ASTM_D_2603_-_20.pdf

Designation:D260320Standard Test Method forSonic Shear Stability of Polymer-Containing Oils1This standard is issued under the fixed designation D2603;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 method covers the evaluation of the shearstability of an oil containing polymer in terms of the permanentloss in viscosity that results from irradiating a sample of the oilin a sonic oscillator.This test method can be useful inpredicting the continuity of this property in an oil where nochange is made in the base stock or the polymer.It is notintended that this test method serve to predict the performanceof polymer-containing oils in service.1.2 Evidence has been presented that correlation betweenthe shear degradation results obtained by means of sonicoscillation and those obtained in mechanical devices can bepoor.This is especially true in the case of automotive engines.Further evidence indicates that the sonic technique may ratedifferent families of polymers in a different order than me-chanical devices.2,31.3 Because of these limitations,the committee underwhose jurisdiction this test method falls has developed alter-native shear test methods using a diesel injector nozzle,TestMethods D5275,D6278,and D7109.While those test methodshave found some utility in the evaluation of crankcase oils,thestress imparted to the sample has been found to be insufficientto shear polymers of the shear-resistant type found in aircrafthydraulic fluids.1.4 This test method is used for polymeric additivespecifications,especially in the hydraulic fluid market.1.5 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.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:4D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D5275 Test Method for Fuel Injector Shear Stability Test(FISST)for Polymer Containing FluidsD6022 Practice for Calculation of Permanent Shear StabilityIndexD6278 Test Method for Shear Stability of Polymer Contain-ing Fluids Using a European Diesel Injector ApparatusD7042 Test Method for Dynamic Viscosity and Density ofLiquids by Stabinger Viscometer(and the Calculation ofKinematic Viscosity)D7109 Test Method for Shear Stability of Polymer-Containing Fluids Using a European Diesel Injector Ap-paratus at 30 Cycles and 90 Cycles3.Summary of Test Method3.1 A convenient volume of polymer-containing oil is irra-diated in a sonic oscillator for a period of time and the changesin viscosity are determined by Test Method D445 and D7042.Standard reference fluids containing either a readily sheared orshear-resistant polymer are run frequently to ensure that theequipment imparts a controlled amount of sonic energy to thesample.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 May 1,2020.Published May 2020.Originallyapproved in 1967.Last previous edition approved in 2019 as D2603 19.DOI:10.1520/D2603-20.2The Effects of Polymer Degradation on Flow Properties of Fluids andLubricants,ASTM STP 382,ASTM,1965.Available fromASTM Headquarters,100Barr Harbor Drive,West Conshohocken,PA 19428,www.astm.org.3Shear Stability of Multigrade Crankcase Oil,ASTM DS 49,ASTM,1973.Available from ASTM Headquarters,100 Barr Harbor Drive,West Conshohocken,PA 19428,www.astm.org.4For 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.*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 standa