer holes permitted up to a: Permitted but see note diameter of 3 mm vertically to the plane of the panel up to a number of 10/m2 width up to 15 mm and a length of 60 mm up to a number of 3/m2 ? EN 635-3:1995 © BSI 07-19995 Table 1 Classification according to characteristics inherent in wood Categories of characteristicsAppearance class EIIIIIIIV 3.2.1.6Resin pockets and inbarkNot permitted Not permittedPermitted up to a width of:Permitted but see note 6 mm if properly filled40 mm Resin streaksNot permittedPermitted is slightPermitted 3.2.1.7 Irregularities in the structure of the wood Practically absent PermittedPermitted if very slightif slight 3.2.1.8 Discoloration which is not wood destroying Permitted if low contrastPermitted 3.2.1.9 Fungal decay, wood destroyingNot permitted Not permitted 3.2.1.10 Other characteristicsPractically 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. aPin knots: sound intergrown knots of no more than 3 mm diameter. ? EN 635-3:1995 6 © BSI 07-1999 3.2.2 Classification according to manufacturing defects Table 2 Classification according to manufacturing defects Categories of defectsAppearance class EIIIIIIIV 3.2.2.1Open jointsNot permittedNot permittedPermitted up to a width of: 3 mm10 mm25 mm and up to a number of: 1/m2/munlimited of panel width with joints filled if more than 1 mm in width unfilledunfilled 3.2.2.2Over lapsNot permittedPermitted up to a number of 1/m2 and up to 100 mm length Permitted up to a number of 2/m2 Permitted but see note 3.2.2.3BlistersNot permitted 3.2.2.4Hollows, imprints and bumpsNot permittedPermitted if slightPermitted 3.2.2.5RoughnessNot permittedPermitted if slightPermitted 3.2.2.6Sanding throughNot permittedPermitted up to an extent of: 1 %5 % (but see note) of panel surface 3.2.2.7Glue penetrationNot permittedPermittedPermitted but see note if slight and occasional up to an extent of 5 % of the panel surface 3.2.2.8Foreign particlesNot permittedNot permittedFerrous particles not permitted 3.2.2.9Repairs a) Patches b) Shims c) Synthetic fillers Practically without defects Permitted if properly made and tightly filled up to a number of: 5/m2 unlimited Not permittedNot permittedPermitted with limits of the category it most closely resembles Unlimited 3.2.2.10Defects at the edges of the panel due to sanding or sawing Practically without defects Permitted up to:Permitted but see note 2 mm5 mm5 mm from the edge 3.2.2.11Other defectsTo be considered under the category which they most closely resemble NOTEManufacturing defects are permitted provided that they do not impair the serviceability of the panel. EN 635-3:1995 © BSI 07-19997 Annex A (informative) Bibliography EN 313-1, Plywood Classification and terminology Part 1: Classification. 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: Parameters of ability for finishing1). 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 exterior conditions. 1)At present at the draft stage. 8 blank BS EN 635-3:1995 © BSI 07-1999 List of references See national foreword. 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