1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12962:2011Adhesives Determinationof elastic behaviour of liquidadhesives (elasticity index)BS EN 12962:2011 BRITISH STANDARDNational forewordThis British Standard is the UK
2、 implementation of EN 12962:2011. Itsupersedes BS EN 12962:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/52, Adhesives.A list of organizations represented on this committee can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
3、purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 72240 0ICS 83.180Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStanda
4、rds Policy and Strategy Committee on 31 May 2011.Amendments issued since publicationDate Text affectedBS EN 12962:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12962 April 2011 ICS 83.180 Supersedes EN 12962:2001English Version Adhesives - Determination of elastic behaviour of liquid adhe
5、sives (elasticity index) Adhsifs - Dtermination du comportement lastique des adhsifs liquides (indice dlasticit) Klebstoffe - Bestimmung des elastischen Verhaltens flssiger Klebstoffe (Elastizittsindex) This European Standard was approved by CEN on 10 March 2011. CEN members are bound to comply with
6、 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 and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Manage
7、ment 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 the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same stat
8、us as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal
9、, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means res
10、erved worldwide for CEN national Members. Ref. No. EN 12962:2011: EBS EN 12962:2011EN 12962:2011 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Terms and definitions .54 Principle 55 Apparatus .56 Procedure .57 Expression of results 78 Test report 7Bibliography 8BS E
11、N 12962:2011EN 12962:2011 (E) 3 Foreword This document (EN 12962:2011) 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
12、 endorsement, at the latest by October 2011, and conflicting national standards shall be withdrawn at the latest by October 2011. 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
13、 identifying any or all such patent rights. This document supersedes EN 12962:2001. The main modifications regarding the previous version are in Figure 1 and 6.10. SAFETY STATEMENT Persons using this document should be familiar with the normal laboratory practice, if applicable. This document does n
14、ot 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 understood that some of the material per
15、mitted 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, the user of the standard should take care to carry out an approp
16、riate disposal of the wastes, according to local regulation. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia
17、, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 12962:2011EN 12962:2011 (E) 4 Introduction Many liquid elastomeric
18、adhesives show, depending on the nature of basic elastomer, under specific conditions an elastic behaviour. The elastic behaviour of an adhesive apart of its viscosity is of great practical significance. It affects both processability (by brush or roller) of an adhesive and its bonding properties to
19、 porous substrates like wood, leather or fabric. For achieving optimum bond strength on porous substrates it is indispensable to adjust both viscosity and elasticity to the porosity of the substrates to be bonded. At a given viscosity, if the elasticity is too high, the adhesive will only rest on th
20、e surface of the substrate without penetration and anchoring in the substrate. If, on the contrary, the elasticity is too low, the adhesive is almost completely absorbed by the porous substrate without being able to form a bond-line. In both cases a lower bond strength results. A “cone and plate rhe
21、ometer“ as specified in EN 12092 allows to determine viscosity and elasticity of an adhesive by measurement of shear tension and tension vertical to shear tension (“normal tension“). However, a “cone and plate rheometer“ is very expensive and its maintenance too, operating requires a skilled staff,
22、and cleaning is time-consuming. It is mainly used for scientific purposes. BS EN 12962:2011EN 12962:2011 (E) 5 1 Scope This European Standard specifies a test method to determine the elastic behaviour of and elastomeric monocomponent liquid adhesive under specified conditions. This method is particu
23、larly suitable for production control. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendmen
24、ts) applies. EN 923:2005+A1:2008, Adhesives Terms and definitions EN 1067, Adhesives Examination and preparation of samples for testing EN ISO 15605, Adhesives Sampling (ISO 15605:2000) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008
25、apply. 4 Principle A specifically shaped and graduated spindle (see Figure 1) is dipped into the adhesive to be tested. The shaft of the spindle is attached to a motor rotating at a constant specified speed for a certain period of time. During rotation, the adhesive under test rises (in equilibrium
26、to gravitation) up to a reproducible height on reading of the spindle shaft. The height (in millimetres) measured is taken as “elasticity index“. 5 Apparatus 5.1 Beakers, of 100 mm diameter, capacity about 1 000 ml (see Figure 1). 5.2 Spindle, with size and dimensions shown in Figure 1, with marking
27、s at 10 mm intervals and sub-graduated to millimetres. 5.3 Mechanical or electronic stirrer, with the possibility of fine speed control. 5.4 Analytical balance, with scale divisions of 0,01 g. 5.5 Stopwatch, or other suitable timing-device with accuracy of 0,2 s or higher. 5.6 Temperature-controlled
28、 room or enclosure, capable of maintaining the sample and the necessary apparatus at (23,0 0,5) C. 6 Procedure 6.1 Carry out the determination in duplicate. BS EN 12962:2011EN 12962:2011 (E) 6 6.2 A significant sample of the adhesive shall be taken in accordance with EN ISO 15605 and prepared for te
29、sting as described in EN 1067. Store the sample in a closed container and keep it in the temperature-controlled room (5.6) until the sample reaches (23 2) C (at least 30 min). In order to minimize evaporation of solvent, the operations from 6.3 to 6.8 shall be carried out in the shortest possible ti
30、me. 6.3 Weight (200,0 0,1) g of the adhesive under test into the beaker (5.1). 6.4 Place the beaker containing the adhesive under the stirrer (5.3) taking care to centre the beaker. Dimensions in millimetres Key 1 Solution level Figure 1 Spindle BS EN 12962:2011EN 12962:2011 (E) 7 6.5 Dip slowly the
31、 spindle (5.2) into the adhesive avoiding trapping air bubbles in the liquid (for example hold the spindle at an angle of approximately 45 to the surface of the product and manually turn during the immersion). 6.6 Insert the spindle in the mandrel of the stirrer. 6.7 Regulate the spindle immersion u
32、ntil the liquid reaches the highest part of the cone: position zero, and lock the mandrel of the stirrer. 6.8 Protect the adhesive by covering the beaker with a properly shaped paper. 6.9 Start the motor set at the speed of (300 10) min-1. 6.10 Start the stopwatch simultaneously with the motor and t
33、hen stop both after (30 1) s from the starting. 6.11 Read and note the height reached by the adhesive on the shaft of the spindle for the test report. Ignore any value exceeding 50 mm and the results of any tests during which an irregular, irreproducible behaviour of the adhesive on the rotating sti
34、rrer was stated, e.g. a “throwing“ caused by centrifugal forces. 6.12 Clean the spindle with a suitable solvent (acetone, aliphatic hydrocarbons or ethanol) and repeat the measurement. 6.13 Take the average of the two values measured. 7 Expression of results Express the “elasticity index“ as the mea
35、n of the duplicate determination (6.11) in millimetres rounded to the nearest 1 mm. 8 Test report The test report shall include: a) a reference to this European Standard, i.e. EN 12962; b) all details necessary for a complete identification of the adhesive tested; c) any circumstances which may have
36、 affected the result; d) the test results according to Clause 7, individual and mean values; e) date of the test. BS EN 12962:2011EN 12962:2011 (E) 8 Bibliography EN 12092, Adhesives Determination of viscosity This page deliberately left blankBSI is the independent national body responsible for prep
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