【英国标准word原稿】BS EN 1239-1998 Adhesives. Freeze-thaw stability.doc

豆丁网：/kmust1british standardadhesives freeze-thaw stabilitythe european standard en 1239:1998 has the status of abritish standardics 83.180| bs en1239:1998|第 5 页 共 13 页豆丁网：/kmust1licensed copy: sheffieldun sheffieldun, na, sat oct 28 16:21:29 gmt+00:00 2006, uncontrolled copy, (c) bsi|no copying without bsi permission except as permitted by copyright lawbs en 1239:1998national forewordthis british standard is the english language version of en 1239:1998.the uk participation in its preparation was entrusted to technical committeesti/52, adhesives, which has the responsibility to: aid enquirers to understand the text; present to the responsible european committee any enquiries on the interpretation, or proposals for change, and keep the uk interests informed; monitor related international and european developments and promulgate them in the uk.a list of organizations represented on this committee can be obtained on request to its secretary.cross-referencesthe british standards which implement international or european publications referred to in this document may be found in the bsi standards catalogue under the section entitled international standards correspondence index, or by using thefind facility of the bsi standards electronic catalogue.a british standard does not purport to include all the 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 pagesthis document comprises a front cover, an inside front cover, the en title page, pages 2 to 4, an inside back cover and a back cover.licensed copy: sheffieldun sheffieldun, na, sat oct 28 16:21:29 gmt+00:00 2006, uncontrolled copy, (c) bsiamd. no.datetext affectedthis british standard, having been prepared 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 july 1998bsi 1998isbn 0 580 29641 5amendments issued since publicationlicensed copy: sheffieldun sheffieldun, na, sat oct 28 16:21:29 gmt+00:00 2006, uncontrolled copy, (c) bsieuropean standarden 1239norme europe enneeuropa ische normfebruary 1998ics 83.180descriptors: adhesives, components, tests, determination, freeze-thaw resistance, viscosity measurements, procedure, test results, classificationenglish versionadhesives freeze-thaw stabilityadhe sifs stabilite au gel-de gel klebstoffe gefrier-auftau-stabilita tthis european standard was approved by cen on 2 january 1998.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 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 responsibility 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, czech republic, denmark, finland, france, germany, greece, iceland, ireland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and united kingdom.ceneuropean committee for standardization comite europe en de normalisation europa isches komitee fu r normungcentral secretariat: rue de stassart 36, b-1050 brussels1998 cen all rights of exploitation in any form and by any means reserved worldwide for cen nationalmembers.ref. no. en 1239:1998 epage en 1239:1998bsi 1998forewordthis european standard has been prepared by technical committee cen/tc 193 adhesives, the secretariat of which is held by afnor.contentspagelicensed copy: sheffieldun sheffieldun, na, sat oct 28 16:21:29 gmt+00:00 2006, uncontrolled copy, (c) bsithis 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 august 1998, and conflicting national standards shall be withdrawn at the latest by august 1998.according to the cen/cenelec internal regulations, the national standards organizations of the following countries are bound to implement this european standard: austria, belgium, czech republic, denmark, finland, france, germany, greece, iceland, ireland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and the united kingdom.foreword 21scope 32normative references 33definitions 34principle 35safety 36apparatus 37sampling, examination andpreparation of samples 38procedure 39expression of results andclassification 410test report 4page 3en 1239:19981 scopethis standard specifies a method for the evaluation of the freeze-thaw stability of adhesives, their basic constituents and related products.this test has no significance if the sample does not freeze under the test conditions.2 normative referencesthis european standard 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 to this european standard onlywhen incorporated in it by amendment or revision. for undated references the latest edition of the publication referred to applies.en 923, adhesives terms and definitions. en 1066, adhesives sampling.en 1067, adhesives examination and preparation of samples for testing.pren 12092, adhesives determination of viscosity.3 definitionsfor the purposes of this standard the definitions in accordance with en 923 apply.4 principlemeasure the viscosity of a sample of the adhesive being tested by placing it in a test chamber for 16 h at a selected temperature of 25 c, 210 c, 215 c or220 c, then holding it for 8 h at 23 c and finally check the appearance of the adhesive.if no coagulum is formed, the cycle is repeated, i.e. the sample is stored at the selected temperature foranother 16 h and then held at 23 c for 8 h up to a maximum number of three cycles. the final viscosity of the adhesive is measured.freeze-thaw cycle stability is indicated by the selected test temperature and the number of cycles endured without visible coagulation at an increase of viscosity not exceeding the manufacturers specification limits.note 1 the freezing temperature selected depends on the chemical nature of the adhesive to be tested and the temperature conditions to which the adhesive is exposed in service. if necessary, preliminary tests should be carried out in order to determine the appropriate test temperature.note 2 the results obtained by this method are not necessarily applicable to larger-volume vessels.5 safetypersons using this standard shall be familiar with normal laboratory practice.this standard does not purport to address all safety problems, if any, associated with its use.it is the responsibility of the user to establish safety and health practices and to ensure compliance with any european and national regulatory conditions.6 apparatus6.1 cylindrical container, 90 mm height, 60 mm inside diameter and 2 mm wall thickness with a large opening on the top and capable of being sealed with an airtight lid.note at test temperatures of 25 c or 210 c the container can be made of polyethylene; at lower freezing temperaturescylindrical stainless steel containers can be used.6.2 test chamber, a cabinet, room or enclosure space large enough to contain the samples to be tested, allowing at least 25 mm of air space between the sides of adjacent containers and capable of being controlled at temperatures of (251) c, (2101) c,(2151) c, and (2201) c, respectively.6.3 thermometer, allowing measurement of the temperature inside the test chamber to be 0,5 c.6.4 viscometer, in accordance with pren 12092 to determine the viscosity of the adhesive to be tested.7 sampling, examination and preparation of samplesa significant sample of the adhesive shall be taken in accordance with en 1066 and prepared for testing as described in en 1067.8 procedure8.1 measure the viscosity of the sample at 23 c in accordance with pren 12092 using a suitable viscometer (see 6.4) and note the result.8.2 put (200 5) ml of the test sample into the cylindrical container (see 6.1).8.3 seal the container airtight and place it for 16 h in the test chamber (see 6.2) set at the selected freezing temperature.8.4 remove the container from the test chamber and let it thaw at 23 c for 8 h.8.5 check by insertion of a glass rod the condition of the sample (homogeneous, water layer on its top, thickened, irreversible gelation, e.g. by formation of elastic, rubbery materials) and note the result.note if visible coagulation is formed that cannot be dispersedby manual stirring, the test is regarded as completed. if this test is not conclusive, the adhesive should be exposed to a further complete freeze-thaw cycle.licensed copy: sheffieldun sheffieldun, na, sat oct 28 16:21:29 gmt+00:00 2006, uncontrolled copy, (c) bsibsi 1998page en 1239:1998bsi 1998licensed copy: sheffieldun sheffieldun, na, sat oct 28 16:21:29 gmt+00:00 2006, uncontrolled copy, (c) bsi8.6 homogenize the sample, where the sample shows a surface-water layer or is thickened.8.7 continue the test until three freeze-thaw cycles are completed without the appearance of visible coagulum.8.8 measure again the viscosity of the sample at 23 cas described in note the test temperature, the condition of the adhesive (see 8.5) after each cycle, the number of cycles completed without formation of visible, indispensable coagulum, the initial viscosity (see 8.1) and the final viscosity (8.8) determined.9 expression of results and classification9.1 expression of resultsthe freeze-thaw stability of the adhesive tested at a selected freeze temperature is expressed as the number of cycles endured without the formation of visible and indispensable coagulum and a change of viscosity not exceeding the manufacturers specification limits.9.2 classificationin accordance with the test results obtained, the adhesive shall be classified:freeze temperature/number of cyclesfor example, an adhesive belongs to the freeze-thaw stability class 210 c/3 cycles in accordance with en 1239 if enduring three cycles without visible coagulation at a freeze temperature of 210 c.10 test reportthe test report shall include:a) a reference to this european standard;b) a complete identification of the adhesive under test, in particular type, name/designation, manufacturer, and lot number/date of supply;c) the freeze temperature applied in the test cycles;d) initial (see 8.1) and final (see 8.8) viscosities of the adhesive tested;e) the test results expressed in accordance with 9.1;f) classification in accordance with 9.2;g) any modification of the procedure described in this standard and any circumstances which may have affected the result;h) date of test.blanklicensed copy: sheffieldun sheffieldun, na, sat oct 28 16:21:29 gmt+00:00 2006, uncontrolled copy, (c) bsibsi389 chiswick high roadlondonw4 4al| bsi british standards institution| bsi is the independent national body responsible for preparing british standards. it| presents the uk view on standards in europe and at the international level. it is| incorporated by royal charter.| revisions| british standards are updated by amendment or revision. users of british standards| should make sure that they possess the latest amendments or editions.| it is the constant aim of bsi to improve the quality of our products and services. we| would be grateful if anyone finding an inaccuracy or ambiguity while using this| british standard would inform the secretary of the technical committee responsible,| the 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