Designation:F14−80(Reapproved2015)StandardPracticeforMakingandTestingReferenceGlass-MetalBead-Seal1ThisstandardisissuedunderthefixeddesignationF14;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversproceduresforpreparingandtest-ingreferenceglass-to-metalbead-sealsfordeterminingthemagnitudeofthermalexpansion(orcontraction)mismatchbetweentheglassandmetal.TestsareinaccordancewithTestMethodF218(2).1.2Thispracticeappliestoallglass-metalcombinations,establishedorexperimental,particularlythoseintendedforelectroniccomponents.1.3Thepracticallimitofthetestindevisingmismatchisapproximately300ppm,abovewhichtheglassislikelytofracture.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2F15SpecificationforIron-Nickel-CobaltSealingAlloyF30SpecificationforIron-NickelSealingAlloysF31SpecificationforNickel-Chromium-IronSealingAlloysF79SpecificationforType101SealingGlass2F105SpecificationforType58BorosilicateSealingGlassF218TestMethodforMeasuringOpticalRetardationandAnalyzingStressinGlassF256SpecificationforChromium-IronSealingAlloyswith18or28PercentChromiumF257SpecificationforTwenty-eightPercent(28%)Chromium-IronAlloyforSealingtoGlass(Withdrawn1973)33.SummaryofPractice3.1Sealsofastandardconfigurationarepreparedfromarepresentativesampleofeachmetalandglasstobetested.Eachmaterialispreparedbyanapprovedmethodandsizedasspecified.Thesealisformed,annealed,andmeasuredforopticalretardationfromwhichtheaxialstressandexpansionmismatcharecalculated.Atleasttwospecimensarerequiredfromwhichaveragevaluesareobtained.4.SignificanceandUse4.1Theter...
