Designation:D3493−16StandardTestMethodforCarbonBlack—OilAbsorptionNumberofCompressedSample(COAN)1ThisstandardisissuedunderthefixeddesignationD3493;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheprocedureforthemechani-calcompressionofacarbonblacksampleandthedetermina-tionoftheoilabsorptionnumberofthecompressedsample.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1765ClassificationSystemforCarbonBlacksUsedinRubberProductsD1799PracticeforCarbonBlack—SamplingPackagedShipmentsD1900PracticeforCarbonBlack—SamplingBulkShip-mentsD2414TestMethodforCarbonBlack—OilAbsorptionNumber(OAN)D4821GuideforCarbonBlack—ValidationofTestMethodPrecisionandBiasD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries3.SummaryofTestMethod3.1Asampleofcarbonblackiscompressedfourtimesinacompressioncylinderatapressureof165MPa(24000psi)andthentestedinanabsorptometertodeterminetheoilabsorptionnumber.3.2n-Dibutylphthalate,paraffin,orEFAoilisaddedbymeansofaconstant-rateburettothecompressedsampleofcarbonblackinthemixerchamberofanabsorptometer.Asthesampleabsorbstheoil,themixturechangesfromafree-flowingstatetooneofasemiplasticagglomeration,withanaccompanyingincreaseinviscosity.Thisincreasedviscosityistransmittedtothetorque-sensingsystemoftheabsorptometer.Whentheviscosityofthemixturereachesapredeterminedtorquelevel,theabsorptometerandburetwillsimultaneouslyshutoff.Thevolumeofo...
