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1、BRITISH STANDARD BS EN 542:1995 Adhesives Determination of density The European Standard EN 542:1994 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 09:41:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 542:1995 This British Standard, having been prepa
2、red under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 May 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference STI/52 Draft for comment 91/55996 D
3、C ISBN 0 580 23935 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee STI/52, Adhesives, upon which the following bodies were represented: British Adhesives and Sealants Association British Plastics Federation British Stee
4、l Industry Centre for Adhesive Technology Chemical Industries Association Contract Flooring Association Department of the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laboratory) European Resin Manufacturers Association Institute of Materials Mini
5、stry of Defence Society of Motor Manufacturers and Traders Timber Research and Development Association University of Bristol Welding Institute Federation of the Electronics Industry Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 09:41:
6、39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 542:1995 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1Scope3 2Normative references3 3Principle3 4Apparatus3 5Sampling3 6Procedure for liquid adhesives3 7Procedure for solid, pasty or very viscou
7、s adhesives4 8Precision5 9Test report5 Figure 1 Suitable pyknometers4 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 09:41:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 542:1995 ii BSI 01-2000 National foreword This British Standard has been prepared by Technical Committee STI/52 and i
8、s the English language version of EN 542:1994 Adhesives Determination of density, published by the European Committee for Standardization (CEN). EN 542 was produced as a result of international discussion in which the United Kingdom participated. A British Standard does not purport to include all th
9、e necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii,
10、 the EN title page, pages 2 to 5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 09:41:39 GMT+00:00 2006, Un
11、controlled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 542 November 1994 ICS 83.180 Descriptors: Adhesives, liquids, solids, physical tests, determination, density (mass volume) English version Adhesives Determination of density Adhsifs Dtermination de la masse volumique Klebs
12、toffe Bestimmung der Dichte This European Standard was approved by CEN on 1994-11-24. 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
13、and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat 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 responsi
14、bility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, P
15、ortugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 542:1994 E Licensed Copy: sheff
16、ieldun sheffieldun, na, Mon Nov 06 09:41:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 542:1994 BSI 01-2000 2 Foreword This European Standard has been prepared by the Technical Committee CEN/TC 193, Adhesives, the secretariat of which is held by AFNOR. This European Standard shall be given the st
17、atus of a national standard, either by publication of an identical text or by endorsement, at the latest by May 1995, and conflicting national standards shall be withdrawn at the latest by May 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement thi
18、s European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 09:41:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
19、 EN 542:1994 BSI 01-20003 1 Scope This European Standard defines two methods for the determination of density which are applicable to all adhesives. One procedure is used for adhesives in liquid form and the other one for solid, very viscous or pasty adhesives. 2 Normative references This European S
20、tandard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply
21、 to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 1066, Adhesives Sampling1). EN 1067, Adhesives Examination and preparation of samples for testing1). 3 Principle The density (mass of
22、 a unit volume) of the sample is measured at 23 C as the ratio of the mass of the given volume of adhesive to the mass of the same volume of a reference liquid having a known density multiplied by its density. 4 Apparatus Usual laboratory apparatus including the following. 4.1 A glass pyknometer hav
23、ing a volume between 20 ml and 100 ml. Suitable pyknometers are Hubbard or Gay-Lussac types (Figure 1). Metal pyknometers can be used as an alternative. 4.2 Thermometer graduated in divisions of 0,1 C and accurate to 0,2 C. 4.3 Constant-temperature water bath capable of maintaining a temperature wit
24、hin 0,5 C of the test temperature. 4.4 Analytical balance accurate to 0,1 mg. 5 Sampling Take a representative sample of the adhesive to be tested in accordance with EN 1066 and homogenize as described in EN 1067. 6 Procedure for liquid adhesives 6.1 Clean the pyknometer (4.1) thoroughly. Rinse it w
25、ith water and a solvent leaving no residue on evaporation. Dry it. 6.2 Condition the clean dry pyknometer (4.1) at (23 0,5) C in the water bath (4.3) until equilibrium has been attained, dry the outside of the pyknometer and weigh it (m0). If maximum accuracy is required, the cleaning, drying and we
26、ighing should be continued until the difference between two successive weighings does not exceed 0,5 mg. 6.3 Fill the pyknometer (4.1) with freshly distilled water at (23 1) C and place the filled pyknometer in the water bath (4.3) at (23 0,5) C to reach equilibrium. Remove the pyknometer from the w
27、ater bath, dry the outside of the pyknometer and reweigh to the nearest 0,1 mg (m1). 6.4 Fill the clean dry pyknometer with the adhesive and clean any residue of adhesive from the outside of the pyknometer by wiping with absorbent material moistened with a suitable solvent and thoroughly dry by wipi
28、ng with clean absorbent material. 6.5 Place the filled pyknometer (4.1) in the water bath (4.3) at (23 0,5) C for at least half an hour to reach equilibrium. Remove the pyknometer from the water bath and thoroughly dry by wiping with clean absorbent material. Reweigh the pyknometer to the nearest 0,
29、1 mg (m2). 6.6 Expression of results Calculate the density (in grams per centimetre cube) of the adhesive at the test temperature by means of the following equation 1: NOTEThe density of water at 23 C may be taken as 0,9975 g/cm3. 1) In course of preparation. (1) where: is the density of the adhesiv
30、e at the test temperature; m0is the mass (in grams) of the empty pyknometer; m1is the mass (in grams) of pyknometer plus the water; m2is the mass (in grams) of pyknometer and test sample; wis the density of water in grams per centimetre cube at the test temperature (see note). Licensed Copy: sheffie
31、ldun sheffieldun, na, Mon Nov 06 09:41:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 542:1994 4 BSI 01-2000 7 Procedure for solid, pasty or very viscous adhesives 7.1 Clean the pyknometer (4.1) thoroughly. Rinse with water and a solvent having no residue on evaporation. Dry it. 7.2 Condition the
32、clean dry pyknometer (4.1) at (23 0,5) C in the water bath (4.3) until equilibrium has been attained, dry the outside of the pyknometer and weigh it (m0). If maximum accuracy is required, the cleaning, drying and weighing should be continued until the difference between two successive weighings does
33、 not exceed 0,5 mg. 7.3 Fill the pyknometer (4.1) with a liquid having a known density (lv) The liquid shall react in no way with the adhesive to be tested and shall not dissolve it. Place the filled pyknometer in the water bath (4.3) at (23 0,5) C to reach equilibrium. Remove the pyknometer from th
34、e water bath, dry the outside of the pyknometer and reweigh to the nearest 0,1 mg (m1). 7.4 Empty the pyknometer, clean and dry it thoroughly. Place about 5 g of the solid adhesive to be tested into the pyknometer and weigh it (m2). 7.5 Fill the pyknometer (4.1) containing the solid sample with the
35、liquid having the known density lv. Place the filled pyknometer in the water bath (4.3) at (23 0,5) C for at least half an hour to reach equilibrium. Remove the pyknometer from the water bath and thoroughly dry by wiping with clean absorbent material. Reweigh the pyknometer to the nearest 0,1 mg (m3
36、). 7.6 Expression of results Calculate the density (in grams per centimetre cube) of the adhesive at the test temperature by means of the following equation 2: Figure 1 Suitable pyknometers where: is the density of the adhesive at the test temperature; m0is the mass (in grams) of the empty pyknomete
37、r; m1is the mass (in grams) of pyknometer plus the liquid of density lv; m2is the mass (in grams) of pyknometer and solid test sample; Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 09:41:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 542:1994 BSI 01-20005 8 Precision When this method is u
38、sed with the test temperature controlled to within 0,5 C, the following levels of precision should be obtained. a) Repeatability. The difference between results obtained by the same operator with the same apparatus under constant operating conditions on identical test material should not exceed 0,00
39、1 g/cm3. b) Reproducibility. The difference between two results obtained by different operators in different laboratories on identical test material should not exceed 0,001 g/cm3. 9 Test report The test report shall include: a) a reference to this European Standard; b) the type and designation of th
40、e adhesive tested; c) the test temperature; d) the result of the test i.e. the individual results and the mean where appropriate; e) any modification to the procedure described and any circumstances which may have affected the results; f) the date of the test. m3is the mass (in grams) of the pyknome
41、ter filled with the solid test sample and liquid having lv of density; lvis the density (in grams per centimetre cube) of reference liquid. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 09:41:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 542:1995 BSI 389 Chiswick High Road London W4 4
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