Designation:D3279−12StandardTestMethodforn-HeptaneInsolubles1ThisstandardisissuedunderthefixeddesignationD3279;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversdeterminationofthemasspercentofasphaltenesasdefinedbyinsolubilityinnormal-heptanesolvent.Itisapplicabletoallsolidandsemi-solidpetroleumasphaltscontaininglittleornomineralmatter,togasoils,toheavyfueloils,andtocrudepetroleumthathasbeentoppedtoacut-pointof343°Corhigher.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.SeeSection7foraspecifichazardstatement.2.ReferencedDocuments2.1ASTMStandards:2C670PracticeforPreparingPrecisionandBiasStatementsforTestMethodsforConstructionMaterials3.SummaryofTestMethod3.1Thesampleisdispersedinn-heptaneandfilteredthroughaglass-fiberpad.Theinsolublematerialiswashed,dried,andweighed.4.SignificanceandUse4.1Thistestmethodisusefulinquantifyingtheasphaltenecontentofpetroleumasphalts,gasoils,heavyfueloils,andcrudepetroleum.Asphaltenecontentisdefinedasthosecom-ponentsnotsolubleinn-heptane.5.ApparatusandMaterials5.1TheassemblyofthedispersingapparatusisillustratedinFig.1withdetailsofthecomponentpartsasfollows:5.1.1ErlenmeyerFlask,of250-mLcapacityadaptedtoanAllihn-typerefluxcondenser.5.1.2MagneticStirrerandMagnetic-StirrerHotPlate5.1.3BitumenCrucibleorGoochCrucible,glazedinsideandoutsidewiththeexceptionoftheoutsidebottomsurface.Theapproximatedimensionsshallbeadiameterof44mmatthetoptaperingto36mmatthebottomandadepthof20–30mm.5.1.4GlassMicrofiberFilterPad,32–...
