Designation:D7109−18StandardTestMethodforShearStabilityofPolymer-ContainingFluidsUsingaEuropeanDieselInjectorApparatusat30Cyclesand90Cycles1ThisstandardisissuedunderthefixeddesignationD7109;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoverstheevaluationoftheshearstabilityofpolymer-containingfluids.Thetestmethodmea-surestheviscosityloss,inmm2/sandpercent,at100°Cofpolymer-containingfluidswhenevaluatedbyadieselinjectorapparatusprocedurethatusesEuropeandieselinjectortestequipment.Theviscositylossreflectspolymerdegradationduetoshearatthenozzle.Viscositylossisevaluatedafterboth30cyclesand90cyclesofshearing.NOTE1—Thistestmethodevaluatestheshearstabilityofoilsafterboth30cyclesand90cyclesofshearing.Formostoils,thereisacorrelationbetweenresultsafter30cyclesandresultsafter90cyclesofshearing,butthisisnotuniversal.NOTE2—TestMethodD6278usesessentiallythesameprocedurewith30cyclesonlyinsteadofboth30cyclesand90cycles.Thecorrelationbetweenresultsfromthistestmethodat30cyclesandresultsfromTestMethodD6278hasnotbeenestablished.NOTE3—TestMethodD2603hasbeenusedforsimilarevaluationofshearstability;limitationsareasindicatedinthesignificancestatement.Nodetailedattempthasbeenundertakentocorrelatetheresultsofthistestmethodwiththoseofthesonicsheartestmethod.NOTE4—ThistestmethodusestestapparatusasdefinedinCECL-14-A-93.ThistestmethoddiffersfromCEC-L-14-A-93intheperiodoftimerequiredforcalibration.NOTE5—TestMethodD5275alsoshearsoilsinadieselinjectorapparatusbutmaygivedifferentresults.NOTE6—ThistestmethodhasdifferentcalibrationandoperationalrequirementsthanwithdrawnTestMethodD3945.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurport...
