Designation:D3849−14aStandardTestMethodforCarbonBlack—MorphologicalCharacterizationofCarbonBlackUsingElectronMicroscopy1ThisstandardisissuedunderthefixeddesignationD3849;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcovers(1)themorphological(forexample,sizeandshape)characterizationofcarbonblackfromtransmissionelectronmicroscopeimageswhichareusedtoderivethemeanparticleandaggregatesizeofcarbonblackinthedry(asmanufactured)state,fromCABchipdispersionorremovedfromarubbercompoundand(2)thecertificationofmeanparticlesizeusingacorrelationbasedonstatisticalthicknesssurfaceareameasurements.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3349TestMethodforAbsorptionCoefficientofEthylenePolymerMaterialPigmentedwithCarbonBlackD6556TestMethodforCarbonBlack—TotalandExternalSurfaceAreabyNitrogenAdsorption3.Terminology3.1Definitions:3.1.1General:3.1.1.1carbonblackparticle—asmallspheroidallyshaped,paracrystalline,non-discretecomponentofanaggregate;itcanonlybeseparatedfromtheaggregatebyfracturing;carbonblackparticlesizeisadistributionalproperty;therefore,thetermparticlesizeimpliesthemeanvaluefrommultiplemeasurements.3.1.1.2carbonblackaggregate—adiscrete,rigidcolloidalentitythatisthesmallestdispersibleunit;itiscomposedofextensivelycoalescedparticles;carbonblackaggregatesizeisadistributionalproperty;therefore,thetermaggregatesizeimpliesthemeanvaluefrommultiplemeasurements.3.1.1.3statisticalthicknesssurfacearea(STSA)—theex...
