Designation:D4310−20aStandardTestMethodforDeterminationofSludgingandCorrosionTendenciesofInhibitedMineralOils1ThisstandardisissuedunderthefixeddesignationD4310;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversandisusedtoevaluatethetendencyofinhibitedmineraloilbasedsteamturbinelubri-cantsandmineraloilbasedanti-wearhydraulicoilstocorrodecoppercatalystmetalandtoformsludgeduringoxidationinthepresenceofoxygen,water,andcopperandironmetalsatanelevatedtemperature.Thetestmethodisalsousedfortestingcirculatingoilshavingaspecificgravitylessthanthatofwaterandcontainingrustandoxidationinhibitors.NOTE1—Duringroundrobintestingcopperandironintheoil,waterandsludgephasesweremeasured.However,thevaluesforthetotalironwerefoundtobesolow(thatis,below0.8mg),thatstatisticalanalysiswasinappropriate.Theresultsofthecooperativetestprogramareavailable(seeSection16).1.2ThistestmethodisamodificationofTestMethodD943wheretheoxidationstabilityofthesamekindsofoilsisdeterminedbyfollowingtheacidnumberofoil.Thenumberoftesthoursrequiredfortheoiltoreachanacidnumberof2.0mgKOH/gistheoxidationlifetime.1.3ProcedureAofthistestmethodrequiresthedetermina-tionandreportoftheweightofthesludgeandthetotalamountofcopperintheoil,water,andsludgephases.ProcedureBrequiresthesludgedeterminationonly.Theacidnumberdeterminationisoptionalforbothprocedures.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5WARNING—Mercuryhasbeendesignatedbymanyregulatoryagenciesasahazardoussubstancethatcancauseseriousmedicalissues.Mercury,oritsvapor,hasbeendem-onstratedtobehazardoustohealthandcorrosivetomaterials.UseCautionwhenhandlingmercuryandmercury-containingproducts.SeetheapplicableproductSafetyDataSheet(SDS)foradditionalinformation.Thepotentiale...
