Designation:D1646−15StandardTestMethodsforRubber—Viscosity,StressRelaxation,andPre-VulcanizationCharacteristics(MooneyViscometer)1ThisstandardisissuedunderthefixeddesignationD1646;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1ThesetestmethodscoverproceduresformeasuringapropertycalledMooneyviscosity.Mooneyviscosityisdefinedastheshearingtorqueresistingrotationofacylindricalmetaldisk(orrotor)embeddedinrubberwithinacylindricalcavity.Thedimensionsoftheshearingdiskviscometer,testtemperatures,andproceduresfordeterminingMooneyviscos-ityaredefinedinthesetestmethods.1.2Whendiskrotationisabruptlystopped,thetorqueorstressontherotordecreasesatsomeratedependingontherubberbeingtestedandthetemperatureofthetest.Thisiscalled“stressrelaxation”andthesetestmethodsdescribeatestmethodformeasuringthisrelaxation.NOTE1—ViscosityasusedinthesetestmethodsisnotatrueviscosityandshouldbeinterpretedtomeanMooneyviscosity,ameasureofshearingtorqueaveragedoverarangeofshearingrates.StressrelaxationisalsoafunctionofthetestconfigurationandforthesetestmethodstheresultsareuniquetotheMooneyviscometer.1.3WhencompoundedrubberisplacedintheMooneyviscometeratatemperatureatwhichvulcanizationmayoccur,thevulcanizationreactionproducesanincreaseintorque.Thesetestmethodsincludeproceduresformeasuringtheinitialrateofrubbervulcanization.1.4ISO289Parts1and2alsodescribesthedeterminationofMooneyviscosityandpre-vulcanizationcharacteristics.InadditiontoafewinsignificantdifferencestherearemajortechnicaldifferencesbetweenISO289andthistestmethodinthatISO289doesnotprovideforsamplepreparationonamill,whilethistestmethodallowsmillingsamplepreparationinsomecasespriortorunningaMooneyviscositytest.Thiscanresultindifferentviscosityvaluesforso...
