DIN EN 302-6-2013 Adhesives for load-bearing timber structures - Test methods - Part 6 Determination of the minimum pressing time under referenced conditions German version EN 302-.pdf

1、June 2013 Translation by DIN-Sprachendienst.English price group 7No 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

2、.180!%3t“2021681www.din.deDDIN EN 302-6Adhesives for load-bearing timber structures Test methods Part 6: Determination of the minimum pressing time under referencedconditions;English version EN 302-6:2013,English translation of DIN EN 302-6:2013-06Klebstoffe fr tragende Holzbauteile Prfverfahren Tei

3、l 6: Bestimmung der Mindestpresszeit bei Referenzbedingungen;Englische Fassung EN 302-6:2013,Englische bersetzung von DIN EN 302-6:2013-06Adhsifs pour structures portantes en bois Mthodes dessai Partie 6: Dtermination du temps de serrage minimum dans des conditions de rfrence;Version anglaise EN 302

4、-6:2013,Traduction anglaise de DIN EN 302-6:2013-06SupersedesDIN EN 302-6:2004-10www.beuth.deDocument comprises 10 pagesIn case of doubt, the German-language original shall be considered authoritative.06.13DIN EN 302-6:2013-06 2 A comma is used as the decimal marker. National foreword This document

5、(EN 302-6:2013) has been prepared by Technical Committee CEN/TC 193 “Adhesives” (Secretariat: AENOR, Spain). The responsible German body involved in its preparation was the Normenausschuss Holzwirtschaft und Mbel (Timber and Furniture Standards Committee), Working Committee NA 042-04-05 AA Spiegelau

6、sschuss zu CEN/TC 193/SC 1 Holzklebung. Amendments This standard differs from DIN EN 302-6:2004-10 as follows: a) the title of the standard has been modified; b) the glue line thickness of 0,2 mm has been replaced by close contact glue line and 0,3 mm thick glue line; c) Subclause 5.2 “Testing machi

7、ne” has been included; d) the pressing times to be used in the test are linked to the reactivity of the adhesive. Previous editions DIN 68141: 1969-10, 1995-08 DIN EN 302-6: 2004-10 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 302-6 March 2013 ICS 83.180 Supersedes EN 302-6:2004English Versi

8、on Adhesives for load-bearing timber structures - Test methods - Part 6: Determination of the minimum pressing time under referenced conditions Adhsifs pour structures portantes en bois - Mthodes dessai - Partie 6: Dtermination du temps de serrage minimum dans des conditions de rfrence Klebstoffe fr

9、 tragende Holzbauteile - Prfverfahren - Teil 6: Bestimmung der Mindestpresszeit bei Referenzbedingungen This European Standard was approved by CEN on 5 February 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Sta

10、ndard 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 in three official versions (Engli

11、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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, B

12、ulgaria, 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, Slovenia, Spain, Sweden, Switzerland,

13、 Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.

14、 EN 302-6:2013: EEN 302-6:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 6 2 Normative references 6 3 Terms and definitions .6 4 Principle 6 5 Apparatus .6 6 Procedure .7 7 Test report 8 DIN EN 302-6:2013-06 EN 302-6:2013 (E) 3 Foreword This document (EN 302-6:2013) has been prepared by

15、 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 September 2013 and conflicting national standards shall be w

16、ithdrawn at the latest by September 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 302-6:2004. The

17、following modifications have been made: The pressing times are determined for both close contact glue line and 0,3 mm thick glue line; The pressing times to be used in the test are linked to the reactivity of the adhesive. According to the CEN-CENELEC Internal Regulations, the national standards org

18、anizations 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, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg

19、, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 302-6:2013-06 EN 302-6:2013 (E) 4 Introduction This document is one of a series dealing with adhesives for use with timber structures, and is published in su

20、pport of EN 1995, Eurocode 5: Design of timber structures. The series consists of three classification and performance requirements for adhesives for load-bearing timber structures; phenolic and aminoplastic adhesives (EN 301), one component polyurethane adhesive (EN 15425) and emulsion polymerized

21、isocyanate adhesive (prEN 16254) and all together eleven test methods (EN 302 Parts 1 to 7 and EN 15416 Parts 2 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 1

22、5425, Adhesives One component polyurethane for load-bearing timber structures Classification and performance requirements prEN 16254, Adhesives Emulsion polymerized isocyanate (EPI), for load-bearing timber structures Classification and performance requirement EN 302, Adhesives for load-bearing timb

23、er structures Test methods Part 1: Determination of longitudinal tensile shear strength Part 2: Determination of resistance to delamination Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cycling on the transverse tensile strength Part 4: Determination o

24、f the effects of wood shrinkage on the shear strength Part 5: Determination of maximum assembly time under referenced conditions Part 6: Determination of the minimum pressing time under referenced conditions Part 7: Determination of the working life under referenced conditions EN 15416, Adhesives fo

25、r load bearing timber structures other than phenolic and aminoplastic Test methods Part 2: Static load test of multiple bondline specimens in compression shear Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear Part 4: Determination of open assembly ti

26、me for one component polyurethane adhesives Part 5: Determination of conventional pressing time Safety statement Persons using this document should be familiar with the normal laboratory practice, if applicable. This document cannot address all of the safety problems, if any, associated with its use

27、. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. DIN EN 302-6:2013-06 EN 302-6:2013 (E) 5 Environmental statement It is understood that some of the material permitted in this standard can have a negat

28、ive environmental impact. As technological advantages lead to better alternatives for these materials, they will be eliminated from this standard to the greatest extent possible. At the end of the test, it is recommended that the user of the standard take care to carry out an appropriate disposal of

29、 the wastes, according to local regulations. DIN EN 302-6:2013-06 EN 302-6:2013 (E) 6 1 Scope This European Standard specifies a method of determining the minimum pressing time for two glue line thicknesses, close contact glue line and 0,3 mm thick glue line (for gap filling adhesive 1,0 mm), at thr

30、ee temperatures. It is applicable to adhesives used in load- bearing timber structures. This European Standard is only intended for obtaining a reliable base of comparison of pressing time between adhesives. The method gives results that cannot be applied to the safe manufacture of timber structures

31、 without modifications for the influences of timber density/absorbency, 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 dat

32、ed references, only the edition cited applies. 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 923:2005+A

33、1:2008, Adhesives Terms and definitions ISO 5893, Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Specification 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008, EN 302-1:2013 and

34、the following apply. 3.1 pressing time time for which an adhesive joint is pressed 3.2 minimum pressing time shortest pressing time (expressed as the mean of 10 individual results) that gives tensile shear strength of at least 4 N/mm at a given temperature under the referenced conditions 4 Principle

35、 Standard beech lap joints are tested in tensile shear after various curing times until it is found that the strength has reached a value of 4 N/mm. 5 Apparatus 5.1 Temperature cabinets, which shall be: capable of maintaining the air at a temperature of (15 2) C; capable of maintaining the air at a

36、temperature of (20 2) C; DIN EN 302-6:2013-06 EN 302-6:2013 (E) 7 capable of maintaining the air at a temperature of (30 2) C. 5.2 Testing machine, which shall be either: a) capable of maintaining a constant rate of loading of (2,0 0,5) kN/min; or b) capable of maintaining constant crosshead speed a

37、s described in ISO 5893. 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 Sufficient beech panels shall be prepared in accordance with EN 302-1:2013, 7.1. The panels shall enable the manuf

38、acturing of at least twelve bonded assemblies (each for ten test pieces), six bonded assemblies for close contact glue line and six bonded assemblies for 0,3 mm thick glue line (1,0 mm for gap filling adhesive). For very fast setting adhesives and close contact glue line, individual single lap joint

39、 test pieces (EN 302-1:2013, Figure 3) may be prepared for the bonding and the performance of the test. 6.2 After conditioning to (12 1) % moisture content, the panels shall be lightly planed or lightly sanded before being divided into equal groups for the three temperatures to be tested and wrapped

40、 air-tightly to prevent further change in moisture content. Each group of the panels or a sufficient number of prepared individual test pieces shall be transferred to one of the test temperatures described in 5.1. 6.3 After at least 12 h conditioning in the test temperature, the panels or the indivi

41、dual test pieces shall be glued and pressed using glue spread of 325 g/m (double sided application), and pour additional adhesive into the grooves of the grooved panel. The open and closed assembly time shall be as recommended by the adhesive manufacturer, but the total assembly time shall not excee

42、d 10 min. If the adhesive manufacturer wants to test at a lower spread rate, an additional test may be performed using a glue spread of 250 g/m (single sided application), with maximum 5 min assembly time. The test pieces shall not be removed from the test temperature during the pressing period. Unl

43、ess otherwise stated by the manufacturer, the clamping pressure shall be 0,8 N/mm. For each of the three test temperatures, two pressing times shall be chosen. One pressing time shall give a tensile shear strength below 4 N/mm2and one above 4 N/mm2. If this is not achieved, conduct new tests with sh

44、orter or longer pressing times. It is a common practice before bonding is started to store overnight the adhesive components and the timber at the specified temperature whereby the timber shall be packaged hermetically (air-tight) to prevent changes of moisture content. NOTE Because wood temperature

45、 is difficult to measure, it is a common practice to remove the test pieces from the conditioning cabinet immediately before applying the adhesive to them. 6.4 Immediately after the pressing time has elapsed, the panels shall be unclamped and ten test specimens cut from each of the bonded panels acc

46、ording to EN 302-1:2013, 7.2. They shall be tested according to EN 302-1:2013, 7.6 without delay. The time from unclamping to testing shall not be longer than 10 % of the clamping time. If this is not achieved for short clamping times, then use smaller beech panels than described in 6.1 and prepare

47、less than ten test pieces each time or use individual test pieces as described in 6.1. 6.5 The minimum pressing time shall be calculated by linear interpolation of those pressing times and their related tensile shear strengths which are most near to the time corresponding to a tensile shear strength

48、 4 N/mm. The calculated minimum pressing time shall be expressed to the nearest 5 min (for under 1 h), to the nearest 10 min (for between 1 h and 2 h) and to the nearest 15 min (for longer than 2 h), rounded off to the next higher value. DIN EN 302-6:2013-06 EN 302-6:2013 (E) 8 EXAMPLE A pressing ti

49、me of 4 h gives mean tensile shear strength of 3 N/mm; the mean tensile shear strength for 8 h pressing time is 6 N/mm. The result of the linear interpolation for 4 N/mm is 5 h 20 min. This calculated value would be rounded off to 5 h 30 min. 7 Test report The test report shall contain the following information: a) reference to this part of EN 302 (i.e. EN 302-6); b) the identification of the adhesive system tested; c) the proportions taken when mixing the adhesive for use; d) th