ASTM_B_961_-_13.pdf

Designation:B96113Standard Specification forSilver Coated Copper and Copper Alloy StrandedConductors for Electronic Space Application1This standard is issued under the fixed designation B961;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers uninsulated silver-coated softor annealed copper and copper alloy stranded conductors foruse in electronic space application.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.This precautionarycaveat pertains only to Section 9.2.Referenced Documents2.1 ASTM Standards:2NOTE1The following documents of the issue in effect on date ofmaterial purchase form a part of this specification to the extent referencedherein.B193 Test Method for Resistivity of Electrical ConductorMaterialsB258 Specification for Nominal Diameters and Cross-SectionalAreas ofAWG Sizes of Solid Round Wires Usedas Electrical ConductorsB298 Specification for Silver-Coated Soft or Annealed Cop-per WireB286 Specification for Copper Conductors for Use inHookup Wire for Electronic EquipmentB624 Specification for High-Strength,High-ConductivityCopper-Alloy Wire for Electronic ApplicationE3 Guide for Preparation of Metallographic Specimens2.2 European Space Agency(ESA):3ESA/SCC 3901 Generic Specification No.39012.3 European Cooperation for Space Standardization(ECSS):3ECSS-Q-70-20A Determination of the Susceptibility of Sil-ver Plated Copper wire and Cable to“Red Plague”Corrosion3.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size.3.1.2 Customer specification requirements including con-ductor size,designation,and construction.3.1.3 Whether silver-coated copper or silver-coated copper-alloy.3.1.4 Package size(Section 12).3.1.5 Special package marking if required(Section 11),and3.1.6 Place of inspection(Section 10).4.Coating of Wires4.1 Coating ThicknessThe silver coating of wires com-posing stranded conductors shall be uniform such that no areaaround the strand circumference is covered by less than 80micro-inches of silver.Uniform silver coating shall be verifiedby micro-sectioning as outlined in section 9.1.4.1.1 Single points caused by eccentric strands or minutescratches shall not be less than 60 micro-inches minimum orexceed 3 points in number around the micro-sectioned strandcircumference.4.2 The silver coating of wires composing stranded conduc-tors(before and after stranding)shall conform to the polysul-fide test in accordance with Specification B298.4.3 The average silver coating thickness of wires composingstranded conductors shall be verified by electronic determina-tion(Method A)in accordance with Specification B298.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.02 onMethods of Test and Sampling Procedure.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 2008.Last previous edition approved in 2008 as B961 08.DOI:10.1520/B0961-13.2For 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.3ESA Publications Division,ESTEC,P.O.Box 299,2200 AG Noordwijk,TheNetherlands(ESA/SCC 3901 download available from www.escies.org).Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 Red Plague Corrosion TestRepresentative samples ofthe silver coated conductors shall conform to codes 0 3 of theaccelerated corrosion test for un-insulated silver-plated con-ductors as outlined in section 9.2(Explanatory Note 1).5.General Requirements5.1 TemperUnless otherwise specified,all coated conduc-tors shall be furnished in the annealed temper.5.2 ElongationThe elongation of stranded conductorsshall be permitted to vary from the requirements of theapplicable Specifications B298 and B624 by the followingamounts:5.2.1 For stranded silver coated copper conductors 22AWGand smaller,the test shall be performed on the whole conductorand the elongation measured when the first strand of theconduct