Designation:D3313−12StandardTestMethodforCarbonBlack—IndividualPelletHardness1ThisstandardisissuedunderthefixeddesignationD3313;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversamethodformeasuringthehardnessofindividualpelletsofcarbonblack.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1511TestMethodforCarbonBlack—PelletSizeDistri-butionD1799PracticeforCarbonBlack—SamplingPackagedShipmentsD1900PracticeforCarbonBlack—SamplingBulkShip-mentsD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustriesD5230TestMethodforCarbonBlack—AutomatedIndi-vidualPelletHardnessE11SpecificationforWovenWireTestSieveClothandTestSieves3.SummaryofTestMethod3.1Asampleofcarbonblackispassedthroughtwosievestoisolateafractionofuniformsize.Themostsphericalpelletsfromthisportionareselectedandbroughtintocontactwithameasuringdeviceasforceisapplied.Pellethardnessisthemaximumforcerequiredtocrushthepellets.4.SignificanceandUse4.1Pellethardnessisrelatedtoseveralcarbonblackchar-acteristics.Amongthesearemassstrengthandattrition.Thesubsequentlevelofdispersionobtainedinsomemixedcom-poundscontainingthecarbonblackmaybeaffectedbypellethardness.Acceptablepellethardnessmustbeagreedtobytheuserandtheproducer.NOTE1—TestMethodD5230isthepreferredstandardfortestingofindividualpellethardness.ItisrecognizedthatTestMethodD3313reliesonoperatorjudgement,thusaddinganadditionalsourceofvariationforthist...
