1、BRITISH STANDARD BS EN 635-3:1995 Incorporating Amendment No. 1 Plywood Classification by surface appearance Part 3: Softwood The European Standard EN635-3:1995 has the status of a British Standard ICS 79.060.10BSEN635-3:1995 This British Standard, having been prepared under the directionof the Sect
2、or Board forBuilding and Civil Engineering, was published underthe authorityof the Standards Board and comesintoeffect 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 Committe
3、es 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 Woodworki
4、ng 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 Loc
5、al 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 Tra
6、de Federation Wood Panel Industries Federation Zurich Municipal Building Guarantee Co-opted members Amendments issued since publication Amd. No. Date Comments 9125 June 1996 Indicated by a sideline in the marginBSEN635-3:1995 BSI 07-1999 i Contents Page Committees responsible Inside front cover Nati
7、onal foreword ii Foreword 2 Text of EN 635-3 3 List of references Inside back coverBSEN635-3:1995 ii BSI 07-1999 National foreword This British Standard has been prepared by Technical Committee B/541 and is the English language version of EN635-3:1995, Plywood Classification by surface appearance Pa
8、rt 3: Softwood, published by the European Committee for Standardization (CEN). EN635-3 was produced as a result of international discussions in which the United Kingdom took an active part. BS EN635-1, BS EN635-2 and BS EN635-3 together supersede BS6566-6:1985, which will be withdrawn in accordance
9、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 EN635-2 and BS EN635-3 is similar to that of BS6566-6:1985. But although the appearance classes in BS EN635-2 and
10、 BS635-3 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 BS EN635 standards are thus not technically equivalent to BS6566-6. NOTEEN 635-3 makes informative references to EN636-1, EN636-2 and EN636-3 which
11、 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 310 EN
12、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 Cross-references Publication referred to Corresponding British Standard EN635-1:1994 BS EN635 Plywood Classification by surface appearance Part 1:1995
13、General Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN 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 am
14、endment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE 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 Contreplaq
15、u Classification selon laspect des faces Partie 3: Bois rsineux Sperrholz Klassifizierung nach dem Aussehen der Oberflche 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 conditio
16、ns 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 off
17、icial 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,
18、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 de Stassart 3
19、6, 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 EEN635-3:1995 BSI 07-1999 2 Foreword This European Standard has been prepared by the Technical Committee CEN/TC112, Wood-based pan
20、els, 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 andAnnex A. This European Standard shall be given the status of a national standard, either by pub
21、lication 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, Be
22、lgium, 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 3 3.2 Permis
23、sible 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 6EN635-3:1995 BSI 07-1999 3 1 Scope This European Standard specifies the nature and limits of chara
24、cteristics 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 of which are
25、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 h
26、ereafter. 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
27、 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 permissible characterist
28、ics 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, I, II, III, IV,
29、 as defined by the permissible characteristics and defects indicated inTable 1 andTable 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 characteristics Appearance class
30、 E I II III IV 3.2.1.1 Pin knots a Practically absent 3/m 2 Permitted 3.2 1.2 Sound intergrown knots Permitted up to an individual diameter of: 15mm provided their cumulative diameter does not exceed 30mm/m 2 50mm 60mm Permitted but see note Such knots may have splits provided they are very slight s
31、light 3.2.1.3 Unsound or non-adhering knots and knot holes Permitted up to an individual diameter of: 6mm if filled and up to a number of 2/m 2 5mm if unrepaired, 25mm if filled and up to a number of 6/m 2 40mm Permitted but see note 3.2.1.4 Splits Open Permitted if less than: Length unlimited 1/10
32、1/3 1/2 of panel length up to an individual width of: 3mm 10mm 15mm 25mm and up to a number of: 3/m 3/m 3/m unlimited of panel width if properly filled All splits greater than2mm in width to be filled Closed Permitted 3.2.1.5 Anomalies due to insects, marine borers, and parasitic plants Not permitte
33、d Not permitted Marks of parasitic plants not permitted. Insects and marine borer holes permitted up to a: Permitted but see note diameter of 3mm vertically to the plane of the panel up to a number of 10/m 2 width up to15mm and a length of 60 mm up to a number of3/m 2EN 635-3:1995 BSI 07-1999 5Table
34、 1 Classification according to characteristics inherent in wood Categories of characteristics Appearance class E I II III IV 3.2.1.6 Resin pockets and inbark Not permitted Not permitted Permitted up to a width of: Permitted but see note 6 mm if properly filled 40 mm Resin streaks Not permitted Permi
35、tted is slight Permitted 3.2.1.7 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, wood destroying Not permitted Not permitted 3.2.1.
36、10 Other characteristics 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 3mm diameter.E
37、N 635-3:1995 6 BSI 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 10 mm 25 mm and up to a n
38、umber of: 1/m 2/m unlimited of panel width with joints filled if more than1mm in width unfilled unfilled 3.2.2.2 Over laps Not permitted Permitted up to a number of 1/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, im
39、prints and bumps 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 Permitted but seenote
40、if slight and occasional up to an extent of5% of the panel surface 3.2.2.8 Foreign particles Not permitted 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 o
41、f: 5/m 2 unlimited Not permitted Not permitted Permitted with limits of the category it most closely resembles Unlimited 3.2.2.10 Defects at the edges of the panel due to sanding or sawing Practically without defects Permitted up to: Permitted but see note 2 mm 5 mm 5 mm from the edge 3.2.2.11 Other
42、 defects To 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.EN635-3:1995 BSI 07-1999 7 Annex A (informative) Bibliography EN 313-1, Plywood Classification and terminology Part 1
43、: 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 P
44、art 4: Parameters of ability for finishing 1) . 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 plywoo
45、d for use in exterior conditions. 1) At present at the draft stage.8 blankBSEN635-3:1995 BSI 07-1999 List of references See national foreword.BS EN 635-3:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing Britis
46、hStandards. It 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 c
47、onstant 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 BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover.
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