Designation:B685−01(Reapproved2012)StandardSpecificationforPalladium-CopperElectricalContactMaterial1ThisstandardisissuedunderthefixeddesignationB685;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thisspecificationcoversa60%palladium-40%copperalloyintheformofrod,wire,strip,andsheetmaterialforelectricalcontacts.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.ItistheresponsibilityoftheuserofthisstandardtobecomefamiliarwithallhazardsincludingthoseidentifiedintheappropriateMaterialSafetyDataSheet(MSDS)forthisproduct/materialasprovidedbythemanufacturer,toestablishappropriatesafetyandhealthpractices,anddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B476SpecificationforGeneralRequirementsforWroughtPreciousMetalElectricalContactMaterials3.Manufacture3.1Rawmaterialsshallbeofsuchqualityandpuritythatthefinishedproductwillhavethepropertiesandcharacteristicsprescribedinthisspecification.3.2Thematerialshallbefinishedbysuchoperations(coldworking,annealing,turning,grinding,orpickling)asarerequiredtoproducetheprescribedproperties.4.ChemicalComposition4.1MaterialproducedunderthespecificationshallmeettherequirementsofchemicalcompositionprescribedinTable1.4.2Byagreementbetweenpurchaserandmanufacturer,analysismayberequiredandlimitsestablishedforelementsorcompoundsnotspecifiedinthetableofchemicalcomposition.5.MechanicalRequirements5.1Thecontractorordermayspecifyultimatetensilestrength,elongation,microhardness(KnooporVickers),hard-n...
