Designation:D2797/D2797M−11aStandardPracticeforPreparingCoalSamplesforMicroscopicalAnalysisbyReflectedLight1ThisstandardisissuedunderthefixeddesignationD2797/D2797M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverslaboratoryproceduresforthepreparationofgranularsamplesofbituminouscoalandanthra-citesamplesforexaminationwithamicroscopeusingreflectedlightillumination.Itdoesnotapplytothepreparationoforientedblocksofcoal.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressthesafetyconcernsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2013PracticeforPreparingCoalSamplesforAnalysisD2234/D2234MPracticeforCollectionofaGrossSampleofCoalD2798TestMethodforMicroscopicalDeterminationoftheVitriniteReflectanceofCoalD2799TestMethodforMicroscopicalDeterminationoftheMaceralCompositionofCoalD4596PracticeforCollectionofChannelSamplesofCoalinaMineE11SpecificationforWovenWireTestSieveClothandTestSieves3.SummaryofPractice3.1Arepresentativesampleiscrushedtoaspecifiedparticlesize,air-dried,mixedwithabinder,andformedintoabriquet.Thebriquetisthenpolishedtoaflat,scratch-freesurfaceforexaminationbyverticalillumination.4.SignificanceandUse4.1Briquetsofgranularbituminouscoalsandanthracitepreparedinaccordancewiththelaboratoryproceduresofthispracticewillhaveflat,scratch-freesurfacessuitableforexami-nationwithamicroscopeusingreflectedlightillumination.T...
