1、Designation:D6278121Standard Test Method forShear Stability of Polymer Containing Fluids Using aEuropean Diesel Injector Apparatus1This standard is issued under the fixed designation D6278;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revis
2、ion,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.1NOTEEditorial changes made to 3.2.1 and Section 10 in April 2013.1.Scope*1.1 This test method covers the evaluation o
3、f the shearstability of polymer-containing fluids.The test method mea-sures the percent viscosity loss at 100C of polymer-containingfluids when evaluated by a diesel injector apparatus procedurethat uses European diesel injector test equipment.The viscosityloss reflects polymer degradation due to sh
4、ear at the nozzle.NOTE1Test Method D2603 has been used for similar evaluation ofshear stability;limitations are as indicated in the significance statement.No detailed attempt has been undertaken to correlate the results of this testmethod with those of the sonic shear test method.NOTE2This test meth
5、od uses test apparatus as defined in CECL-14-A-93.This test method differs from CEC-L-14-A-93 in the period oftime required for calibration.NOTE3Test Method D5275 also shears oils in a diesel injectorapparatus but may give different results.NOTE4This test method has different calibration and operati
6、onalrequirements than withdrawn Test Method D3945.NOTE5Test Method D7109 is a similar procedure that measures shearstability at both 30 and 90 injection cycles.This test method uses 30injection cycles only.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with
7、 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.Specific precau-tionary statements are given in Section 8.2.Referenced Documents2.1 ASTM Standards:2D445 Test Me
8、thod for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D2603 Test Method for Sonic Shear Stability of Polymer-Containing OilsD5275 Test Method for Fuel Injector Shear Stability Test(FISST)for Polymer Containing FluidsD6299 Practice for Applying Statistica
9、l Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD7109 Test Method for Shear Stability of Polymer Contain-ing Fluids Using a European Diesel Injector Apparatus at30 and 90 Cycles2.2 Coordination European Council(CEC)Standard:3CEC L-14-A-93 Evalua
10、tion of the Mechanical Shear Sta-bility of Lubricating Oils Containing Polymers3.Terminology3.1 Definitions:3.1.1 kinematic viscosity,na measure of the resistance toflow of a fluid under gravity.3.2 Definitions of Terms Specific to This Standard:3.2.1 calibration pressure,nthe recorded gauge pressur
11、ewhen calibration fluid RL233 undergoes a viscosity loss of 2.7to 2.9 mm2/s when the recorded gauge pressure is within therange of 13.0 to 18.0 MPa.3.2.2 percent viscosity loss,nviscosity loss,as defined in3.2.3,divided by the pre-sheared viscosity,and reported as apercent.3.2.3 viscosity loss,nthe
12、loss in viscosity determined fromthe difference in kinematic viscosity at 100C of pre-shearedand post-sheared fluid.4.Summary of Test Method4.1 A polymer-containing fluid is passed through a dieselinjector nozzle at a shear rate that causes polymer molecules todegrade.The resultant degradation reduc
13、es the kinematicviscosity of the fluid under test.The percent viscosity loss is ameasure of the mechanical shear stability of the polymer-containing fluid.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibili
14、ty ofSubcommittee D02.07 on Flow Properties.Current edition approved Nov.1,2012.Published February 2013.Originallyapproved in 1998.Last previous edition approved in 2007 as D627807.DOI:10.1520/D6278-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service
15、 at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from CEC Secretariat,Interlynk Administrative Services,Ltd.,LynkHouse,17 Peckleton Lane,Desford,Leicestershire,LE9 9JU,United Kingdom.*A Summary of Chang
16、es section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 This test method evaluates the percent viscosity loss forpolymer-containing fluids resulting from polymer degradationin the high shear nozzle device.Thermal or oxidative effectsare minimized.5.2 This test method is used for quality control purposes bymanufacturers of polymeric lubricant additives and their cus-tomers
