Designation:F29−97(Reapproved2012)StandardSpecificationforDumetWireforGlass-to-MetalSealApplications1ThisstandardisissuedunderthefixeddesignationF29;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversround,copper-coated42%nickel-ironwire,commonlyknownasdumet,intendedprimar-ilyforsealingtosoftglass.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B170SpecificationforOxygen-FreeElectrolyticCopper—RefineryShapesD1535PracticeforSpecifyingColorbytheMunsellSystemD1729PracticeforVisualAppraisalofColorsandColorDifferencesofDiffusely-IlluminatedOpaqueMaterialsE3GuideforPreparationofMetallographicSpecimensE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE53TestMethodforDeterminationofCopperinUnalloyedCopperbyGravimetryE228TestMethodforLinearThermalExpansionofSolidMaterialsWithaPush-RodDilatometerF14PracticeforMakingandTestingReferenceGlass-MetalBead-Seal3.OrderingInformation3.1Thewireisusuallysuppliedwithasurfacecoatingconsistingofamixtureofcopperoxidesandfusedsodiumtetraborate(borax)whichretardsoxidationofthewireduringsealinginglassandfurtheraidswettingofthewirebytheglass.Thecompositewiremayalsobepurchasedasbarewireforspecificapplications.3.2Thesizeofthewire,ifapplicable,theboratecolorrangedesignatedaslight,medium(regular),ordark,shallbespecifiedoneachpurchaseorder.3.3Packagesizesshallbeagre...
