1、BS EN 15416-4:2017Adhesives for load bearingtimber structures other thanphenolic and aminoplastic Test methodsPart 4: Determination of open assemblytime under referenced conditionsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 15416-4:2017 BRITISH STANDARDNati
2、onal forewordThis British Standard is the UK implementation of EN 15416-4:2017. It supersedes BS EN 15416-4:2006 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives.A list of organizations represented on this committee can be obtained on
3、request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 85716 4 ICS 83.180 Compliance with a Briti
4、sh Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 15416-4:2017EUROPEAN STANDARD NORME EURO
5、PENNE EUROPISCHE NORM EN 15416-4 January 2017 ICS 83.180 Supersedes EN 15416-4:2006English Version Adhesives for load bearing timber structures other than phenolic and aminoplastic - Test methods - Part 4: Determination of open assembly time under referenced conditions Adhsifs pour structures portan
6、tes en bois de type autre que phnolique et aminoplaste - Mthodes dessais - Partie 4 : Dtermination du temps dassemblage ouvert dans des conditions de rfrenceKlebstoffe fr tragende Holzbauteile ausgenommen Phenolharzklebstoffe und Aminoplaste - Prfverfahren - Teil 4: Bestimmung der offenen Wartezeit
7、bei Referenzbedingungen This European Standard was approved by CEN on 30 October 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 alteration. Up-to-date lists
8、 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 made by translation under t
9、he 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, Estonia, Finland, Former Yugo
10、slav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT
11、 EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15416-4:2017 EBS EN 15416-4:2017EN 15416-4:2017 (E) 2 Co
12、ntents Page European foreword . 3 Introduction 5 1 Scope 6 2 Normative references 6 3 Terms and definitions . 6 4 Principle . 6 5 Apparatus . 6 6 Procedure. 7 6.1 General 7 6.2 Preparation of bonded assemblies . 7 6.3 Preparation of samples for testing . 8 6.4 Test procedure . 8 7 Expression of resu
13、lts 8 7.1 Tensile shear strength . 8 7.2 Failure mode . 8 8 Requirement . 8 9 Test report . 8 9.1 General information . 8 9.2 Information about the adhesive 9 9.3 Preparation of test pieces and testing procedure . 9 9.4 Test results 9 BS EN 15416-4:2017EN 15416-4:2017 (E) 3 European foreword This do
14、cument (EN 15416-4:2017) has been 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 July 2017, and
15、conflicting national standards shall be withdrawn at the latest by July 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 supersede
16、s EN 15416-4:2006. Compared to EN 15416-4:2006, the following main modifications have been made: a) title has been changed; b) 7.2 covering failure mode has been introduced; c) new definition of open assembly time has been given in 3.1; d) time intervals for open assembly times in Table 1 divided in
17、to slow and fast systems; e) requirement has been added as Clause 8. This document is one of a series dealing with adhesives for use with timber structures, and is published in support of product standards for bonded load-bearing timber structures. The series consists of three classification and per
18、formance requirements for adhesives for load-bearing timber structures, phenolic and aminoplastic adhesives (EN 301), one component polyurethane adhesives (EN 15425) and emulsion polymerized isocyanate adhesives (EN 16254), together with 12 test methods (EN 302 Parts 1 to 8 and EN 15416 Parts 1 and
19、3 to 5). These European Standards have the following titles: EN 301, Adhesives, phenolic and aminoplastic, for load-bearing timber structures Classification and performance requirements EN 15425, Adhesives One component polyurethane (PUR) for load-bearing timber structures Classification and perform
20、ance requirements EN 16254, Adhesives Emulsion polymerized isocyanate (EPI) for load-bearing timber structures Classification and performance requirements EN 302-1, Adhesives for load-bearing timber structures Test methods Part 1: Determination of longitudinal tensile shear strength EN 302-2, Adhesi
21、ves for load-bearing timber structures Test methods Part 2: Determination of resistance to delamination EN 302-3, Adhesives for load-bearing timber structures Test methods Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile
22、strength BS EN 15416-4:2017EN 15416-4:2017 (E) 4 EN 302-4, Adhesives for load-bearing timber structures Test methods Part 4: Determination of the effects of wood shrinkage on the shear strength EN 302-5, Adhesives for load-bearing timber structures Test methods Part 5: Determination of maximum assem
23、bly time under referenced conditions EN 302-6, Adhesives for load-bearing timber structures Test methods Part 6: Determination of the minimum pressing time under referenced conditions EN 302-7, Adhesives for load-bearing timber structures Test methods - Part 7: Determination of the working life unde
24、r referenced conditions EN 302-8, Adhesives for load-bearing timber structures Test methods Part 8: Static load test of multiple bond line specimens in compression shear EN 15416-1, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 1: Long-term tensi
25、on load test perpendicular to the bond line at varying climate conditions with specimens perpendicular to the glue line (Glass house test) EN 15416-3, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 3: Creep deformation test at cyclic climate condi
26、tions with specimens loaded in bending shear EN 15416-4, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 4: Determination of open assembly time under referenced conditions EN 15416-5, Adhesives for load bearing timber structures other than phenolic
27、 and aminoplastic Test methods Part 5: Determination of minimum pressing time under referenced conditions 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, Croa
28、tia, 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turk
29、ey and the United Kingdom. BS EN 15416-4:2017EN 15416-4:2017 (E) 5 Introduction Safety statement Persons using this European Standard should be familiar with the normal laboratory practice, if applicable. This European Standard cannot address all of the safety problems, if any, associated with its u
30、se. 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 European Standard may have negative environmental impact. As tec
31、hnological advantages lead to better alternatives for these materials, they will be eliminated from this European Standard to the extent possible. At the end of the test, it is recommended that the user of this European Standard take care to carry out an appropriate disposal of the wastes, according
32、 to local regulation. BS EN 15416-4:2017EN 15416-4:2017 (E) 6 1 Scope This European Standard specifies a laboratory method of determining the open assembly time in standard climate (20 2) C and (65 5) % relative humidity (hereafter climate 20/65). This European Standard is intended to determine the
33、open assembly time using a defined procedure for obtaining a reliable base for comparison of open assembly time between adhesives under referenced conditions. The method gives a result that cannot be applied to the safe manufacture of timber structures without taking into account the influence of fa
34、ctors such as timber density, moisture content, factory temperature and relative air humidity. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited appl
35、ies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 302-1:2013, Adhesives for load-bearing timber structures Test methods Part 1: Determination of longitudinal tensile shear strength EN 923:2015, Adhesives Terms and definitions ISO 5893,
36、Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Specification ISO 6344-2, 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,
37、the terms and definitions given in EN 923:2015 and the following apply. 3.1 open assembly time time interval under specified conditions from adhesive spread until the surfaces to be bonded are joined 4 Principle Standard beech lap joints are tested in tensile shear after various open assembly times
38、until it is found that the shear strength value is below 10 N/mm2, the coefficient of variation increases considerably or the failure mode changes considerably. 5 Apparatus The testing machine shall be a) either capable of maintaining a constant rate of loading of (2,0 0,5) kN/min, b) or capable of
39、maintaining constant crosshead speed as described in ISO 5893. BS EN 15416-4:2017EN 15416-4:2017 (E) 7 The jaws of the testing machine shall grip the test pieces firmly and prevent slippage during loading. The grip shall be fixed in hinged manner. 6 Procedure 6.1 General Sufficient beech panels shal
40、l be prepared to enable manufacturing of 6 sets each of at least 10 test specimens with close contact glue lines as specified in EN 302-1:2013, Clause 7. 6.2 Preparation of bonded assemblies After conditioning to (12 1) % moisture content in climate 20/65, the panels shall be divided into 6 equal gr
41、oups of samples, one for each of the 6 test series given in Table 1. Table 1 Example of time intervals for open assembly times at 20 C and 65 % RH Test series (nr) 1 2 3 4 5 6 Open assembly time for slow systems (min) 40 50 60 70 80 90 Open assembly time for fast systems (min) 1 2 3 4 5 6 EXAMPLE If
42、 the expected open assembly time is 70 min, use the time intervals for slow systems. If the expected open assembly time is 4 min, use the time intervals for fast systems. If the expected open assembly time does not fit the examples given in Table 1, adjust the intervals in a similar manner and accor
43、ding to the adhesive manufacturer recommendation. The adjustment shall be such that at least a total of 6 test series covering the time range below and over the expected open assembly time is tested. Not more than 24 h before bonding either lightly plane or lightly sand each surface (using an abrasi
44、ve paper of grain size P100 as defined in ISO 6344-2) to be bonded. Remove any dust carefully. Do not touch or soil the prepared surfaces. An adhesive spread of 200 g/m2on one side only shall be used unless another amount is requested by the manufacturer. Comply with the adhesive manufacturers instr
45、uctions regarding the processing conditions, including the preparation and application of the adhesive and report them in the test report. After adhesive application, the boards are open assembled with the chosen times in climate (20 1) C and (65 5) % relative humidity before bonded together. A stri
46、ct climate control is very important as small changes in air temperature and relative humidity will influence the drying tendency of the applied adhesive and thus influence the open assembly time. The circulation of air should be as low as possible. Before pressure application, the boards shall be l
47、aid together as shown in EN 302-1:2013, Figure 2, ensuring that the matching boards are used to produce the bonded assembly joint. BS EN 15416-4:2017EN 15416-4:2017 (E) 8 6.3 Preparation of samples for testing After bonding and pressing, and before testing, conditioning the assembly for 7 days to 14
48、 days in climate 20/65. The test pieces shall be cut from the bonded panels according to EN 302-1:2013, 7.3. Before testing, measure and record the glue line thickness in all test pieces in each test set. The glue line thickness shall be checked with a magnifying glass with which the glue line thick
49、ness can be determined with an accuracy of 10 %. For a spread rate of 200 g/m2, allow a maximum glue line thickness of 0,2 mm. 6.4 Test procedure The test specimens shall be tested according to EN 302-1:2013, 7.6. Test a sufficient number of test pieces to provide 10 valid results for each of the chosen open assembly time. Stop the testing after the first 10 valid results. Results from tests in which failure occurred in the wood at values below 10 N/mm
