Designation:D5671−95(Reapproved2011)StandardPracticeforPolishingandEtchingCoalSamplesforMicroscopicalAnalysisbyReflectedLight1ThisstandardisissuedunderthefixeddesignationD5671;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverslaboratoryproceduresforpreparinganetched,polishedsurfaceofgranularandblocksamplesofcoalforexaminationwithamicroscopeusingreflectedlightillumination.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D121TerminologyofCoalandCokeD2797PracticeforPreparingCoalSamplesforMicroscopi-calAnalysisbyReflectedLightD2798TestMethodforMicroscopicalDeterminationoftheVitriniteReflectanceofCoalD2799TestMethodforMicroscopicalDeterminationoftheMaceralCompositionofCoalD4596PracticeforCollectionofChannelSamplesofCoalinaMineD5192PracticeforCollectionofCoalSamplesfromCore3.Terminology3.1TerminologyusedinthisstandardcanbefoundinTerminologyD121.4.SummaryofPractice4.1Asubsplitofarepresentativesampleobtainedinaccor-dancewithPracticeD4596andpreparedinaccordancewithPracticeD2797orablockofcoalobtainedinaccordancewithPracticeD5192ispolishedtoaflat,scratch-freesurface,thereflectanceofvitriniteisdeterminedonasubsplitinaccor-dancewithTestMethodD2798,andthenothersubsplitsarechemicallyetchedusinganacidifiedpotassiumpermanganatesolution.5.SignificanceandUse5.1Componentsobservableinsurfacesofcoalsamplespreparedinaccordancewiththelaboratoryproceduresofthispracticewillhavedifferentialreliefthatwillaidintheirmaceralidentifi...
