1、December 2016 English price group 9No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 83.180!%hA“2596930www.din.deDIN
2、EN 205Adhesives Wood adhesives for nonstructural applications Determination of tensile shear strength of lap joints;English version EN 205:2016,English translation of DIN EN 205:2016-12Klebstoffe Holzklebstoffe fr nichttragende Anwendungen Bestimmung der Klebfestigkeit von Lngsklebungen im Zugversuc
3、h;Englische Fassung EN 205:2016,Englische bersetzung von DIN EN 205:2016-12Adhsifs Colles pour bois usages non structuraux Dtermination de la rsistance au cisaillement en traction des joints recouvrement;Version anglaise EN 205:2016,Traduction anglaise de DIN EN 205:2016-12SupersedesDIN EN 205:20030
4、6www.beuth.deDocument comprises 13 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.12.16 DIN EN 205:2016-12 2 A comma is used as the decimal marker. National foreword This document (EN 205:2016) has been prepared by Technical C
5、ommittee CEN/TC 193 “Adhesives” (Secretariat: AENOR, Spain). The responsible German body involved in its preparation was DIN-Normenausschuss Holzwirtschaft und Mbel (DIN Standards Committee Timber and Furniture), Working Committee NA 042-04-05 AA Spiegelausschuss zu CEN/TC 193/SC 1 Holzklebung. The
6、DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 6344-2 DIN ISO 6344-2 Amendments This standard differs from DIN EN 205:2003-06 as follows: a) the assessment of the strength based on thick bond lines has been deleted; b) processing conditions f
7、or adhesive applications have been specified in Subclause 6.1 for cases where no manufacturers instructions are available; c) in Subclause 6.3, the number of test pieces has been changed; d) test results of all 20 test pieces are now to be given in the test report. Previous editions DIN 53254: 1954-
8、03, 1964-06, 1980-01, 1987-01 DIN 68603: 1974-02 DIN EN 205: 1991-10, 2003-06 National Annex NA (informative) Bibliography DIN ISO 6344-2, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P 12 to P 220 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NO
9、RM EN 205 August 2016 ICS 83.180 Supersedes EN 205:2003English Version Adhesives - Wood adhesives for non-structural applications - Determination of tensile shear strength of lap joints Adhsifs - Colles pour bois usages non structuraux - Dtermination de la rsistance au cisaillement en traction des j
10、oints recouvrement Klebstoffe - Holzklebstoffe fr nichttragende Anwendungen - Bestimmung der Klebfestigkeit von Lngsklebungen im Zugversuch This European Standard was approved by CEN on 8 July 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditi
11、ons 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists i
12、n 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standar
13、ds bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slove
14、nia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved
15、worldwide for CEN national Members. Ref. No. EN 205:2016 EEN 205:2016 (E) 2 Contents Page European foreword . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Terms and definitions . 5 4 Principle . 5 5 Apparatus . 5 6 Procedure. 5 6.1 Preparation of bonded assemblies . 5 6.2 Preparation of tes
16、t pieces 8 6.3 Number of test pieces 8 6.4 Treatment prior to tensile shear testing 9 6.5 Tensile shear test 9 7 Expression of results 9 8 Test report . 9 Annex A (informative) Single lap joint test pieces 11 DIN EN 205:2016-12 EN 205:2016 (E) 3 European foreword This document (EN 205:2016) has been
17、 prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. 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 February 2017, and conflicting national standard
18、s shall be withdrawn at the latest by February 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 205:2003. Compared t
19、o EN 205:2003 the following modifications have been made: a) assessment of the strength based on thick bond lines deleted; b) processing conditions for adhesive application specified in 6.1 if no manufacturers instructions are available; c) number of test pieces modified in 6.3; d) test results of a
20、ll 20 test pieces to be given in the test report. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland,
21、Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 205:2016-12 EN 205:2016 (E) 4
22、Introduction European Standards giving a common classification with respect to durability classes for wood adhesives will allow considerable improvement in consumer protection in any future product liability system with regard to properties guaranteed by the adhesive manufacturer. The methods descri
23、bed in this standard are suitable for the following and other applications: assessing the usability and quality of adhesives for wood and derived timber products; classifying these adhesives into the durability classes D1 to D4 of EN 204 (thermoplastic adhesives) and C1 to C4 of EN 12765 (thermosett
24、ing adhesives); assessing effects on the bond strength resulting from the bonding conditions chosen, the various conditioning sequences and the treatment of the test pieces before and after bonding. SAFETY STATEMENT Persons using this document should be familiar with the normal laboratory practice,
25、if applicable. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. ENVIRONMENTAL STATEMENT It is under
26、stood that some of the material permitted in this standard may have negative environmental impact. As technological advantages lead to acceptable alternatives for these materials, they will be eliminated from this standard to the extent possible. At the end of the test, it is essential that the user
27、 of the standard take care to carry out an appropriate disposal of the wastes, according to local regulation DIN EN 205:2016-12 EN 205:2016 (E) 5 1 Scope This European Standard specifies tests for adhesives for wood and derived timber products for the assessment of their resistance to hot and cold w
28、ater. It can be used for the assessment of the strength of bonds with a thin bond-line. It does not apply to adhesives for structural use or to the manufacture of particleboards, fibreboards and plywood. It does not replace tests on finished products. 2 Normative references The following documents,
29、in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 204, Classification of thermo
30、plastic wood adhesives for non-structural applications EN 923, Adhesives - Terms and definitions EN 12765, Classification of thermosetting wood adhesives for non-structural applications ISO 5893, Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) S
31、pecification ISO 6344-2:1998, Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P12 to P220 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923 and the following apply. 3.1 thin bond line close contact
32、 adhesive joint where the adhesive layer is nominally 0,1 mm thick 4 Principle A symmetrical bonded single lap joint between two symmetrical wooden adherends is subjected to specified conditioning treatments and strained to rupture by a tensile force parallel to the grain. 5 Apparatus The testing ma
33、chine shall be a constant-rate-of-traverse machine as described in ISO 5893. If a constant-rate-of-traverse machine is not available, a constant-rate-of-loading machine shall be used causing a rupture within the time limits specified in 6.5. The jaws shall grip the test pieces with a wedge action an
34、d permit self-alignment while the test pieces are being pulled. 6 Procedure 6.1 Preparation of bonded assemblies Prepare two panels (see Figure 1) from a thick unsteamed, conditioned, straight-grained board of beech (Fagus sylvatica L.) with a nominal density of (700 50) kg/m3 with a moisture conten
35、t of (12 1) %. DIN EN 205:2016-12 EN 205:2016 (E) 6 It is permissible to prepare panels from different boards unless it is essential to minimize differences in the wood in order to conduct special comparative tests. Ensure that the angle between the growth rings and the surface to be bonded is betwe
36、en 30 and 90. Cut the panels across the direction of the grain to a length equal to a multiple of 300 mm with the necessary allowance for cross-cutting and along the grain to a width of approximately 130 mm making an allowance for the width of cut as shown in Figure 1. For tests use two panels of (5
37、,0 0,1) mm thickness. For conventional tests, condition the panels at a temperature of either (20 2) C and (65 5) % relative humidity or (23 2) C and (50 5) % relative humidity subsequently referred to as the standard atmosphere (20/65) or (23/50) for a minimum of 7 days. Prepare bonded assemblies u
38、sing thin (approximately 0,1 mm) bond-lines. Not more than 24 h before bonding, either lightly plane or lightly sand each surface to be bonded (using an abrasive paper of grain size P100 complying with ISO 6344-2:1998 is recommended). Remove any dust carefully. Do not touch or soil the prepared surf
39、aces. Comply with the adhesive manufacturers instructions regarding the processing conditions, including the preparation of the adhesive, the amount of adhesive to be applied, whether the adhesive is to be applied on one or both surfaces, the open and closed assembly time and the magnitude and durat
40、ion of the assembly pressure and report them in the test report. Where no manufacturers instructions are available the following processing conditions shall be used: adhesive applied on both sides; adhesive spread: (150 10) g/m2; open assembly time: (120 10) s; closed assembly time (180 10) s; press
41、ing pressure (0,7 0,1) N/mm2; pressing time: 2 h; Bond the two 5 mm thick panels as shown in Figure 1 with the pressure uniformly distributed over the bonded surface. DIN EN 205:2016-12 EN 205:2016 (E) 7 Dimensions in millimetres Key l1(150 5) mm: length of test piece b (20,0 0,2) mm: width of test
42、piece s (5,0 0,1) mm: thickness of the panels Figure 1 Example of a bonded panel marked for division into individual test pieces using 2,5 mm saw cuts DIN EN 205:2016-12 EN 205:2016 (E) 8 6.2 Preparation of test pieces After pressing condition the assembly for 7 days in standard atmosphere. A longer
43、 conditioning time may be used if recommended by the adhesive manufacturer. The test pieces shall not be cut earlier than 5 days after bonding. Cut five strips of width b = (20 0,2) mm from each bonded assembly along the grain, avoiding areas within 7,5 mm of the outside long edges of the panel as s
44、hown in Figure 1. Cut these strips into test pieces of length l1= (150 5) mm as shown in Figure 2. Make flat bottomed cuts of (2,5 0,5) mm wide in the bonded sections across the grain so that an overlap of length l2= (10,0 0,2) mm is defined in the middle section (see Figure 2). The cuts are to sepa
45、rate the wood layers. Take care that the cuts completely cut through the bond line but only penetrate as little as possible into the other part of the joint. Key l1(150 5) mm: total length of test piece s (5,0 0,1) mm: thickness of the panels b (20,0 0,2) mm: width of test piece (width of tested sur
46、face) 30 to 90: angle between growth ring and surfaces to be bonded l2(10,0 0,2) mm: length of overlap (length of tested surface) Figure 2 Lap joint test pieces with a thin bond line 6.3 Number of test pieces Test 20 test pieces for each of the conditioning sequences chosen. DIN EN 205:2016-12 EN 20
47、5:2016 (E) 9 6.4 Treatment prior to tensile shear testing Subject the test pieces from conditioned bonded assemblies as in 6.2 to the appropriate conditioning sequences. Ensure that the test pieces are in a horizontal plane, not touching each other and are supported in such a way that no stress is a
48、pplied to them. NOTE For classifying an adhesive in accordance with EN 204:2016, or EN 12765:2016, the appropriate conditioning sequences are given in Table 2 of these standards. 6.5 Tensile shear test Test the test pieces shown in Figures 2 and A.1 in a tensile testing machine. Clamp the ends of th
49、e test pieces in the jaws of the tensile testing machine up to a length of 40 mm to 50 mm. Ensure that the force is applied centrally and in the plane of the bond. Load the test piece until rupture. Record the applied maximum force Fmaxin newtons (N). For comparative tests of adhesives and for assigning an adhesive to the durability classes specified in EN 204 or EN 12765 conduct the
