Designation:D1618−99(Reapproved2011)StandardTestMethodforCarbonBlackExtractables—TransmittanceofTolueneExtract1ThisstandardisissuedunderthefixeddesignationD1618;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofthedegreeoftoluenediscolorationbycarbonblackextractablesandisusefulincontrollingthereactionprocessesforproductionofcarbonblack.Thistestmethodmaynotbeapplicabletocarbonblackswithhighextractables.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1799PracticeforCarbonBlack—SamplingPackagedShipmentsD1900PracticeforCarbonBlack—SamplingBulkShip-mentsD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries3.Terminology3.1Definitions:3.1.1carbonblacktoluenediscoloration,n—thetransmit-tance,at425nm,ofthefiltrateobtainedfromthetolueneextractofcarbonblack,comparedtothatofpuretoluene.4.SignificanceandUse4.1Thetoluenediscolorationvalueprovidesanestimateoftoluene-solublediscoloringresiduespresentonthecarbonblack.5.ApparatusandReagent5.1Spectrophotometer,withtungstenfilamentlamp,20-nmmaximumspectralbandpass,capableofmeasuringpercenttransmittanceata425-nmwavelength.Theinstrumentistobeoperatedinaccordancewiththemanufacturer’sdirectionsforoptimumperformance.5.2Cuvets,rectangular,withanopticallightpathof10mm.5.3Balance,analytical,withasensitivityof60.01g.5.4Oven,gravity-convectiontype,capabletemperatureregulationwithin61°Cat125°Candtemperatu...
