1、Designation:D714905(Reapproved 2011)1Standard Practice forDetermining the Freeze Thaw Stability of Adhesives1This standard is issued under the fixed designation D7149;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEUnits of measure were editorially corrected from hard to soft conversions in April 2011.1.Scope1.1 This practice determines the ability
3、 of an adhesive towithstand repeated freezing and thawing cycles at specifictemperatures without any significant change in physical prop-erties.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This practice does not purpo
4、rt to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this practice to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitation prior to use.2.Referenced Documents2.1 ASTM Standards:2D907 Term
5、inology of AdhesivesD1084 Test Methods for Viscosity of AdhesivesD1293 Test Methods for pH of WaterD2556 Test Method for Apparent Viscosity of AdhesivesHaving Shear-Rate-Dependent Flow Properties3.Terminology3.1 Definitions:3.1.1 Many of the terms utilized in this practice are definedin Terminology
6、D907.4.Significance and Use4.1 This practice will provide a procedure for determiningthe stability of an adhesive to withstand five repeated cycles,oras otherwise specified,of freezing and thawing at a specifictemperature.4.2 This practice will allow the user to determine whether ornot the adhesive
7、can be appropriately applied after cycling offreezing and thawing.4.3 This practice will identify any significant changes in themanufactured viscosity of the product after five cycles,or asotherwise specified,of freezing and thawing at a specifictemperature.4.4 This practice will help determine if t
8、he pH of adhesivehas changed significantly due to the freezing and thawingcycles.5.Apparatus5.1 A 1.0 L(1 qt)container,or larger,with lid.Othercontainer sizes may be applicable for some adhesives.5.2 Freezer capable of maintaining-18 6-2C(0.0 6-5F)to-7 6-2C(20 6-5F).5.3 Brookfield RVT Viscometer 1-s
9、pindle TC at 5 20rpms,Heliopath stand.NOTE1Other viscometer models,their speed and spindle size,may beutilized as long as they comply to Test Methods D1084 or D2556 and arerecommended by the manufacturer for such use.5.4 pH meter.5.5 Tongue depressor or similar.6.Conditioning6.1 Condition the adhesi
10、ve to be tested 24 h at 23 6-2C(73 6-4F)with a relative humidity if 50 6-5%prior totesting.7.Procedure7.1 Fill the container with adhesive to be tested.7.2 Check the viscosity of the adhesive after it is transferredinto the container,as defined in Test Methods D1084(MethodB)or Test Method D2556.7.3
11、Check the pH of the adhesive after it is transferred intothe container,as defined in Test Method D1293.7.4 Close the container with lid and place it into the freezerat the specified temperature to be tested for a period of not lessthan 16 h.1This practice is under the jurisdiction of ASTM Committee
12、D14 on Adhesivesand is the direct responsibility of Subcommittee D14.10 on Working Properties.Current edition approved April 1,2011.Published April 2011.Originallyapproved in 2005.Last previous edition approved in 2005 as D7149-05.DOI:10.1520/D7149-05R11E01.2For referenced ASTM standards,visit the A
13、STM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States
14、1 7.5 Remove container from freezer after the appropriatetime limit and allow to thaw until the adhesive reaches roomtemperature as defined in 6.1.It is recommended that aconstant temperature oven with a temperature set at 24 6-2C(75 6-4F)be used for the thawing procedure.This constitutesone freeze/
15、thaw cycle.Remove container lid by appropriatemeans;if the adhesive forms a surface film remove with thetongue depressor without stirring contents.7.6 Insert clean tongue depressor about one inch into theadhesive and remove slowly.7.7 If the adhesive“strings”from the tongue depressor orappears gelle
16、d,the sample has failed the test.Report whichparticular cycle displayed a change in the physical properties orthat had failed.7.8 If adhesive appears to be of normal consistency,mea-sure viscosity and pH and record.7.9 Repeat steps 7.3-7.8 for a total of five cycles or until achange in physical properties or failure is noted.8.Reporting8.1 Report the following information:8.1.1 Type of adhesive.8.1.2 Temperature at which product was frozen and tested.8.1.3 Initial viscosity and pH of adhesive.8.
