Designation:C561−16AnAmericanNationalStandardStandardTestMethodforAshinaGraphiteSample1ThisstandardisissuedunderthefixeddesignationC561;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodprovidesapracticaldeterminationfortheashcontentinagraphitesample.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C562TestMethodforMoistureinaGraphiteSample3.Terminology3.1Definitions:3.1.1ash,n—incarbonandgraphitetechnology,residueremainingafteroxidationofacarbonorgraphite.4.SignificanceandUse4.1Thistestmethodprovidesapracticalestimateofnon-burnableresiduesincommerciallyavailablegraphitematerials.Theashvaluesdeterminedbythistestmethodareofuseincomparingtherelativepurityofvariousgradesofgraphite.Tofacilitateuse,thistestmethodinstitutessimplificationsthatprecludetheabilitytodetermineabsolutelytheashvaluesofthetestgraphitematerialduetouncontrolledsourcesoftracecontamination.4.2Thistestmethodisnotintendedforuseindeterminingtheashcontentofpurifiedgraphites,forexample,nuclearmaterials.Therelationshipbetweenthemineralcontentofagraphitesampleandtheashcontentofthatsampleisunknownandisnotdeterminedbytheapplicationofthistestmethod.5.Interferences5.1Althoughpermittedwithinthescopeofthistestmethod,theuseofaluminaceramiccruciblesmayaffectresultsduetodifficultiesinobtainingrepeatableorproperweights,orboth,becauseof(1)thehygroscopicnatureofsomeceramiccrucibles,and(2...
