Designation:D4055−04(Reapproved2013)StandardTestMethodforPentaneInsolublesbyMembraneFiltration1ThisstandardisissuedunderthefixeddesignationD4055;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofpentaneinsolublesforparticlesexceeding0.8µminnewandusedlubricatingoils.NOTE1—Pentaneinsolubleswithparticlesizeslessthan0.8µmmaybestudiedwithappropriatesizemembranefilters.Particlesizesaboveorbelow0.8µmcanbestudied.Theprecisionofthistestmethodhasbeendeterminedonlyat0.8µm.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.FORSPECIFICWARNINGSTATEMENTS,SEE7.1,8.2.1,ANDANNEXA1.2.ReferencedDocuments2.1ASTMStandards:2D4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4175TerminologyRelatingtoPetroleum,PetroleumProducts,andLubricantsD4177PracticeforAutomaticSamplingofPetroleumandPetroleumProducts3.Terminology3.1Definitions:3.1.1pentaneinsolubles,inusedoilanalysis,n—separatedmatterresultingwhenausedoilisdissolvedinpentane.3.1.1.1Discussion—Inthistestmethod,theseparationiseffectedbyfiltrationthroughamembrane.3.1.2usedoil,n—anyoilthathasbeeninapieceofequipment(forexample,anengine,gearbox,transformer,orturbine)whetheroperatedornot.D41754.SummaryofTestMethod4.1Asampleofneworusedlubricatingoilismixedwithpentaneinavolumetricflask.Theoilsolutionisfilteredthroughan0.8-µmmembranefilter.Theflask,funnel,andfilterarewashedwithadditionalpentanetoeffectacompletetransferofparticulatesontothefilter.Thefilteranditsparticulatesaredriedand...
