BRITISH STANDARD BS EN 635 1 1995 Plywood — Classification by surface appearance — Part 1 General The European Standard EN 635 1 1994 has the status of a British Standard BS EN 635 1 1995 This British[.]
BRITISH STANDARD Plywood — Classification by surface appearance — Part 1: General The European Standard EN 635-1:1994 has the status of a British Standard BS EN 635-1:1995 BS EN 635-1:1995 Committees responsible for this British Standard The United Kingdom participation in the preparation of this European 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 Products Federation Zurich Insurance Company 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 June 1995 © BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 92/11486 DC ISBN 580 24504 Amendments issued since publication Amd No Date Comments BS EN 635-1:1995 Contents Committees responsible National foreword Foreword Text of EN 635-1 List of references © BSI 03-1999 Page Inside front cover ii Inside back cover i BS EN 635-1:1995 National foreword This British Standard has been prepared under the direction of the Sector Board for Building and Civil Engineering and is the English language version of EN 635-1:1994 Plywood — Classification by surface appearance — Part 1: General, published by the European Committee for Standardization (CEN) It is one of three Parts dealing with the classification of plywood by surface appearance The other two are: BS EN 635-2, Plywood — Classification by surface appearance — Part 2: Hardwood BS EN 635-3, Plywood — Classification by surface appearance — Part 3: Softwood BS EN 635-1, BS EN 635-2 and BS EN 635-3 together supersede BS 6566-6:1985, which will be withdrawn on publication of the other two parts of BS EN 635 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 EN 635-3 are identified as E, I, II, III and IV, these classes not correspond exactly to the appearance classes (grades) 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 635-2 EN 635-3 a BS EN 635 Plywood — Classification by surface appearance Part 2:1995 Hardwooda Part 3:1995 Softwooda 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 6, 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 03-1999 EUROPEAN STANDARD EN 635-1 NORME EUROPÉENNE December 1994 EUROPÄISCHE NORM ICS 79.060.10 Descriptors: Wooden boards, plywood, classifications, appearance, defects English version Plywood — Classification by surface appearance — Part 1: General Contreplaqué — Classification selon l’aspect des faces — Partie 1: Généralités Sperrholz — Klassifizierung nach dem Aussehen der Oberfläche — Teil 1: Allgemeines This European Standard was approved by CEN on 1994-12-05 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 standards 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 © 1994 Copyright reserved to CEN members Ref No EN 635-1:1994 E EN 635-1:1994 Foreword This European Standard was prepared by Working Group 2, Plywood, (Secretariat: France) of Technical Committee CEN/TC 112, Wood-based panels, (Secretariat: Germany) 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 The text is based on ISO 2426, which has been elaborated with European participation 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 endorsement, at the latest by June 1995, and conflicting national standards shall be withdrawn at the latest by June 1995 In accordance with the common CEN/CENELEC Rules, 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, United Kingdom Contents Foreword Scope Normative references Classification by surface appearance Rules for classification Annex A (informative) Bibliography Page 3 © BSI 03-1999 EN 635-1:1994 Scope This part of EN 635 establishes general rules for the classification of plywood by its surface appearance It does not apply to overlaid plywood Normative references This European Standard 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, 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 635-2, Plywood — Classification by surface appearance — Part 2: Hardwood EN 635-3, Plywood — Classification by surface appearance — Part 3: Softwood Classification by surface appearance 3.1 Classes Classification of plywood by surface appearance is made according to the number and the extent of certain natural characteristics of wood and the defects that come from the manufacturing process Five appearance classes are distinguished, identified with the following codes: E, I, II, III, IV 3.2 Characteristics and defects taken into consideration Determination of the appearance class, based on the appearance of the panel surfaces, shall take into account the categories of characteristics given in 3.2.1 and defects given in 3.2.2 3.2.1 Characteristics inherent in wood Category 3.2.1.1 3.2.1.2 3.2.1.3 3.2.1.4 3.2.1.5 Pin knots Sound intergrown knots a) Unsound knots b) Non-adhering and partially adhering knots c) Holes, except those due to insects, marine borers and parasitic plants a) Splits b) Checks Abnormalities due to insects, marine borers and parasitic plants 3.2.1.7 a) Resin pockets b) Resin streaks c) Inbark Irregularities in the structure of the wooda 3.2.1.8 Discoloration which is not wood-destroying 3.2.1.9 3.2.1.10 Fungal decay which is wood-destroying Other characteristics 3.2.1.6 a Type 1) Dog holes 2) Knot holes 1) Open 2) Closed 1) Small worm holes 2) Large worm holes 3) Marine borer holes 4) Marks from parasitic plants 1) Angle grain 2) Curly grain 3) Interlocked grain 4) Spiral grain 1) Blue stain, mould and fungal discoloration 2) Coloured sapstain 3) False heartwood 4) Other discoloration such as chemical stain and colour streaks Rot To be considered under the category which they most closely resemble When irregularities of grain result in roughness, these shall be considered as one category of characteristics © BSI 03-1999 EN 635-1:1994 3.2.2 Manufacturing defects Category 3.2.2.6 3.2.2.7 3.2.2.8 3.2.2.9 Open joints Overlaps Blisters a) Hollows b) Imprints c) Bumps Roughness, other than that due to irregularities in the structure of the wood Sanding through Glue penetration Foreign particles Repairs 3.2.2.10 Defects at the edges of the panel 3.2.2.11 Other defects 3.2.2.1 3.2.2.2 3.2.2.3 3.2.2.4 3.2.2.5 Type Metal, mineral, 1) Patches 2) Shims 3) Synthetic fillers 1) Sanding defects 2) Sawing defects 3) Missing wood To be considered under the category which they most closely resemble 3.3 Classification by appearance of panels The appearance class of plywood is determined by the classes of its surfaces The class of the plywood first describes the class of the face followed by the class of the back Rules for classification 4.1 Classification for hardwood and softwood The permissible characteristics and defects for each of these appearance classes of this European Standard are specified in Part for hardwood and in Part for softwood 4.2 Conditions of admissibility for inherent characteristics of wood, and manufacturing defects 4.2.1 General Characteristics and defects which are limited in number, size, or extent, are either enumerated, or evaluated over the total surface of the panel This number or extent is expressed per square metre of panel, with the exception of checks, splits and open joints which are related to one metre of panel width The number and the extent of characteristics and defects shall be defined as follows and rounded off to the nearest unit a) For knots and holes: 1) individual diameter; 2) cumulative diameters expressed per square metre of panel surface NOTE The diameter of a knot or hole is conventionally defined as the diameter across the general direction of the grain of the veneer b) For checks, splits and open joints: 1) individual length; 2) individual width; 3) number per metre of panel width © BSI 03-1999 EN 635-1:1994 4.2.2 Joints In appearance class I to IV, the number and the width of veneers which form the outer plies of a panel is not restricted, provided the joints are well made The veneers forming the outer plies of class I shall be well matched for colour and have similar grain The outer plies shall be laid with the joints approximately parallel to the edges of the panel In class E, the outer ply using rotary cut veneer may be of one or two veneers provided that the joint is well made, approximately at the centre of the panel, approximately parallel to the edges of the panel and that the veneers are well matched for colour and of similar grain 4.2.3 Inclusions The inclusion of foreign particles likely to damage the machining equipment is not permitted 4.2.4 Repairs Patches and shims used for the repairs shall fit and be properly fixed The matching for colour and grain shall be in accordance with the requirements for the appropriate appearance class Synthetic filling is permitted subject to the appearance class requirement © BSI 03-1999 EN 635-1:1994 Annex A (informative) Bibliography EN 313-2, Plywood — Classification and terminology — Part 2: Terminology ENV 635-4, Plywood — Classification by surface appearance — Part 4: Parameters of ability for finishing, Guideline1) 1) At present at the draft stage © BSI 03-1999 BS EN 635-1:1995 List of references See national foreword © BSI 03-1999 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI Ð 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 finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 020 8996 9000 Fax: 020 8996 7400 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 Tel: 020 8996 9001 Fax: 020 8996 7001 In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, 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 and services Contact the Information Centre Tel: 020 8996 7111 Fax: 020 8996 7048 Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: 020 8996 7002 Fax: 020 8996 7001 Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means ± electronic, photocopying, recording or otherwise ± without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtained from the Copyright Manager Tel: 020 8996 7070