Designation:D7633−13StandardTestMethodforCarbonBlack—CarbonContent1ThisstandardisissuedunderthefixeddesignationD7633;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheinstrumentaldeterminationofcarboncontentinacarbonblacksample.Valuesobtainedrepresentthetotalcarboncontent.1.2Themethodisapplicabletotread,carcassandspecialtytypecarbonblacksobtainedfrompartialcombustionorther-maldecompositionprocesses,whichtypicallycontain95to100%carbon.1.3Theresultsofthesetestscanbeexpressedasmass%carbon.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1799PracticeforCarbonBlack—SamplingPackagedShipmentsD1900PracticeforCarbonBlack—SamplingBulkShip-mentsD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries3.SummaryofTestMethod3.1Inthistestmethod,asampleisweighedinacombustionboatandthecarboncontentisdeterminedbyplacingtheboatinatubefurnaceoperatingat1350°Cinastreamofoxygenresultingincompletecombustion.Carboninthesampleisoxidizedtocarbondioxide.Moistureandparticulatesareremovedfromthegasstreambytrapsfilledwithanhydrousmagnesiumperchlorate.Thegasstreamisthenpassedthroughacellinwhichcarbondioxideconcentrationismeasuredbyaninfrared(IR)absorptiondetectorataprecisewavelengthintheIRspectrum.3.2Thistestmethodisforusewithcommerciallyavailablecarbonanalyzersequippedtocarryoutthecombustionandmeasurementoperationsautomatically.3.3Thecarbonanalyzermustbecalibratedusinganappr...
