ASTM_D_4741_-_21.pdf

Designation:D474121Standard Test Method forMeasuring Viscosity at High Temperature and High ShearRate by Tapered-Plug Viscometer1This standard is issued under the fixed designation D4741;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.Scope*1.1 This test method2covers the laboratory determination ofthe viscosity of oils at 150 C and 1 106s1and at 100 C and1 106s1,using high shear rate tapered-plug viscometermodels BE/C or BS/C.1.2 Newtonian calibration oils are used to adjust the work-ing gap and for calibration of the apparatus.These calibrationoils cover a range from approximately 1.4 mPas to 5.9 mPas(cP)at 150 C and 4.2 mPas to 18.9 mPas(cP)at 100 C.Thistest method should not be used for extrapolation to higherviscosities than those of the Newtonian calibration oils used forcalibration of the apparatus.If it is so used,the precisionstatement will no longer apply.The precision has only beendetermined for the viscosity range 1.48 mPas to 5.07 mPas at150 C and from 4.9 mPas to 11.8 mPas at 100 C for thematerials listed in the precision section.1.3 A non-Newtonian reference oil is used to check that theworking conditions are correct.The exact viscosity appropriateto each batch of this oil is established by testing on a numberof instruments in different laboratories.The agreed value forthis reference oil may be obtained from the chairman of theCoordinating European Council(CEC)Surveillance Group forCEC L-36-90,or from the distributor.1.4 Applicability to products other than engine oils has notbeen determined in preparing this test method.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard except those noted below.1.5.1 ExceptionThis test method uses the SI unitmillipascal-second(mPas)as the unit of viscosity.(1 cP=1 mPas.)1.6 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.1.7 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:3D4683 Test Method for Measuring Viscosity of New andUsed Engine Oils at High Shear Rate and High Tempera-ture by Tapered Bearing Simulator Viscometer at 150 CD5481 Test Method for Measuring Apparent Viscosity atHigh-Temperature and High-Shear Rate by Multicell Cap-illary ViscometerD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products,Liquid Fuels,and LubricantsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a Material2.2 Coordinating European Council(CEC)Standard:4CEC L-36-90 The Measurement of Lubricant Dynamic Vis-cosity under Conditions of High Shear(Ravenfield)1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.07 on Flow Properties.Current edition approved Jan.1,2021.Published January 2021.Originallyapproved in 1987.Last previous edition approved in 2020 as D4741 20a.DOI:10.1520/D4741-21.2This test method is technically identical to that described in CEC L-36-90(under the jurisdiction of the CEC Engine Lubricants Technical Committee)and inIP 370.3For 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.4Available from Coordinating European Council(CEC),Services provided byKellen Europe,Avenue Jules Bordet 142-1140,Brussels,Belgium,http:/www.cectests.org.*A Summary of Changes section appears at the end of this standardCopyright 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.12.3 Energy Institute:5IP 370 Test Method for the Measurement of LubricantDynamic