ASTM_D_2556_-_14_2018.pdf

Designation:D255614(Reapproved 2018)Standard Test Method forApparent Viscosity of Adhesives Having Shear-Rate-Dependent Flow Properties Using Rotational Viscometry1This standard is issued under the fixed designation D2556;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the measurement of the appar-ent viscosity of shear-rate-dependent adhesives using a rota-tional viscometer.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 Adhesives3.Terminology3.1 Definitions:3.1.1 Many terms in this test method are defined in Termi-nology D907.3.1.2 Newtonian behavior,nthe property of a liquid inwhich its viscosity is constant over a stated range of strainrates.(Compare non-Newtonian behavior.)3.1.3 non-Newtonian behavior,nthe property of a liquidin which its viscosity is not constant over a stated range ofstrain rates.3.2 Definitions of Terms Specific to This Standard:3.2.1 apparent viscosity,nresistance to shear at a givenrate of shear,expressed as viscosity in mPas.NOTE1The SI unit of mPas is equivalent to cP.3.2.2 thixotropic index,nthe ratio of apparent viscositiesat two rotational speeds.4.Significance and Use4.1 The principle of measurement is based upon a reversibleisothermal change in apparent viscosity with change in rate ofshear produced by a change in rotational speed.4.2 Measurement is performed with a rotational viscometerunder standardized conditions with rigid control of the timeintervals of measurement.Viscosity readings are obtained atthe end of 1 min for each rotational speed.Changes from thelowest speed to the highest speed,and return to the lowestspeed,are made without stopping the instrument.5.Apparatus5.1 Rotational ViscometerThe essential instrumentationrequired providing the minimum rotational viscometer analyti-cal capabilities include:5.1.1 A drive motor,to apply a unidirection rotationaldisplacement to the specimen at a rate of 0.2 revolutions perminute to 60 rev/min constant to within 61%.5.1.2 Aforce sensor to measure the torque developed by thespecimen to within 61%.5.1.3 A coupling shaft or other means to transmit therotational displacement from the motor to the specimen.5.1.4 A spindle,geometry,tool,or rotational element to fixthe specimen between the drive shaft and a stationary position.NOTE2Each rotational element typically covers a range of 1.5decades of viscosity.The rotational element may be a spindle,disk,T-bar,coaxial cylinder of other configuration selected by mutual agreementamong the parties involved.NOTE3Do not use a scored,warped,or otherwise damaged rotationalelement.1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.10 on WorkingProperties.Current edition approved Nov.1,2018.Published November 2018.Originallyapproved in 1966.Last previous edition approved in 2014 as D2556 14.DOI:10.1520/D2556-14R18.2For 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.1 5.1.5 Aspecimen container with capacity to contain the testspecimen during testing.NOTE4The size of the container used is determined by the size anddesign of the rotational element used.The container used may be specifiedby mutual agreement among the parties involved.5.1.6 A guard to protect the geometry from mechanicaldamage.5.1.7 A temperature sensor to provid