Designation:F2168−13AnAmericanNationalStandardStandardSpecificationforPackingMaterial,Graphitic,CorrugatedRibbonorTexturedTape,andDie-FormedRing1ThisstandardisissuedunderthefixeddesignationF2168;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Scope—Thisspecificationcoversvarioustypes,classes,andgradesofflexiblegraphitematerialinwhichvalvemediatemperaturesarelimitedtoamaximumof966°C.WherethisspecificationisinvokedasASTMF2168,Sections1–18apply.WherethisspecificationisinvokedasASTM/DoDF2168,Sections1–18andtheSupplementaryRequirementsapply.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.2.ReferencedDocuments2.1ASTMStandards:2C559TestMethodforBulkDensitybyPhysicalMeasure-mentsofManufacturedCarbonandGraphiteArticlesC561TestMethodforAshinaGraphiteSampleC816TestMethodforSulfurinGraphitebyCombustion-IodometricTitrationMethodC889TestMethodsforChemicalandMassSpectrometricAnalysisofNuclear-GradeGadoliniumOxide(Gd2O3)PowderD129TestMethodforSulfurinPetroleumProducts(Gen-eralHighPressureDecompositionDeviceMethod)D512TestMethodsforChlorideIonInWaterD1179TestMethodsforFluorideIoninWaterD1246TestMethodforBromideIoninWaterD3178TestMethodsforCarbonandHydrogenintheAnalysisSampleofCoalandCoke(Withdrawn2007)3D3684TestMethodforTotalMercuryinCoalbytheOxygenBombCombustion/AtomicAbsorptionMethod(Withdrawn2014)3D3761TestMethodforTotalFluorineinCoalbytheOxygenBombCombustion/IonSelectiveElectrodeMethodD3951PracticeforCommercialPackagingD4239TestMethodforSulfurintheAnalysisSampleofCoalandCokeUsingHigh-TemperatureTubeFurnaceCombustion3.Terminology3.1Definitions:3.1.1accordioncrease,n—becauseofthemethodofcon-structionofdie-formedrings,anaccordion-likelinearindica-tion(crease)appearsingularlyorinmultiplelocationsaroundth...
