Designation:D6909−10(Reapproved2016)StandardSpecificationforHighTemperatureandAcid-ResistantFluorocarbonTerpolymerElastomer1ThisstandardisissuedunderthefixeddesignationD6909;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversrequirementsforthefluorocar-bonterpolymerelastomerusedinthemanufactureofexpan-sionjointsforuseincoal-firedutilitiesandotherhightemperatureindustrialapplicationsinwhichcorrosivefluegasesarepresent.1.2Thisspecificationisintendedasareferenceprocedureforevaluatingtheperformanceofthesevulcanizatesandcanalsobeusedforqualityassurancetestingbeforereleaseofalotbasedonagreementbetweensupplierandpurchaser.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatoryrequirementspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D297TestMethodsforRubberProducts—ChemicalAnaly-sisD412TestMethodsforVulcanizedRubberandThermoplas-ticElastomers—TensionD471TestMethodforRubberProperty—EffectofLiquidsD573TestMethodforRubber—DeteriorationinanAirOvenD1765ClassificationSystemforCarbonBlacksUsedinRubberProductsD2240TestMethodforRubberProperty—DurometerHard-ness3.OrderingInformation3.1Thesellershallmentionthisspecificationnumberinallquotationsandwhenacknowledgingpurchaseorder.4.MaterialsandManufacture4.1Materialshallbebasedon100%virginfluoroelastomerterpolymerofatleast68%byweightoffluorinecontent.Thecompoundshallcontainnolessthan70%byweightoffluoroelastomer.Theremaining30%byweightshallbecomprisedofMediumThermal(MT)carbonblack,Classifi-cationN990(inClassificationD1765),asrei...
