ASTM_D_6616_-_07_2012.pdf

Designation:D661607(Reapproved 2012)Standard Test Method forMeasuring Viscosity at High Shear Rate by Tapered BearingSimulator Viscometer at 100C1This standard is issued under the fixed designation D6616;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 laboratory determination ofthe viscosity of engine oils at 100C and 1106s1using theTapered Bearing Simulator(TBS)viscometer.2NOTE1This test method is similar to Test Method D4683 which usesthe same TBS viscometer to measure high shear viscosity at 150C.1.2 The Newtonian calibration oils used to establish this testmethod range from approximately 5 to 12 mPas(cP)at 100Cand either the manual or automated protocol was used by eachparticipant in developing the precision statement.The viscosityrange of the test method at this temperature is from 1 mPas(cP)to above 25 mPas(cP),depending on the model of TBS.1.3 The non-Newtonian reference oil used to establish theshear rate of 1106s1for this test method has a viscosity ofapproximately 10 mPas at 100C.1.4 Application to petroleum products other than engine oilhas not been determined in preparing the viscometric informa-tion for 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.This test method uses the milliPascal second(mPas)as the unit of viscosity.This unit is equivalent to the centiPoise(cP),which is shown in parentheses.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 and health practices and to determine theapplicability of regulatory limitations prior to use.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 CD4741 Test Method for Measuring Viscosity at High Tem-perature and High Shear Rate by Tapered-Plug Viscometer3.Terminology3.1 Definitions:3.1.1 density,nmass per unit volume.In the SI,the unit ofdensity is the kilogram per cubic metre.For practical use,thesubmultiple,gram per cubic centimetre,is more convenient.The density in gram per cubic centimetre is equal to 1/1000 thedensity in kg/m3.3.1.2 Newtonian oil or fluid,nan oil or fluid that at a giventemperature exhibits a constant viscosity at all shear rates orshear stresses.3.1.3 non-Newtonian oil or fluid,nan oil or fluid thatexhibits a viscosity that varies with changing shear stress orshear rate.3.1.4 shear rate,nthe velocity gradient in fluid flow.TheSI unit for shear rate is s1.3.1.5 shear stress,nthe motivating force per unit area forfluid flow.The area is the area under shear.The SI unit forshear stress is the Pa.3.1.6 viscosity,nthe ratio between the applied shear stressand the rate of shear.It is sometimes called the coefficient ofdynamic viscosity.This coefficient is a measure of the resis-tance to flow of the liquid.In the SI,the unit of viscosity is thePascalsecond;often the milliPascalsecond or its equivalentthe centiPoise is found more convenient.3.1.6.1 apparent viscosity,nthe viscosity of a non-Newtonian fluid at a given shear rate or shear stress determinedby this test method.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.07 on Flow Properties.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 2001.Last previous edition approved in 2007 as D661607.DOI:10.1520/D6616-07R12.2Available from Tannas Co.,4800 James Savage Rd.,Midland,MI 48642.Thisviscometer and associated equipment as listed in the research report was used todevelop the precision statement.To date,no other equipment has demonstrated,throughASTM International interlaboratory testing,the ability to meet the precisionof this test.This is not an endorsement or certification by ASTM International.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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 Definitions of Terms Specific to This Standard:3.2.1 idling oil2,n an oxidatively stable Newtonian oilinjected into the operating viscometer stator when the instru-ment is likely to be held for periods of time greater than 30 minand up to two weeks at 100C.Use of this oil prevents statordeposits from additives,which may decompose after longerexposure times in the op