Designation:D2639/D2639M−13StandardTestMethodforPlasticPropertiesofCoalbytheConstant-TorqueGieselerPlastometer1ThisstandardisissuedunderthefixeddesignationD2639/D2639M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversarelativemeasureoftheplasticbehaviorofcoalwhenheatedunderprescribedconditions.Thistestmethodmaybeusedtoobtainsemiquantitativevaluesoftheplasticpropertiesofcoalsandblendsusedincarbonizationandinothersituationswheredeterminationofplasticbehaviorofcoalsisofpracticalimportance.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2013/D2013MPracticeforPreparingCoalSamplesforAnalysisD2234/D2234MPracticeforCollectionofaGrossSampleofCoal3.Terminology3.1Definitions:3.1.1breaking,v—freespinningbehaviorofcoal,eitherbyanabruptchangetorotatingatmaximummotorspeedorbyabruptchangesinrotation,whichoccursasaresultofamoltenballofcoalformingaroundthebaseofthestirrer,andwhichmakesreportingofthetruemaximumfluidityofthecoaldifficult.3.1.2dialdivisionperminute,n—asusedinthistestmethod,ameasureofstirrerrotationrate.Thereare100dialdivisionsforeachfull360°rotationofthestirrer.Stirrerrotationrateistotaldialdivisionsturnedbythestirrerinaoneminutetimeperiod.3.1.3initialsofteningtemperature,n—asusedinthistestmethod,thetemperatureatwhichthestirrerrotationra...
