ASTM_D_6204_-_19a.pdf

Designation:D620419aStandard Test Method forRubberMeasurement of Unvulcanized RheologicalProperties Using Rotorless Shear Rheometers1This standard is issued under the fixed designation D6204;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 test method covers the use of a rotorless oscillatingshear rheometer for the measurement of the flow properties ofraw rubber and unvulcanized rubber compounds.These flowproperties are related to factory processing.1.2 The values stated in SI units are to be regarded asstandard.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:2D1485 Practice for Rubber from Natural SourcesSampling and Sample PreparationD1646 TestMethodsforRubberViscosity,StressRelaxation,andPre-VulcanizationCharacteristics(Mooney Viscometer)D3896 Practice for Rubber From Synthetic SourcesSamplingD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustriesD5289 Test Method for Rubber PropertyVulcanizationUsing Rotorless Cure MetersD6601 Test Method for Rubber PropertiesMeasurementof Cure and After-Cure Dynamic Properties Using aRotorless Shear Rheometer3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 complex shear modulus,G*,nthe ratio of peakamplitude shear stress to peak amplitude shear strain;mathematically,G*=(S*/Area)/Strain=(G2+G”2)1/2.3.1.2 complex torque,S*,nthe peak amplitude torqueresponse measured by a reaction torque transducer for asinusoidally applied strain;mathematically,S*is computed byS*=(S2+S”2)1/2.3.1.3 dynamic complex viscosity*,nthe ratio of thecomplex shear modulus,G*to the oscillation frequency,inradians per second.3.1.4 elastic torque,S,nthe peak amplitude torque com-ponent that is in phase with a sinusoidally applied strain.3.1.5 loss angle,nthe phase angle by which thecomplex torque(S*)leads a sinusoidally applied strain.3.1.6 loss factor,tan,nthe ratio of loss modulus tostorage modulus,or the ratio of viscous torque to elastictorque;mathematically,tan =G”/G=S”/S.3.1.7 loss shear modulus G”,nthe ratio of(viscous)peakamplitude shear stress to peak amplitude shear strain for thetorque component 90 out of phase with a sinusoidally appliedstrain;mathematically,G”=(S”/Area)/Peak Strain.3.1.8 real dynamic viscosity,nthe ratio of the loss shearmodulus,G”to the oscillation frequency,in radians persecond.3.1.9 storage shear modulus,G,nthe ratio of(elastic)peak amplitude shear stress to peak amplitude shear strain forthe torque component in phase with a sinusoidally appliedstrain;mathematically,G=(S/Area)/Peak Strain.3.1.10 viscous torque,S”,nthe peak amplitude torquecomponent,which is 90 out of phase with a sinusoidallyapplied strain.1This test method is under the jurisdiction of ASTM Committee D11 on Rubberand Rubber-like Materials and is the direct responsibility of Subcommittee D11.12on Processability Tests.Current edition approved Dec.1,2019.Published December 2019.Originallyapproved in 1997.Last previous edition approved in 2019 as D6204 19.DOI:10.1520/D6204-19A.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 4.Summary of Test Method4.1 A rubber test specimen is contained in a die cavity thatis closed and maintained at an elevated temperature.The cavityis formed by two dies,one of which is oscillated through arotary amplitude.This action produces a sinusoidal torsionalstrain in the test specimen,resulting in a sinusoidal torque,which measures a viscoelastic quality of the test specimen.Thetest specimen