1、Designation:D260301(Reapproved 2013)Standard 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 r
2、evision.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.Scope1.1 This test method covers the evaluation of th
3、e 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 polyme
4、r.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 espe
5、cially 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 analte
6、rnative shear test method using a diesel injector nozzle,TestMethod D3945.While that test method has found some utilityin the evaluation of crankcase oils,the stress imparted to thesample has been found to be insufficient to shear polymers ofthe shear-resistant type found in aircraft hydraulic fluid
7、s.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 as thestandard.The values given in parentheses are provided forinformational purposes only.1.6 This standard does not purport to address a
8、ll 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 determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:4D445 Test Method for Ki
9、nematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D3945 Test Method for Sheer Stability of Ploymer-Containing Fluids Using a Diesel Injector Nozzle(With-drawn 1998)5D6022 Practice for Calculation of Permanent Shear StabilityIndex3.Summary of Test Method3.1 A co
10、nvenient 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.Standardreference fluids containing either a readily sheared or shear-resistant polymer are run frequently to ensure that the equip-ment
11、imparts a controlled amount of sonic energy to thesample.NOTE1The conditions to obtain the data for the precision statementwere a 30mL sample,10 min,and at 0C.4.Significance and Use4.1 This test method permits the evaluation of shear stabilitywith minimum interference from thermal and oxidative fact
12、orswhich may be present in some applications.Within thelimitations expressed in the scope of this test method,it hasbeen successfully applied to hydraulic fluids,transmissionfluids,tractor fluids,and other fluids of similar applications.Ithas been found applicable to fluids containing both readilysh
13、eared and shear-resistant polymers.Correlation with perfor-mance in the case of automotive engine applications has,todate,not been established.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricantsand is the direct responsibility ofSubcommi
14、ttee D02.07 on Flow Properties.Current edition approved May 1,2013.Published August 2013.Originallyapproved in 1967.Last previous edition approved in 2007 as D2603 01(2007).DOI:10.1520/D2603-01R13.2The Effects of Polymer Degradation on Flow Properties of Fluids andLubricants,ASTM STP 382,ASTM,1965.A
15、vailable 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 w
16、ebsite,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.5The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Apparatus5.1 Sonic Shear Unit,fixed frequency oscillator and sonichorn.5.2 AuxiliaryEquipmentTofacilitateuniformperfo
