ASTM_D_3346_-_17_2022.pdf

Designation:D334617(Reapproved 2022)Standard Test Methods forRubber PropertyProcessability of Emulsion SBR(Styrene-Butadiene Rubber)With the Mooney Viscometer(DeltaMooney)1This standard is issued under the fixed designation D3346;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 These test methods explain the use of the shearing diskviscometer to obtain an indication of the processability ofnon-pigmented emulsion styrene-butadiene rubbers(SBR).The test methods described should not be used to compareprocessability characteristics of polymers that produce a testcurve significantly different from that shown in Fig.1.1.2 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:2D1646 TestMethodsforRubberViscosity,StressRelaxation,andPre-VulcanizationCharacteristics(Mooney Viscometer)D3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3896 Practice for Rubber From Synthetic SourcesSamplingD4483 Practice for Evaluating Precision for Test MethodStandards in the Rubber and Carbon Black ManufacturingIndustries3.Terminology3.1 Definitions:3.1.1 Mooney,nthe difference in Mooney viscosityrecorded for a rubber at specified times during a test.3.1.2 Mooney viscosity,nmeasure of the viscosity of arubber or rubber compound determined in a Mooney shearingdisk viscometer;viscosity is indicated by the torque required torotate a disk embedded in a rubber specimen and enclosed inthe die cavity under specified conditions.4.Summary of Test Methods4.1 In Test Method A,the difference in Mooney viscosity at100C(212F)is determined at two specified times.Eithermassed or unmassed samples may be used.4.2 In Test Method B,the Mooney viscosity difference forunmassed samples is determined between the minimum re-corded directly after starting the rotor and the subsequentmaximum(see Fig.1).5.Significance and Use5.1 These empirical tests have been found to be suitable forranking a series of unpigmented emulsion SBR in order ofprocessability.They may also be used for comparing a produc-tion lot with a standard of known processability characteristics.The difference between Mooney viscosities at two specifiedtimes will rank those emulsion SBR polymers that differappreciably in this property according to their processability.The actual values obtained for a given polymer depend onwhether or not the sample was massed,and may vary betweenlaboratories or with the type of machine used,and with thespecified times at which Mooney viscosity values were taken.6.Apparatus6.1 The apparatus shall be in accordance with theApparatussection of Test Methods D1646.1These test methods are under the jurisdiction of ASTM Committee D11 onRubber and Rubber-like Materials and are the direct responsibility of SubcommitteeD11.12 on Processability Tests.Current edition approved Oct.1,2022.Published October 2022.Originallyapproved in 1974.Last previous edition approved in 2017 as D3346 17.DOI:10.1520/D3346-17R22.2For 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.16.2 The large rotor shall be used.7.Sample Preparation7.1 For sampling procedure,refer to Practice D3896.7.2 The tests can be performed using specimens taken fromeither massed or unmassed samples.Better repeatability withinlabs and reproducibility between labs is normally obtained onunmassed samples.However,the sample may be massed toexpel air,to consolidate particles,or to modify it,if