ASTM_F_79_-_69_2015.pdf

Designation:F7969(Reapproved 2015)Standard Specification forType 101 Sealing Glass1This standard is issued under the fixed designation F79;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers Type 101 sealing glass for usein electronic applications.NOTE1This specification is primarily intended to consider glass asmost generally used,this is,glass in its transparent form as normallyencountered in fabricating electronic devices.X1.3 lists sealing metals andalloys that are compatible with this glass.Type 101 glass in other formssuch as powdered,crushed,sintered,fibrous,etc.are excluded.Therequirements of this specification,as applied to these forms,must beestablished in the raw glass prior to its conversion.2.Referenced Documents2.1 ASTM Standards:2C336 Test Method for Annealing Point and Strain Point ofGlass by Fiber ElongationC338 Test Method for Softening Point of GlassC598 Test Method for Annealing Point and Strain Point ofGlass by Beam BendingD150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE228 Test Method for Linear Thermal Expansion of SolidMaterials With a Push-Rod DilatometerF14 Practice for Making and Testing Reference Glass-MetalBead-SealF140 Practice for Making Reference Glass-Metal Butt Sealsand Testing for Expansion Characteristics by PolarimetricMethodsF144 Practice for Making Reference Glass-Metal SandwichSeal and Testing for Expansion Characteristics by Polari-metric Methods3.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Form,3.1.2 Type of glass,3.1.3 Dimensions,3.1.4 Marking and packaging,and3.1.5 Certification(if required).4.Chemical Composition4.1 The typical chemical composition of this glass is asfollows(Note 2):Major ConstituentsWeight%Silica(SiO2)56.0Alumina(Al2O3)1.5Soda(Na2O)4.0Potash(K2O)8.5Lead oxide(PbO)29.0Antimony trioxide(Sb2O3)1.0,maxArsenic trioxide(As2O3)1.0,maxHalogens0.2,maxNOTE2Major constituents may be adjusted to give the desiredelectrical and physical properties to the glass.However,no change shall bemade that alters any of these properties without due notification of,andapproval by,the user.5.Physical Properties5.1 The material shall conform to the physical propertiesprescribed in Table 1.For electrical properties see Table 2 andits Footnote A.6.Workmanship,Finish,and Appearance6.1 The glass shall have a finish that ensures smooth,evensurfaces and freedom from cracks,checks,bubbles,and otherflaws of a character detrimental to the strength or life of thecomponent or device for which its use is intended.7.Test Methods7.1 Softening PointSee Test Method C338.7.2 Annealing PointSee Test Methods C336 or C598.7.3 Thermal Expansion CoeffcientPretreat the specimenby heating to 10C above the annealing point and hold it at thattemperature for 15 min;then cool it from that temperature to1This specification is under the jurisdiction of ASTM Committee C14 on Glassand Glass Products and is the direct responsibility of Subcommittee C14.04 onPhysical and Mechanical Properties.Current edition approved May 1,2015.Published May 2015.Originallyapproved in 1967.Last previous edition approved in 2010 as F79 69(2010).DOI:10.1520/F0079-69R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 100C at a rate of 2 to 5C/min.The cooling rate below 100Cis optional.Place the specimen in the dilatometer and deter-mine the mean coefficient of linear thermal expansion for the 0to 300C range in accordance with ProcedureAof Test MethodE228.7.4 Contraction CoeffcientHeat the specimen in a vitre-ous silica dilatometer to 20C above the annealing point andhold it at that temperature for 15 min;then cool at a rate offrom 1.0 to 1.5C/min to a temperature below 200C.The rateof cooling from the point below 200 to 100C shall not exceed5C/min.The rate of cooling from 100C to room temperatureis optional.During this cooling schedule,determine the ther-mal contraction curve and calculate the mean coefficient oflinear thermal contraction between a point 15C below theannealing point and 30C in accordance with Procedure B ofTest Method E228.7.5 Bead Seal TestThe thermal contraction match betweenthe glass and a sealing alloy may be determined by preparingand testin