Designation:D4821−20StandardGuideforCarbonBlack—ValidationofTestMethodPrecisionandBias1ThisstandardisissuedunderthefixeddesignationD4821;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThisguidecoversproceduresforusingtheASTMStandardReferenceBlacks2(SRBs)andtheHTandINRIodineNumberStandardstocontinuouslymonitorthepreci-sionofthosecarbonblacktestmethodsforwhichreferencevalueshavebeenestablished.Italsooffersguidelinesfortroubleshootingvarioustestmethods.1.2ThisguidedefinestheenvironmentalconditionsthatarerequiredforlaboratoriesthatperformcarbonblacktestingactivitiesforthosetestmethodsunderD24’sjurisdiction.1.3Thisguideestablishesproceduresfortheuseofx-chartstocontinuouslymonitorthosetestslistedinSection2forwithin-labprecision(repeatability)andbetween-labaccuracy(reproducibility).1.4Thisguideprovidesastatisticalprocedureforimprov-ingtestreproducibilitywhenalaboratorycannotphysicallycalibrateitsapparatustoobtainthereferencevaluesoftheASTMreferenceblacks,withintherangesgiveninthisguide.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3D1510TestMethodforCarbonBlack—IodineAdsorptionNumberD1513TestMethodforCarbonBlack,Pelleted—PourDen-sityD1765ClassificationSystemforCarbonBlacksUsedinRubberProductsD2414TestMethodforCarbonBlack—OilAbsorptionNumber(OAN)D3265TestMethodforCarbonBlack—TintStrengthD3324PracticeforCarbonBlack—ImprovingTestRepro-ducibilityUsingASTMStandardReferenceBlacks(With-drawn2002)4D3493TestMethodforCarbonBlack—OilAbsorptionNumberofCompressedSample(COAN)D6556TestMet...
