ASTM_D_7149_-_05_2021.pdf

Designation:D714905(Reapproved 2021)Standard 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 revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice determines the ability 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 standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D907 Terminology 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 Properties Using Ro-tational Viscometry3.Terminology3.1 Definitions:3.1.1 Many of the terms utilized in this practice are definedin Terminology 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 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 the 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-spindle 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 adhesive 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 Check the pH of the adhesive after it is transferred intothe container,as defined in Test Method D1293.1This practice is under the jurisdiction of ASTM Committee D14 on Adhesivesand is the direct responsibility of Subcommittee D14.10 on Working Properties.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 2005.Last previous edition approved in 2016 as D7149 05(2016).DOI:10.1520/D7149-05R21.2For referenced ASTM standards,visit the ASTM 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.17.4 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.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/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 a