1、BRITISH STANDARD BS EN 1128:1996 Cement-bonded particleboards Determination of hard body impact resistance The European Standard EN 1128:1995 has the status of a British Standard ICS 79.060.20BSEN1128:1996 This British Standard, having been prepared under the directionof the Sector Board forBuilding
2、 and Civil Engineering, was published underthe authority of the Standards Board and comesintoeffect on 15 May 1996 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 93/106771 DC ISBN 0 580 25342 2 Committees responsible for this
3、 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: A.P.A. (Engineered Wood Association) Association of British Plywood and Veneer Manufacturers British Woodworking Federation Char
4、tered Institute of Building Co-ordinator for Timber and Timber Products 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 Re
5、search 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 Associat
6、ion Timber Research and Development Association Timber Trade Federation Wood Panel Products Federation Zurich Municipal Building Guarantee Amendments issued since publication Amd. No. Date CommentsBSEN1128:1996 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword i
7、i Foreword 2 Text of EN 1128 3 List of references Inside back coverBSEN1128:1996 ii BSI 07-1999 National foreword This British Standard has been prepared by Technical Committee B/541 and is the English language version of EN 1128:1995 Cement-bonded particleboards Determination of hard body impact re
8、sistance, published by the European Committee for Standardization (CEN). EN 1128 was produced as a result of international discussions in which the UK took an active part. The principle of this method is technically equivalent to clause 21 of BS5669 Particleboard Part 1: Methods of sampling, conditi
9、oning and test, which will be withdrawn in accordance with CEN provisions within6months of the completion of the full package of standards covering particleboards and related test methods. These standards are: EN 1128 is part of a series of standards within the above package covering cement-bonded p
10、articleboards and related test methods. The series consists of: 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 f
11、rom legal obligations. EN 120 EN 311 EN 312-7 EN 326-1 EN 1328 EN 300 EN 312-1 EN 322 EN 633 EN 309 EN 312-2 EN 323 EN 634-1 EN 310 EN 312-3 EN 324-1 EN 634-2 EN 317 EN 312-5 EN 324-2 EN 1087-1 EN 319 EN 312-6 EN 325 EN 1128 EN 1328 EN 634-2 EN 324-2 EN 322 EN 1128 EN 633 EN 324-1 EN 310 EN 634-1 EN
12、 325 EN 323 Cross-reference Publication referred to Corresponding British Standard EN 326-1 BS EN 326 Wood-based panels Sampling, cutting and inspection Part 1:1994 Sampling and cutting of test pieces and expression of test results Summary of pages This document comprises a front cover, an inside fr
13、ont cover, pages i and ii, the EN 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 amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE E
14、UROPISCHE NORM EN 1128 October 1995 ICS 79.060.20 Descriptors: Particle boards, binders: materials, cements, thickness, tests, determination, shock resistance English version Cement-bonded particleboards Determination of hard body impact resistance Panneaux de particules lies au ciment Dtermination
15、de la rsistance au choc de corps dur Zementgebundene Spanplatten Bestimmung des Stowiderstandes mit einem harten Krper This European Standard was approved by CEN on 1995-09-18. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Eu
16、ropean 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 (Engli
17、sh, 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, Fi
18、nland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050
19、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 1128:1995 EEN1128:1995 BSI 07-1999 2 Foreword This European Standard has been prepared by the Technical Committee CEN/TC112, Wood-based panels, of whic
20、h the Secretariat is held by DIN. 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 April 1996, and conflicting national standards shall be withdrawn at the latest by April1996. According to the CEN
21、/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 the United Kingdom. Contents Page Forew
22、ord 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test pieces 3 6 Procedure 3 7 Expression of results 4 8 Test report 4 Annex A (informative) Bibliography 8 Figure 1 Example of impact test apparatus 5 Figure 2 Example of steel frame (cross-section) with clamped test piece 6 Figu
23、re 3 Example of steel collar showing approximate positions of clamping points 7 Figure 4 Point of impact for testing jointed test pieces 7EN1128:1995 BSI 07-1999 3 1 Scope This European Standard specifies a method of determining the hard body impact resistance of cement-bonded particleboards with a
24、nominal thickness equal to or greater than9mm. 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 hereafter. For dated
25、 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 326-1, Wood-based panels Sampling, cutting and i
26、nspection Part 1: Sampling and cutting of test pieces and expression of test results. 3 Principle The resistance to hard body impact is determined by the free dropping, from progressively increased heights, of a hard body with a defined mass onto a rigidly clamped test piece until the test piece is
27、penetrated or cracked. 4 Apparatus The apparatus shall comprise a frame which at its base will have means of clamping the test piece in a horizontal position, so that there is no possibility of vibration. This can be achieved using a collar which is clamped to the frame. When the test piece is clamp
28、ed the free distance between its underside and the bottom of the frame shall be at least 50mm. Thefree space between the supports shall be(290 5)mm. The upper part of the frame is provided with guides enabling the falling body fixed on a soft non-alloy steel rod to fall freely and vertically onto th
29、e centre of the test piece. The falling body shall have a hemispherical extremity with a radius of (25 0,5)mm and a mass(m) of (4,5 0,05)kg, including the associated parts. The frame or guide(s) should be marked at intervals of25mm to enable the height from which the body is dropped to be measured.
30、An example of the type of apparatus is given inFigure 1, Figure 2 andFigure 3. In Figure 1, the guides are fitted with ball bearings to ensure free fall. 5 Test pieces 5.1 Sampling and cutting Sampling and cutting of test pieces shall be carried out in accordance with EN326-1, with values ofm (test
31、pieces per panel) =4and n (panels) =5, i.e.20test pieces. 5.2 Dimensions of test pieces The test pieces shall be square with a side dimension of (310 5)mm. Where a jointed test piece is to be tested, it shall be assembled so that the point of impact will be on the grooved haft of the test piece and3
32、0mm from the joint line showing on the upper surface of the test piece as shown in Figure 4. Where the joint is glued, it should be allowed to cure before conditioning and testing. 5.3 Conditioning The test pieces shall be conditioned to constant mass in an atmosphere with a relative humidity of(65
33、5)% and a temperature of (20 2) C. NOTEConstant 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 than 0,1%of the mass of the test piece. 6 Procedure Position the test apparatus on a level, solid, rigid fl
34、oor, e.g. concrete. Clamp the test piece to the supporting frame so that it overlaps all four sides equally by not less than7mm (seeFigure 2). Raise the falling body25mm above the surface of the test piece and allow it to drop freely. The falling body or its guide rod, should be caught after impact
35、so that the falling body shall not bounce and strike the test piece a second time. Repeat this step, but increase the drop-height by25mm each time until the falling body either penetrates the test piece leaving a clearly visible hole, or leaves a series of cracks (see notes1and2). Record this height
36、. NOTE 1Penetration has occurred if, on removal of the test piece from the frame, light can been seen through it at any point around the hemispherical indentation produced by the falling body. NOTE 2Exceptionally, cracks can appear, radiating from the point of impact, before the test piece is penetr
37、ated. In this case, the drop-height that first produces such cracks is taken as the final measurement.EN1128:1995 4 BSI 07-1999 7 Expression of results The impact resistance IR of the test piece in millimetres per millimetre of thickness shall be calculated from the equation: where The result for ea
38、ch test piece, as well as the mean for the20test pieces, shall be expressed to two significant figures. 8 Test report This shall be as described in EN 326-1, including the type of failure. H is the drop-height required to produce failure of the test piece by penetration or cracking (in millimetres);
39、 t is the nominal thickness of the test piece (inmillimetres). IR H 25 t - =EN1128:1995 BSI 07-1999 5 Figure 1 Example of impact test apparatusEN1128:1995 6 BSI 07-1999 Figure 2 Example of steel frame (cross-section) with clamped test pieceEN1128:1995 BSI 07-1999 7 Figure 3 Example of steel collar s
40、howing approximate positions of clamping points Figure 4 Point of impact for testing jointed test piecesEN1128:1995 8 BSI 07-1999 Annex A (informative) Bibliography EN 325, Wood-based panels Determination of dimensions of test pieces. EN 633, Cement-bonded particleboards Definition and classificatio
41、n. EN 634-2, Cement-bonded particleboards Specifications Part 2: Requirements for OPC bonded particleboards for use in dry, humid and exterior conditions 1) . 1) At present at the draft stage.BSEN1128:1996 BSI 07-1999 List of references See national foreword.BS EN 1128:1996 BSI 389 Chiswick High Roa
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