Designation:D6559−00a(Reapproved2010)StandardTestMethodforDeterminationofThermogravimetric(TGA)AirReactivityofBakedCarbonAnodesandCathodeBlocks1ThisstandardisissuedunderthefixeddesignationD6559;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthethermogravimetric(TGA)determinationofairreactivityanddustingofshapedcarbonanodesandcathodeblocksusedinthealuminumreductionindustry.Theapparatusselectioncoversasignificantvarietyoftypeswithvariousthermalconditions,samplesizecapability,materialsofconstruction,andproceduresfordeterminingthemasslossandsubsequentrateofreaction.Thistestmethodstandardizesthevariablesofsampledimensions,reactiontemperature,gasvelocityovertheexposedsurfaces,andreactiontimesuchthatresultsobtainedondifferentapparatusesarecorrelatable.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D6353GuideforSamplingPlanandCoreSamplingforPrebakedAnodesUsedinAluminumProductionD6354GuideforSamplingPlanandCoreSamplingofCarbonCathodeBlocksUsedinAluminumProductionE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1dusting,n—thequantityofcarbonthatfallsoffthecarbonartifactwhileinthereactionchamberandiscollectedinthecontaineratthebottomofthereactionchamber.3.1.2finalairreactivity,n—themasslossofthecarbonartifactduringthefinal30minofexposuretoairinthereactionchamberdividedbytheinitialgeometric(rightcylindrical)expo...
