www bzfxw com 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 Br[.]
BRITISH STANDARD BS EN 635-3:1995 Incorporating Amendment No 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 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 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 580 24772 Amendments issued since publication Amd No Date Comments 9125 June 1996 Indicated by a sideline in the margin BS EN 635-3:1995 Contents Committees responsible National foreword Foreword Text of EN 635-3 List of references © BSI 07-1999 Page Inside front cover ii Inside back cover i BS EN 635-3:1995 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 months of completion of the full package of standards covering plywood and related test methods These standards are: EN 310 EN 325 EN 313-1 EN 635-1 EN 313-2 EN 635-2 EN 314-1 EN 635-3 EN 314-2 EN 636-1 EN 315 EN 636-2 EN 322 EN 636-3 EN 323 EN 1072 EN 324-1 EN 1084 EN 324-2 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 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 Cross-references Publication referred to Corresponding British Standard EN 635-1:1994 BS EN 635 Plywood — Classification by surface appearance Part 1:1995 General NOTE EN 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 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 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 ii © BSI 07-1999 EUROPEAN STANDARD EN 635-3 NORME EUROPÉENNE May 1995 EUROPÄISCHE NORM 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 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 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 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 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 Foreword Scope Normative references Classification by surface appearance 3.1 Appearance classes 3.2 Permissible characteristics and defects Annex A (informative) Bibliography Table — Classification according to characteristics inherent in wood Table — Classification according to manufacturing defects Page 3 3 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 07-1999 EN 635-3:1995 Scope Classification by surface appearance 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 3.1 Appearance classes 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 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 NOTE Guidance 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 and Table ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 07-1999 Table — Classification according to characteristics inherent in wood Categories of characteristics Appearance class E 3.2.1.1 Pin knots a 3.2 1.2 Sound intergrown knots Practically absent I 3/m2 II III IV Permitted Permitted up to an individual diameter of: 15 mm provided their 50 mm 60 mm cumulative diameter does not exceed 30 mm/m2 Such knots may have splits provided they are very slight slight 3.2.1.3 Unsound or non-adhering knots Permitted up to an individual diameter of: and knot holes mm if filled and up to a mm if unrepaired, 40 mm number of 2/m2 25 mm if filled and up to a number of 6/m2 3.2.1.4 Splits Open Permitted if less than: 1/10 1/3 1/2 of panel length up to an individual width of: mm 10 mm 15 mm and up to a number of: 3/m 3/m 3/m of panel width if properly filled All splits greater than mm in width to be filled Closed Permitted 3.2.1.5 Anomalies due to insects, marine Not permitted Not permitted Marks of parasitic plants not permitted borers, and parasitic plants Insects and marine borer holes permitted up to a: diameter of mm width up vertically to the plane to 15 mm and a of the panel up to a length of 60 mm number of 10/m2 up to a number of 3/m2 EN 635-3:1995 3.2.1 Classification according to characteristics inherent in wood Permitted but see note Permitted but see note Length unlimited ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 25 mm unlimited Permitted but see note © BSI 07-1999 © BSI 07-1999 Table — Classification according to characteristics inherent in wood Categories of characteristics Appearance class E 3.2.1.6 Resin pockets and inbark Not permitted Not permitted Resin streaks 3.2.1.7 Irregularities in the structure of the wood I Not permitted Practically absent 3.2.1.8 Discoloration which is not wood destroying II Permitted up to a width of: mm if properly filled 40 mm Permitted is slight Permitted Permitted if very slight Not permitted Not permitted 3.2.1.10 Other characteristics Practically absent IV Permitted but see note Permitted if slight Permitted if low contrast 3.2.1.9 Fungal decay, wood destroying III Permitted To be considered under the category which they most closely resemble NOTE Characteristics inherent to the wood are permitted provided that they not impair the serviceability of the panel a Pin knots: sound intergrown knots of no more than mm diameter ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ EN 635-3:1995 Table — Classification according to manufacturing defects Categories of defects Appearance class E 3.2.2.1 Open joints Not permitted I Not permitted 3.2.2.2 Over laps Not permitted 3.2.2.3 3.2.2.4 3.2.2.5 3.2.2.6 Blisters Hollows, imprints and bumps Roughness Sanding through Not permitted Not permitted Not permitted Not permitted 3.2.2.7 Glue penetration II III Permitted up to a width of: mm 10 mm and up to a number of: 1/m 2/m of panel width with joints filled if more unfilled than mm in width Permitted up to a Permitted up to a number of 1/m and number of 2/m2 up to 100 mm length IV 25 mm unlimited unfilled Permitted but see note Permitted if slight Permitted if slight Permitted Permitted Permitted up to an extent of: 1% 5% (but see note) of panel surface Not permitted Permitted Permitted but see note if slight and up to an extent occasional of % of the panel surface Not permitted Not permitted Ferrous particles not permitted Practically Permitted if properly made and tightly filled up to a number of: without defects 5/m2 unlimited ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Foreign particles Repairs a) Patches b) Shims Not permitted Not permitted Permitted with limits of the category it Unlimited most closely resembles c) Synthetic fillers 3.2.2.10 Defects at the edges of the panel due to Practically Permitted up to: Permitted but sanding or sawing without defects mm see note mm mm from the edge 3.2.2.11 Other defects To be considered under the category which they most closely resemble 3.2.2.8 3.2.2.9 © BSI 07-1999 NOTE EN 635-3:1995 3.2.2 Classification according to manufacturing defects Manufacturing defects are permitted provided that they not impair the serviceability of the panel EN 635-3:1995 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 © BSI 07-1999 blank BS EN 635-3:1995 List of references See national foreword © BSI 07-1999 BS EN 635-3:1995 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone 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