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!%3s“2021680www.din.deDDIN EN 302-7Adhesives for load-bearing timber structures Test methods Part 7: Determination of the working life under referenced conditions;English version EN 302-7:2013,English translation of DIN EN 302-7:2013-06Klebstoffe fr tragende Holzbauteile Prfverfahren Teil 7: Bes
3、timmung der Gebrauchsdauer bei Referenzbedingungen;Englische Fassung EN 302-7:2013,Englische bersetzung von DIN EN 302-7:2013-06Adhsifs pour structures portantes en bois Mthodes dessai Partie 7: Dtermination de la dure dutilisation dans des conditions de rfrence;Version anglaise EN 302-7:2013,Traduc
4、tion anglaise de DIN EN 302-7:2013-06SupersedesDIN EN 302-7:2004-10www.beuth.deDocument comprises 11 pagesIn case of doubt, the German-language original shall be considered authoritative.06.13DIN EN 302-7:2013-06 2 A comma is used as the decimal marker. National foreword This document (EN 302-7:2013
5、) 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 Spiegelausschuss zu CEN
6、/TC 193/SC 1 Holzklebung. Amendments This standard differs from DIN EN 302-7:2004-10 as follows: a) the title of the standard has been modified; b) the standard has been editorially revised. Previous editions DIN EN 68141: 1969-10, 1995-08 DIN EN 302-7: 2004-10 EUROPEAN STANDARD NORME EUROPENNE EURO
7、PISCHE NORM EN 302-7 March 2013 ICS 83.180 Supersedes EN 302-7:2004English Version Adhesives for load-bearing timber structures - Test methods - Part 7: Determination of the working life under referenced conditions Adhsifs pour structures portantes en bois - Mthodes dessai - Partie 7 : Dtermination
8、de la dure dutilisation dans des conditions de rfrence Klebstoffe fr tragende Holzbauteile - Prfverfahren - Teil 7: Bestimmung der Gebrauchsdauer bei Referenzbedingungen This European Standard was approved by CEN on 5 February 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regul
9、ations which stipulate the conditions 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 membe
10、r. This European Standard exists in 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. CE
11、N members are the national standards 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,
12、Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, 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
13、by any means reserved worldwide for CEN national Members. Ref. No. EN 302-7:2013: EEN 302-7:2013 (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 Expression of results 8 8 Test report 8 DIN EN 3
14、02-7:2013-06 EN 302-7:2013 (E) 3 Foreword This document (EN 302-7:2013) 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 b
15、y endorsement, at the latest by September 2013, and conflicting national standards shall be withdrawn 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 responsibl
16、e for identifying any or all such patent rights. This document supersedes EN 302-7:2004. 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, Czec
17、h 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, Turkey and the United Kingdom
18、. DIN EN 302-7:2013-06 EN 302-7:2013 (E) 4 Introduction This document is one of a series dealing with adhesives for use with timber structures, and is published in support of EN 1995, Eurocode 5: Design of timber structures. The series consists of three classification and performance requirements fo
19、r adhesives for load-bearing timber structures; phenolic and aminoplastic adhesives (EN 301), one component polyurethane adhesive (EN 15425) and emulsion polymerised 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
20、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 for load bearing timber structures Classification and performance requirements prEN 16254,
21、Adhesives Emulsion polymerized isocyanate (EPI) for load-bearing timber structures Classification and performance requirements EN 302, Adhesives for load-bearing timber structures Test methods Part 1: Determination of longitudinal tensile shear strength Part 2: Determination of resistance to delamin
22、ation 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 of the effects of wood shrinkage on the shear strength Part 5: Determination of maximum assembly time under referenced conditions Part
23、6: Determination of the minimum pressing time under referenced conditions Part 7: Determination of the working life under referenced conditions EN 15416, Adhesives for load bearing timber structures other than phenolic and aminoplastic Test methods Part 2: Static load test of multiple bondline speci
24、mens in compression shear Part 3: Creep deformation test at cyclic climate conditions with specimens loaded in bending shear Part 4: Determination of open assembly time for one component polyurethane adhesives Part 5: Determination of conventional pressing time Safety statement Persons using this do
25、cument 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. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulato
26、ry conditions. DIN EN 302-7:2013-06 EN 302-7:2013 (E) 5 Environmental statement It is understood that some of the material permitted in this standard can have a negative environmental impact. As technological advantages lead to better alternatives for these materials, they will be eliminated from th
27、is 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 the wastes, according to local regulations. DIN EN 302-7:2013-06 EN 302-7:2013 (E) 6 1 Scope This European Standard specifies a metho
28、d for determining the working life for adhesives mixed with hardener for load-bearing timber structures, by a viscosity test. This method is not suitable for determining the working life of a multi-component adhesive whose actual working life is very short. This document is only intended for obtaini
29、ng a reliable basis for comparison between adhesives. The method gives results which cannot be applied to the safe manufacture of timber structures without modifications for the influences of factory temperature and relative air humidity. 2 Normative references The following documents, in whole or i
30、n 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 923:2005+A1:2008, Adhesives Terms and defi
31、nitions EN ISO 2555:1999, Plastics Resins in the liquid state or as emulsions or dispersions Determination of apparent viscosity by the Brookfield test method (ISO 2555:1989) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008 and the fol
32、lowing apply. 3.1 working life under referenced conditions period of time at 20 C during which an adhesive, prepared for application, increases in apparent viscosity to 25 000 mPa s under referenced conditions 4 Principle The viscosity of a specified volume of adhesive at 20 C is monitored using a B
33、rookfield type viscometer, until it reaches 25 000 mPa s. 5 Apparatus 5.1 Beaker, approximately 850 ml capacity, 90 mm to 95 mm internal diameter, 115 mm to 160 mm height with a wall thickness not exceeding 1 mm. The beaker shall be made of a material that ensures a good heat conductivity and that d
34、oes not react with the adhesive. NOTE A stainless steel beaker is suitable for most of the commercial adhesives used for the gluing of load-bearing timber structures. 5.2 Brookfield type viscometer, type A. DIN EN 302-7:2013-06 EN 302-7:2013 (E) 7 The detailed operating principle of this apparatus,
35、its description and characteristics are given in EN ISO 2555. The viscometer comprises the following elements: the viscometer body; seven removable, interchangeable spindles, numbered 1 to 7; a support which holds the viscometer and moves it into the vertical plane; a removable guard stirrup, which
36、is not used in this method. NOTE A Brookfield RVF model is an example of a suitable product available commercially.1)5.3 Temperature regulated water bath, capable of maintaining the mixture to be tested at 20 C with an accuracy of 2 C. 5.4 Thermometer, graduated to 0,1 C, to measure the temperature
37、of the adhesive being tested. 6 Procedure 6.1 Handle the adhesive components in accordance with the instructions of the manufacturer of the adhesive. Ensure that at the start of the test, all the components have a temperature of (20 0,5) C. Ensure that during the test, the relative humidity of the a
38、ir in the testing room remains at (65 5) %. NOTE It is a common practice to store the components at (20 2) C for one night before testing. 6.2 Set up, calibrate and operate the viscometer in accordance with the instructions of the instrument manufacturer. Choose a rotational frequency of 20 min-1. S
39、pindles shall be chosen such that the instrument reading is in the range from 20 % to 95 % of the full scale value. 6.3 Prepare a sufficient amount of the glue mix in the beaker (5.1) to fill 2/3 of its volume, in accordance with the specifications of the manufacturer. Start to record the time at th
40、e moment (t0) the component that initiates the reaction is added. 6.4 Gently stir the mixture manually for 5 min at (20 2) C. In order to allow any exothermic reaction to proceed normally, do not place the beaker in the water bath during this operation and avoid heating the mixture by body heat thro
41、ugh the hand. 6.5 Place the beaker in the water bath (5.3) adjusted at (20 2) C for the rest of the procedure. Adjust the water level of the water bath so that it is slightly above that of the adhesive in the beaker (5.1). Keep the beaker uncovered throughout the test. 6.6 Determine the viscosity of
42、 the adhesive system at 15 min intervals, or with shorter intervals for fast setting adhesives, from the initial time (t0). About one minute before each reading, gently stir the sample for 15 s to ensure homogeneity. 6.7 Remove the beaker from the water bath, hold the spindle at an angle of about 45
43、 to the surface of the adhesive and immerse it in the product, taking care not to introduce air bubbles. Orientate the spindle vertically and connect it to the shaft of the apparatus. Check that the spindle is vertical using the bubble level and that the spindle is immersed to the underside of the m
44、ark on its shaft. Allow the instrument to run for 30 s and read the torque meter to the nearest 0,25 % of the maximum value indication at the pre-set time. Lock the 1) This information is given for the convenience of users of this European Standard and does not constitute an endorsement by CEN of th
45、e product named. Equivalent products may be used if they can be shown to lead to the same results. DIN EN 302-7:2013-06 EN 302-7:2013 (E) 8 needle and stop the motor to take the reading. Immerse the thermometer (5.4) into the sample and record the temperature. Place the beaker back into the water ba
46、th (5.3). 6.8 After each measurement, detach the spindle from the instrument, wash it thoroughly in a suitable solvent and dry it before re-use. 6.9 Continue determining the viscosity of the sample at 15 min intervals until the viscosity exceeds 25 000 mPa s. In order to increase the accuracy of the
47、 determination of the conventional working life, it is advisable to reduce the time interval between two readings in the final stage of the reaction. 7 Expression of results Calculate the apparent viscosity, in millipascal seconds (mPa s), of the adhesive system tested, using the formula: = k x l wh
48、ere is viscosity in millipascal seconds; k is a coefficient depending on the rotational frequency-spindle combination used; in the case of apparatus as specified in 5.2 and in EN ISO 2555:1999, B.3, the values of k are as shown in Table 1; l is the value read on the scale. Table 1 Coefficient k (sca
49、le 0 to 100) for each spindle and a rotational frequency of 20 min-1 Spindle number 1 2 3 4 5 6 7 Coefficient k 5 20 50 100 200 500 2 000 Plot the change of apparent viscosity with time (in minutes). Record the working life of the adhesive under referenced conditions as the time between t0(see 6.3) and the time that the apparent viscosity reaches 25 000 mPa s. 8 Test report The test report shall contain the following information: a) reference to this document (EN 302-7); b)
