Designation:D6854−15aStandardTestMethodforSilica—OilAbsorptionNumber(OAN)1ThisstandardisissuedunderthefixeddesignationD6854;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheoilabsorptionnumber(OAN)ofsilica.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1799PracticeforCarbonBlack—SamplingPackagedShipmentsD1900PracticeforCarbonBlack—SamplingBulkShip-mentsD2414TestMethodforCarbonBlack—OilAbsorptionNumber(OAN)D6738TestMethodforPrecipitatedSilica—VolatileCon-tentE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.SummaryofTestMethod3.1Inthistestmethod,oilisaddedbymeansofaconstant-rateburettetoasampleofsilicainthemixerchamberofanabsorptometer.Asthesampleabsorbstheoil,themixturechangesfromafree-flowingstatetooneofasemiplasticagglomeration,withanaccompanyingincreaseinviscosity.Thisincreasedviscosityistransmittedtothetorque-sensingsystemoftheabsorptometer.Thetestisstoppedwhenatorquelevelhasbeenreached.Preferablythetorqueversusvolumeofoilisrecordedbyapenwriterorbyadataacquisitionsystemallowingareliabledeterminationoftheendpoint.Thevolumeofoilperunitmassofsilicaistheoilabsorptionnumber(OAN).4.SignificanceandUse4.1Theoilabsorptionnumberofaspecificsilicaisrelatedtotheprocessingandvulcanizatepropertiesofrubbercom-poundscontainingthesilica.5.Apparatus35.1Balance,analytical,withasensitivityof0...
