1、BS EN 205:2016Adhesives Wood adhesivesfor non-structural applications Determination of tensileshear strength of lap jointsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 205:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of
2、 EN 205:2016. Itsupersedes BS EN 205:2003 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all
3、 the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 89030 7ICS 83.180Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standar
4、d was published under the authority of theStandards Policy and Strategy Committee on 31 August 2016.Amendments issued since publicationDate Text affectedBS EN 205:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 205 August 2016 ICS 83.180 Supersedes EN 205:2003English Version Adhesives - Woo
5、d 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 joints recouvrement Klebstoffe - Holzklebstoffe fr nicht tragende Anwendungen - Bestimm
6、ung 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 conditions for giving this European Standard the status of a national standard without any a
7、lteration. 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 in three official versions (English, French, German). A version in any other language
8、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 standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Es
9、tonia, Finland, 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 United Kingdom. EUROPEAN COMMITTEE FOR ST
10、ANDARDIZATION 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 worldwide for CEN national Members. Ref. No. EN 205:2016 EBS EN 205:2016EN 205:2016 (
11、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 test pieces 8 6.3 Number of test pieces 8 6.4 Treatment prior to tensile s
12、hear 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 BS EN 205:2016EN 205:2016 (E) 3 European foreword This document (EN 205:2016) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of
13、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 standards shall be withdrawn at the latest by February 2017. Attention is drawn to t
14、he 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 to EN 205:2003 the following modifications have been made: a) assessment of t
15、he 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 all 20 test pieces to be given in the test report. According to the CEN-CENEL
16、EC 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Ice
17、land, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 205:2016EN 205:2016 (E) 4 Introduction European Standards giving a common classification with respect to du
18、rability 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 described in this standard are suitable for the following and other applications: asses
19、sing 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 (thermosetting adhesives); assessing effects on the bond strength resulting from the bonding
20、 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, if applicable. This document does not purport to address all of the safety proble
21、ms, 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 understood that some of the material permitted in this standard may have negative envi
22、ronmental 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 of the standard take care to carry out an appropriate disposal of the wastes, ac
23、cording to local regulation BS EN 205:2016EN 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 water. It can be used for the assessment of the strength of bonds with a thin bond-line
24、. 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, in whole or in part, are normatively referenced in this document and are indispensable
25、 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 thermoplastic wood adhesives for non-structural applications EN 923, Adhesives - Terms and d
26、efinitions 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) Specification ISO 6344-2:1998, Coated abrasives Grain size analysis Part 2: Determinati
27、on 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 adhesive joint where the adhesive layer is nominally 0,1 mm thick 4 Principle A symme
28、trical 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 machine shall be a constant-rate-of-traverse machine as described in ISO 5893. If a cons
29、tant-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 and permit self-alignment while the test pieces are being pulled. 6 Procedure 6.1 Prepar
30、ation 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 content of (12 1) %. BS EN 205:2016EN 205:2016 (E) 6 It is permissible to prepare panels fro
31、m 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 between 30 and 90. Cut the panels across the direction of the grain to a length equal to a multi
32、ple 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 (5,0 0,1) mm thickness. For conventional tests, condition the panels at a temperature of eith
33、er (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 using thin (approximately 0,1 mm) bond-lines. Not more than 24 h before bonding, either ligh
34、tly 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 surfaces. Comply with the adhesive manufacturers instructions regarding the processing conditio
35、ns, 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 duration of the assembly pressure and report them in the test report. Where no manufacturers ins
36、tructions 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; pressing pressure (0,7 0,1) N/mm2; pressing time: 2 h; Bond the two 5 mm thick panels as shown i
37、n Figure 1 with the pressure uniformly distributed over the bonded surface. BS EN 205:2016EN 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 piece s (5,0 0,1) mm: thickness of the panels Figure 1 Example of a bonded panel marked for divi
38、sion into individual test pieces using 2,5 mm saw cuts BS EN 205:2016EN 205:2016 (E) 8 6.2 Preparation of test pieces After pressing condition the assembly for 7 days in standard atmosphere. A longer conditioning time may be used if recommended by the adhesive manufacturer. The test pieces shall not
39、 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 shown in Figure 1. Cut these strips into test pieces of length l1= (150 5) mm as shown in Figure 2. Ma
40、ke 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 separate the wood layers. Take care that the cuts completely cut through the bond line but only penetrate
41、 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 surface) 30 to 90: angle between growth ring and surfaces to be bonded l2(10,0 0,2) mm: length of overla
42、p (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. BS EN 205:2016EN 205:2016 (E) 9 6.4 Treatment prior to tensile shear testing Subject the test pieces from conditioned bonded
43、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 applied to them. NOTE For classifying an adhesive in accordance with EN 204:2016, or EN 12765:2016, the app
44、ropriate 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 the test pieces in the jaws of the tensile testing machine up to a length of 40 mm to 50 mm. Ensure that the
45、 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 test at a rate of t
46、raverse of approximately 50 mm/min for thermoplastic adhesives (EN 204) or 6 mm/min to12 mm/min for thermosetting adhesives (EN 12765) respectively. If a constant-rate-of-traverse machine is not available a constant-rate-of-loading machine shall be used causing a rupture after 5 s to 15 s for thermo
47、plastic adhesives (EN 204) and 30 s to 60 s for thermosetting glues (EN 12765). 7 Expression of results Calculate the strength in Newtons per square millimetre (N/mm2) using Formula (1). = =2max maxFFA lb(1) where Fmaxthe applied maximum force in Newtons (N); A the bonded test surface in square mill
48、imetres (mm2); l2the length of the bonded test surface in millimetres (mm); b the width of the bonded test surface in millimetres (mm). 8 Test report The following items shall be reported: a) Data about the adhesive: 1) type and origin of the adhesive; 2) batch number or other marking of uniquely id
49、entifying the adhesive used; BS EN 205:2016EN 205:2016 (E) 10 3) number of components and working methods (procedure of preparing and applying of adhesive); 4) durability class (for information only); b) Preparation of the test pieces and testing: 1) species of wood with botanical name; 2) moisture content of wood relative to oven-dry mass; 3) characteristic data relating to the bonding procedure (for instance information about the amount of adhesive applied, the open and closed
