1、BRITISH STANDARD BS EN 323:1993 Wood-based panels Determination of density The European Standard EN 323:1993 has the status of a British Standard UDC 674.815:620.1:531.754BSEN 323:1993 This British Standard, having been prepared under the directionof the Technical SectorBoard for Building and Civil
2、Engineering (B/-), was published under the authority ofthe Standards Board and comesinto effect on 15April1993 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 90/11136 DC ISBN 0 580 21058 8 Cooperating organizations The Europe
3、an Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finlan
4、d Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Uni
5、ficazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Associ
6、ation suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 323:1993 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 323 3 National annex NA (informative)
7、 Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN 323:1993 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the Technical Sector Board for Building and Civil Engineering and is the English l
8、anguage version of EN 323:1993, Wood-based panels Determination of density, published by the European Committee for Standardization (CEN). EN323 was produced as a result of international discussion in which the UK took an active part. The principle of this method is technically equivalent to A.4 of
9、BS1142:1989 Specification for fibre building boards and to clause8 of BS5669 Particleboard Part1:1989 Methods of sampling, conditioning and test, both of which will be withdrawn in due course. A British Standard does not purport to include all the necessary provisions of a contract. Users of British
10、 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, theEN title page, pages 2 to 6, an inside back cover
11、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 EUROPENNE EUROPISCHE NORM EN 323 February 1993 UDC 674.815:620.1:531.754 Descriptors: Wood-b
12、ased panel, fibreboard, particleboard, plywood, OSB, cement-bonded particleboard, test method, density (mass/volume) English version Wood-based panels Determination of density Panneaux base de bois Dtermination de la masse volumique Holzwerkstoffe Bestimmung der Rohdichte This European Standard was
13、approved by CEN on 1992-12-15. 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
14、 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 notifi
15、ed 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.
16、 CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 323:1993 EEN 323:1993 BSI 08-1999 2 Foreword This European Standard was prepared by Wo
17、rking Group 4 “Common test methods” (Secretariat: United Kingdom) of Technical Committee CEN/TC 112 “Wood-based panels” (Secretariat: Germany). The text is based on ISO9427:1989 which has been elaborated with European participation. This Standard is one of a series of standards specifying methods of
18、 test for determining dimensions and properties of wood-based panels. 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 August1993, and conflicting natio
19、nal standards shall be withdrawn at the latest by December1994. 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
20、, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test pieces 3 6 Procedure 4 7 Expression of results 4 8 Test report 4 Annex A (informative) Bibliography 5 Figure 1 Cross-section of a tubular board 3
21、Figure 2 Point of measurement 4EN 323:1993 BSI 08-1999 3 1 Scope This European Standard specifies a method for determining the density of test pieces of wood-based panels. Such result may be used to estimate the density of wood-based panels according to EN326-1. 2 Normative references This European
22、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 appl
23、y 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 325, Wood-based panels Determination of dimensions of test pieces. EN 326-1, Wood-based panels Sampling cutting and inspection Part
24、 1: Sampling and cutting of test pieces and expression of test results 1) . 3 Principle Density is determined as the ratio of the mass of each test piece, to its volume, both measured at the same moisture content, and the use of these results to estimate the density of whole boards. 4 Apparatus 4.1
25、Instrument for thickness measurement Micrometer or similar measuring instrument, having flat and parallel circular measuring surfaces of (16 1)mm diameter and an operation force of(4 1)N. The graduation of the apparatus shall allow reading to0,01mm. 4.2 Instrument for length and width measurement Sl
26、iding caliper, or any other instrument with measuring surfaces of at least5mm width, graduated to allow reading to0,1mm. 4.3 Balance Balance, allowing measurement to0,01 g. 5 Test pieces 5.1 Sampling and cutting Sampling and cutting of the test pieces shall be carried out in accordance with EN326-1.
27、 5.2 Dimensions The test pieces shall be square in shape, with sides of a nominal length of50mm. In the case of extruded panels, cellular panels, or panels of similar structure with cavities parallel to the length or width of the test piece, the total length or width of the test piece shall be at le
28、ast twice the length or width of any individual core element (i.e.two tube diameters plus two web thicknesses) and the test pieces shall have a symmetrical cross-sectional area as shown inFigure 1. 5.3 Conditioning If necessary, the test pieces shall be conditioned to constant mass in an atmosphere
29、with a relative humidity of (65 5)% and a temperature of(20 2) C. Constant mass is considered to be reached when the results of two successive weighing operations, carried out at an interval of24h, do not differ by more than0,1% of the mass of the test piece. 1) At present at the draft stage Figure
30、1 Cross-section of a tubular boardEN 323:1993 4 BSI 08-1999 6 Procedure 6.1 Weighing Weigh each test piece to an accuracy of0,01g. 6.2 Measurement of dimensions Measure the dimensions of each test piece, in accordance with EN325, as follows. a) Measure the thickness, t, at a point of the intersectio
31、n of the diagonals as shown inFigure 2 (unless this coincides with a surface irregularity which may influence the measurement) to an accuracy of0,05 mm. Apply the measuring instrument slowly to the surfaces of the test piece. b) Measure b 1and b 2 , at two points, parallel to the edges of the test p
32、iece, along lines which pass through the centres of opposite edges as shown inFigure 2, to an accuracy of 0,1 mm. 7 Expression of results 7.1 The density p of each test piece (in kg/m 3 ) shall be calculated from the formula: where m is the mass of the test pieces in g b 1 , b 2and t are in mm, as d
33、efined in6.2. 7.2 The density of a board shall be obtained by calculating the arithmetic mean of the densities of all the test pieces taken from the same board and is expressed in kg/m 3to three significant figures. 8 Test report As described in EN326-1. Figure 2 Point of measurementEN 323:1993 BSI
34、08-1999 5 Annex A (informative) Bibliography EN 309, Particleboards Definition and classification. EN 313-1, Plywood Classification and terminology Part 1: Classification. EN 316, Fibreboards Definition classification and symbols. EN 633, Cement-bonded particleboards Definition 2) . ISO 9427:1989, W
35、ood-based panels Determination of density. 2) At present at the draft stage6 blankBSEN 323:1993 BSI 08-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Technical Sector Board for Building an
36、d Civil Engineering (B/-) to Technical Committee B/541, upon which the following bodies were represented: American Plywood Association Association of British Plywood and Veneer Manufacturers British Woodworking Federation Chartered Institute of Building Co-ordinator for Timber and Timber Products Co
37、uncil of the Forest Industries of British Columbia Department of the Environment (Timber Division Building Research Establishment) Fibre Building Board Organisation (FIDOR) Finnish Plywood International Flat Roofing Contractors Advisory Board Forestry Commission Furniture Industry Research Associati
38、on Institution of Structural Engineers National Federation of Roofing Contractors National House-building Council National Panel Products Association Royal Institute of British Architects Timber Research and Development Association Timber Trade Federation United Kingdom and Ireland Particleboard Ass
39、ociation Coopted member National annex NB (informative) Cross-references Publication referred to Corresponding British Standard EN 325:1993 BS EN 325:1993 Wood-based panels Determination of dimensions of test piecesBS EN 323:1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitutio
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