Designation:D5483−05(Reapproved2015)StandardTestMethodforOxidationInductionTimeofLubricatingGreasesbyPressureDifferentialScanningCalorimetry1ThisstandardisissuedunderthefixeddesignationD5483;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofoxidationinductiontimeoflubricatinggreasessubjectedtooxygenat3.5MPa(500psig)andtemperaturesbetween155°Cand210°C.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E473TerminologyRelatingtoThermalAnalysisandRhe-ology3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1extrapolatedonsettime,n—atimedeterminedonathermalcurve,astheintersectionoftheextrapolatedbaselineandalinetangenttotheoxidationexothermconstructedatitsmaximumrate.3.1.2oxidationinductiontime(OIT),n—theperiodoftimefromthefirstexposuretoanoxidizingatmosphereuntiltheextrapolatedonsettime.3.1.3pressuredifferentialscanningcalorimeter,(PDSC),n—adifferentialscanningcalorimeter,asdefinedinTerminol-ogyE473,thatiscapableofmaintainingthetestsampleatacontrolled,elevatedpressure.3.1.4thermalcurve,n—agraphofsampleheatflowversustime.4.SummaryofTestMethod4.1Asmallquantityofgreaseisweighedintoasamplepanandplacedinatestcell.Thecellisheatedtoaspecifiedtemperatureandthenpressurizedwithoxygen.Thecellisheldataregulatedtemperatureandpressureuntilanexothermicreactionoccurs.Theextrapolatedonsettimeismeasuredandreportedastheoxidationinductiontimeforthegreaseunderthespecifiedtesttemperature.4.2Akinet...
