Designation:D4821−15StandardGuideforCarbonBlack—ValidationofTestMethodPrecisionandBias1ThisstandardisissuedunderthefixeddesignationD4821;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThisguidecoversproceduresforusingtheASTMStandardReferenceBlacks2(SRBs)andtheHTandINRIodineNumberStandardstocontinuouslymonitorthepreci-sionofthosecarbonblacktestmethodsforwhichreferencevalueshavebeenestablished.Italsooffersguidelinesfortroubleshootingvarioustestmethods.1.2Thisguideestablishesproceduresfortheuseofx-chartstocontinuouslymonitorthosetestslistedinSection2forwithin-labprecision(repeatability)andbetween-labaccuracy(reproducibility).1.3Thisguideprovidesastatisticalprocedureforimprov-ingtestreproducibilitywhenalaboratorycannotphysicallycalibrateitsapparatustoobtainthereferencevaluesoftheASTMreferenceblacks,withintherangesgiveninthisguide.2.ReferencedDocuments2.1ASTMStandards:3D1510TestMethodforCarbonBlack—IodineAdsorptionNumberD1513TestMethodforCarbonBlack,Pelleted—PourDen-sityD1765ClassificationSystemforCarbonBlacksUsedinRubberProductsD2414TestMethodforCarbonBlack—OilAbsorptionNumber(OAN)D3265TestMethodforCarbonBlack—TintStrengthD3324PracticeforCarbonBlack—ImprovingTestRepro-ducibilityUsingASTMStandardReferenceBlacks(With-drawn2002)4D3493TestMethodforCarbonBlack—OilAbsorptionNumberofCompressedSample(COAN)D6556TestMethodforCarbonBlack—TotalandExternalSurfaceAreabyNitrogenAdsorptionE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE2282GuideforDefiningtheTestResultofaTestMethodE2586PracticeforCalculatingandUsingBasicStatistics3.Terminology3.1Definitions:3.1.1acceptedreferencevalue,n—avaluethatservesasanagreed-uponreferenceforcomparison,andwhichisderivedas:(1)atheoreticalorestablishedvalue,basedonscientificprinciples,(2)anassignedorcertifie...
