1、BRITISH STANDARD BS EN 319:1993 Particleboards and fibreboards Determination of tensile strength perpendicular to the plane of the board The European Standard EN 319:1993 has the status of a British Standard UDC 674.03:674.815.674:620.172BSEN319:1993 This British Standard, having been prepared under
2、 the directionof the Technical SectorBoard for Building and Civil Engineering, was publishedunder the authority ofthe Standards Board and comesinto effect on 15April1993 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 90/16000
3、 DC ISBN 0 580 21134 7 Cooperating organizations The European 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
4、 de normalisation Denmark Dansk Standardiseringsraad Finland 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 Standard
5、s Authority of Ireland Italy Ente Nazionale Italiano di Unificazione 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 Swede
6、n Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation UnitedKingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN319:1993 BSI 07-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Fo
7、reword 2 Text of EN 319 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-reference Inside back coverBSEN319:1993 ii BSI 07-1999 National foreword This British Standard has been prepared under the direction of the Technical Sector Board
8、for Building and Civil Engineering and is the English language version of EN319:1993 Particleboards and fibreboards Determination of tensile strength perpendicular to the plane of the board, published by the European Committee for Standardization (CEN). EN319 was produced as a result of internationa
9、l discussion in which the UK took an active part. The principle of the method is technically equivalent toA.13 of BS1142:1989 Specification for fibre building board and to12.2 of BS5669-1:1989 Particleboard Part 1 Methods of sampling, conditioning and test, both of whichwill be withdrawn in due cour
10、se. 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 compri
11、ses a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 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.EUROP
12、EAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 319 February 1993 UDC 674.03:674.815.674.817:620.172 Descriptors: Particleboard, fibreboard, cement-bonded particleboard, test method, transverse tensile strength, internal bond English version Particleboards and fibreboards Determination of tensile st
13、rength perpendicular to the plane of the board Panneaux de particules et panneaux de fibres Dtermination de la rsistance la traction perpendiculaire aux faces du panneau Spanplatten und Faserplatten Bestimmung der Zugfestigkeit senkrecht zur Plattenbene This European Standard was approved by CEN on
14、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 standards may be o
15、btained 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 S
16、ecretariat 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 UnitedKingdom. CEN European Commit
17、tee 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 319:1993 EEN319:1993 BSI 07-1999 2 Foreword This European Standard was prepared by Working Group 1 “Partic
18、leboards” (Secretariat: Germany) and Working Group 3 “Fibreboards” (Secretariat:Italy) of Technical Committee CEN/TC 112 “Wood-based panels” (Secretariat:Germany). This standard is one of a series specifying methods of test for determining the properties of particleboards and fibreboards. No existin
19、g 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 national standards shall be withdrawn at the latest by December1994. In accordance wi
20、th 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, UnitedKingdom. Contents Page Fo
21、reword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test pieces 3 6 Procedure 5 7 Expression of results 5 8 Test report 5 Annex A (informative) Bibliography 6 Figure 1 Examples of apparatus for testing tensile strength prependicular to the plane of the board 4EN319:1993 BSI 07-
22、1999 3 1 Scope This European Standard specifies a method for determining the resistance to tension perpendicular to the plane of the board (“internal bond”) of particleboards, fibreboards, and cement-bonded particleboards. 2 Normative references This European Standard incorporates by dated or undate
23、d 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 in
24、corporated 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 1: Sampling and cutting of test pieces
25、and expression of test results 1) . 3 Principle Determination of resistance to tension perpendicular to the surface of the test piece by submitting the latter to a uniformly distributed tensile force until rupture occurs. Tensile strength perpendicular to the plane of the board is determined by the
26、maximum load in relation to the surface area of the test piece. 4 Apparatus 4.1 Sliding calliper Sliding calliper according to EN325. 4.2 Testing machine Testing machine, capable of applying a tensile forceperpendicular to the surfaces of the test pieceby means of grips (Figure 1), and measuring thi
27、s forceto an accuracy of 1%. The grips shall be self-aligning by means of a ball-and-socket joint on both sides of the test piece. 4.3 Test blocks Test blocks (metal, hardwood or hardwood plywood), compatible with the fixing device, to which the test pieces are to be glued (Figure 1). 5 Test pieces
28、5.1 Sampling Sampling and cutting of the test pieces shall be carried out according to EN326-1. 5.2 Dimensions The test pieces shall be square with a side length of(50 1)mm. The test pieces shall be cut with precision, the angles shall be90 and the edges shallbe straight and clean. 5.3 Conditioning
29、The test pieces and the hardwood, or hardwood plywood, testing blocks shall be conditioned to constant mass in an atmosphere with a mean 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, carrie
30、d out at an interval of24h, do not differ by more than 0,1% of the mass of the test piece. In some cases, for instance in a cyclic test in humid conditions or in an immersion-in-water test, alternative conditioning procedures may be specified. In this case the appropriate standard shall be consulted
31、 and followed. 5.4 Determination of dimensions After conditioning, measure the length and width of each test piece according to EN325. 5.5 Bonding of the test pieces to the loading blocks Each test piece shall be bonded to loading blocks using a suitable adhesive. Excess glue pressed out from the gl
32、ueline shall be removed. If hot-melt glue is used, the screen side of hardboards shall be sanded off until a smooth surface is achieved. If the screen side is not sanded off, a gap-filling glue (epoxy glue) shall be used. When glueing, additional stresses affecting the test piece, by the moisture co
33、ntained in the adhesive and the rise in temperature, etc., shall be avoided as far as possible. NOTEThe following combinations have proved suitable: hot melt and epoxy glues with metal blocks; hot melt, epoxy, PVAC, UF, phenol-resorcinol glues with hardwood and hardwood-plywood blocks. Certain glues
34、 are not suitable for bonding test pieces which have been subjected to a cyclic test in humid conditions or an immersion-in-water test. If the test pieces are bonded to their loading blocks after such a pretreatment they may be lightly sanded top and bottom to remove any roughness which has occurred
35、 during pretreatment. 1) At present at the draft stage.EN319:1993 4 BSI 07-1999 Figure 1 Examples of apparatus for testing tensile strength perpendicular to the plane of the boardEN319:1993 BSI 07-1999 5 The tests shall not be carried out until the glue has had sufficient time to cure, so that the r
36、upture does not occur in the glueline, and until the test pieces have regained an equal distribution of moisture. By experience, approximately 24 h are sufficient if hot-melt or epoxy glues are used, and approximately72 h, if other glues are used. During this time, the glued assembly shall be stored
37、 under controlled conditions of (65 5) % relative humidity and a temperature of (20 2) C. Test pieces shall be tested not more than1hour after removal from the conditioning environment. Conditioning is not applicable to test pieces or glued assemblies which have been subjected to a cyclic test in hu
38、mid conditions or an immersion-in-water test and which are tested in the humid stage. NOTEWhen thin boards (800kg/m 3 ) are tested, it is recommended to use metal blocks, since experience has shown that the results are more variable with wooden blocks in these cases. 6 Procedure 6.1 Application of t
39、he load Place the testing assembly in the grips and apply a force until rupture occurs. The load shall be applied at a constant rate of crosshead-movement throughout the test. The rate of loading shall be adjusted so that the maximum load is reached within (60 30)s. 6.2 Measurement of failing load R
40、ecord the maximum load sustained by the test piece with a precision of1%. Reject the results from any test pieces that exhibit partial or total glueline failure or failure in the testing block. In this case, the test shall be repeated using new test pieces. 7 Expression of results 7.1 For a test pie
41、ce Tensile strength perpendicular to the plane of the board of each test piece, f t 8 , expressed in N/mm 2 to two decimals, is calculated according to the following formula: where: 7.2 For a board The transverse tensile strength of the board is the mean value of all results obtained from the test p
42、ieces from that board, expressed inN/mm 2to two decimals. 8 Test report According to EN326-1. F max is the breaking load, in Newtons; a, b is the length and width of the test piece, in millimetres. f t8 F max a b - =EN319:1993 6 BSI 07-1999 Annex A (informative) Bibliography EN 309, Wood particleboa
43、rds Definition and classification. EN 316, Wood fibreboards Definition, classification and symbols. EN 633, Cement-bonded particleboards Definition and classification 2) . 2) At present at the draft stage.BSEN319:1993 BSI 07-1999 National annex NA (informative) Committees responsible The UnitedKingd
44、om participation in the preparation of this European Standard was entrusted by the Technical Sector Board for Building and Civil. Engineering (B/-) to Technical CommitteeB/541, upon which the following bodies were represented: American Plywood Association Association of British Plywood and Veneer Ma
45、nufacturers British Woodworking Federation Chartered Institute of Building Coordinator for Timber and Timber Products Council of the Forest Industries of British Columbia Department of the Environment (Timber Division, Building Research Establishment) Fibre Building Board Organization (FIDOR) Finnis
46、h Plywood International Flat Roofing Contractors Advisory Board Forestry Commission Furniture Industry Research Association Institution of Structural Engineers National Federation of Roofing Contractors National Housebuilding Council National Panel Products Association Royal Institute of British Arc
47、hitects Timber Research and Development Association Timber Trade Federation United Kingdom and Ireland Particleboard Association Coopted member National annex NB (informative) Cross-reference Publication referred to Corresponding British Standard EN 325:1993 BS EN 325:1993 Wood-based panels Determin
48、ation of dimensions of test piecesBS EN 319:1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated
49、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 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 BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:
