Designation:D8253−21StandardTestMethodforDeterminationoftheAsphalteneSolvencyPropertiesofBitumen,CrudeOil,Condensateand/orRelatedProductsforthePurposeofCalculatingStability,CompatibilityforBlending,Fouling,andProcessibility(ManualMicroscopyMethod)1ThisstandardisissuedunderthefixeddesignationD8253;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoverstheuseofabasicmicroscopetodeterminetheasphaltenesolvencypropertiesofbitumen,crudeoil,condensateorrelatedproducts,orthecombinationsthereof.Thesepropertiescanbeusedtocalculatethesolubilityparametersrequiredtocalculateandpredictasphaltenestabil-ityforblendingpurposes,refineryunitfouling,processibility,emulsionstabilization,pipelineandtankdeposition,andequip-mentfouling.Ifthesolubilitypropertiesareknownfortwoproducts,thenthecompatibilityofpotentialblendratioscanbepredicted.1.2Thistestmethodislimitedtoproductsthatallowhandlingatatmosphericpressureandroomtemperaturecon-ditionswithoutasignificantlossoflightendcomponents.Lossoflightendswillresultinchangesinthesolubilitypropertiesoftheproductandmayalterorbiastheresults,orboth.Sampleswithvaporpressures(VPCR4at37.8°CusingTestMethodD6377)greaterthan100kPaarenotsuitableforusewiththistestmethod.1.3Thistestmethodisprimarilysuitedtoproductsthatarefreelyflowingattestconditions.Samplesthataretooviscoustoflowattestconditions,suchassemi-solids,mayneedtobeheatedtoallowhandling(SeeAnnexA1.)1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofr...
