1、Designation: B971 10Standard Specification forSilver-Coated Braid and Ribbon Flat Copper Wire intendedfor use in Electronic Application1This standard is issued under the fixed designation B971; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 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 silver-coated copper braid andribbon flat wire intended for electroni
3、c application (Explana-tory Note 1).1.2 Two classes of silver-coated braid and ribbon flat copperwire are covered as follows:1.2.1 Class AAnnealed temper.1.2.2 Class HHard-drawn.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalc
4、onversions to SI units that are provided for information onlyand are not considered standard.1.3.1 ExceptionsThe SI values for density, resistivity, andvolume are to be regarded as standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It i
5、s 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.2. Referenced Documents2.1 ASTM Standards:2B1 Specification for Hard-Drawn Copper WireB3 Specification for Soft or Annealed C
6、opper WireB49 Specification for Copper Rod Drawing Stock for Elec-trical PurposesB193 Test Method for Resistivity of Electrical ConductorMaterialsB258 Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Usedas Electrical Conductors2.2 Other Standards:3NBS
7、Handbook 100 Copper Wire Tables3. Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size,3.1.2 Wire size-thickness and width in inches (see 5.4),3.1.3 Class of wire (see 1.2),3.1.4 Type of copper, if special (see 4.2),3
8、.1.5 Package size (see 10.1),3.1.6 Special packaging marking, if required, and3.1.7 Place of inspection (see 7.1).4. Material4.1 The material shall be silver-coated flat wire (Explana-tory Note 1) of such quality and purity that the finished productshall meet the properties and characteristics presc
9、ribed in thisspecification.4.2 Copper-Base MetalThe base metal shall be copper ofsuch quality and purity that the finished product shall haveproperties and characteristics prescribed in this specification.NOTE 1Specifications B1, B3,orB49 define copper suitable for use.5. General Requirements (See S
10、ection 8)5.1 TemperThe silver-coated flat wire conductor shall beprovided in either hard-drawn condition (Class H) or annealedcondition (Class A) as agreed upon between the manufacturerand purchaser.5.2 Tensile and Elongation (Explanatory Note 2):5.2.1 Class AThe silver-coated copper flat wire in th
11、eannealed condition shall conform to the elongation require-ments prescribed in Table 1. See Explanatory Note 3 forequivalent round diameter calculations based on given thick-ness and width dimensions for the flat wire. For flat wire whosenominal equivalent round diameter is more than 0.001 in.(0.02
12、5 mm) greater than a size listed in Table 1, but less thanthat of the next larger size, the requirements of the next largersize shall apply. No requirements for tensile strength arespecified.1This test method is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct r
13、esponsibility of Subcommittee B01.04 onConductors of Copper and Copper Alloys.Current edition approved April 1, 2010. Published May 2010.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume i
14、nformation, refer to the standards Document Summary page onthe ASTM website.3Available from National Technical Information Service (NTIS), 5285 PortRoyal Rd., Springfield, VA 22161, http:/www.ntis.gov.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959
15、, United States.5.2.2 Class HThe silver-coated copper flat wire in thehard-drawn condition shall conform to elongation requirementsof 1% minimum to 5% maximum. The tensile strength shall be55,000 psi (379 MPa) minimum.5.3 Resistivity (Explanatory Note 4)The electrical resis-tivity of the coated wire
16、 at a temperature of 20C shall notexceed the values prescribed in Table 2.5.4 Dimensions and Permissible VariationsThe flat wiresizes shall be expressed as the thickness and width of the wirein decimal fractions of an inch to the nearest 0.0001 in. (0.0025mm). The silver-coated flat wire shall not v
17、ary from thespecified thickness and width by more than the amountsspecified in Table 3 and Table 4, respectively.5.5 Continuity of CoatingThe silver coating shall becontinuous. The continuity of coating on the flat wire shall bedetermined on representative samples taken before braidingapplications o
18、r insulating. The continuity of coating shall bedetermined by the hydrochloric acid-sodium polysulfide test inaccordance with 6.4. Wire whose coating weight correspondsto a thickness less than 40 in. (0.00004 in.) shall not besubject to this test (Explanatory Note 5). The thickness ofcoating shall b
19、e determined in accordance with Test Method Aas prescribed in Appendix X1.5.6 JointsNecessary joints in the wire and rods prior tofinal coating and drawing shall be made in accordance with thebest commercial practice. There shall be no uncoated joints inthe final product.5.7 FinishThe coating shall
20、consist of a smooth continu-ous layer, firmly adherent to the surface of the copper. The wireshall be free of all imperfections not consistent with the bestcommercial practice.6. Test Methods6.1 Tensile Strength and Elongation (Explanatory Note 6):6.1.1 The tensile strength, expressed in pounds per
21、squareinch, shall be obtained by dividing the maximum load carriedby the specimen during the tension test by the originalcross-sectional area of the specimen. Tensile strength andelongation may be determined simultaneously on the samespecimen.6.1.2 The elongation shall be determined as the permanent
22、increase in length, expressed in percent of the original length,due to the wire breaking in tension. The elongation of the flatwire may be determined by measurements made between thejaws of the tensile testing machine. The zero length shall be thedistance between the jaws at the start of the tension
23、 test and beas near 10 in. (254 mm) as practicable. The final length shall bethe distance between the jaws at the time of rupture. Thefracture shall be between the jaws of the testing machine andnot closer than 1 in. (25.4 mm) to the jaw.6.2 Resistivity (Explanatory Note 4)The electrical resis-tivit
24、y of the material shall be determined in accordance withTest Method B193. The purchaser may accept certification thatthe wire was drawn from rod stock meeting the internationalstandard for annealed copper instead of resistivity tests on thefinished wire.6.3 Dimensional MeasurementsDimensional measur
25、e-ments for width and thickness shall be made with a micrometercaliper equipped with a vernier graduated in 0.0001 in. (0.0025mm). Measurements shall be made on at least three places oneach unit selected for this test. Any measurement takenTABLE 1 Tensile PropertiesAEquivalent RoundDiameter, in.Area
26、 at 20C Elongation in 10 in.,min, %cmils in.20.0641 4 110 0.00323 250.0571 3 260 0.00256 250.0508 2 580 0.00203 250.0453 2 050 0.00161 250.0403 1 620 0.00128 250.0359 1 290 0.00101 250.0320 1 020 0.000804 250.0285 812 0.000638 250.0253 640 0.000503 250.0226 511 0.000401 250.0201 404 0.00317 200.0179
27、 320 0.000252 200.0159 253 0.000199 200.0142 202 0.000158 200.0126 159 0.000125 200.0113 128 0.000100 200.0100 100 0.0000785 200.0089 79.2 0.0000622 150.0080 64.0 0.0000503 150.0071 50.4 0.0000396 150.0063 39.7 0.0000312 150.0056 31.4 0.0000246 150.0050 25.0 0.0000196 150.0045 20.2 0.0000159 150.004
28、0 16.0 0.0000126 15ASee Explanatory Note 3 for equivalent round calculation.TABLE 2 Electrical Resistivity RequirementsClass of Wire Vlb/mile2A 875.20H 902.27TABLE 3 Permissible Variations in ThicknessNominal ThicknessRange, Inch (mm)Tolerance,Inch (mm)0.0010 to 0.0014(0.025 to 0.036)+/- 0.0002(0.00
29、5)0.0015 to 0.0019(0.038 to 0.048)+/- 0.0003(0.008)0.0020 to 0.0049(0.051 to 0.124)+/- 0.0004(0.010)0.0050 to 0.0100(0.127 to 0.254)+/- 0.0005(0.013)TABLE 4 Permissible Variations in WidthNominal Width Range,Inch (mm)Tolerance,Inch (mm)0.0100 to 0.0499(0.254 to 1.27)+/- 0.0013(0.033)0.0500 to 0.0699
30、(1.27 to 1.78)+/- 0.0015(0.038)0.0700 to 0.0999(1.78 to 2.54)+/- 0.0020(0.051)0.1000 to 0.1249(2.54 to 3.17)+/- 0.0030(0.076)0.1250 to 0.1500(3.18 to 3.81)+/- 0.0040(0.102)B971 102exceeding the dimensions and permissible variation require-ments in 5.4 shall constitute failure to meet the dimensional
31、conformance criterion.6.4 Continuity of Coating:6.4.1 Specimens:6.4.1.1 Length of SpecimensTest specimens shall eachhave a length of about 6 in. (152 mm). They shall be tagged ormarked to correspond with the coil, spool, or reel from whichthey were cut.6.4.1.2 Treatment of SpecimensThoroughly clean
32、thespecimens by immersion in a suitable organic solvent for atleast 3 min; then remove and wipe dry with a clean, soft cloth(Caution: See Explanatory Note 7). Keep the specimens thuscleaned wrapped in a clean, dry cloth until tested. Do nothandle that part of the specimen to be immersed in the tests
33、olution. Take care to avoid abrasion by the cut ends.6.4.2 Special Solutions:6.4.2.1 Sodium Polysulfide Solution (sp gr 1.142)Make aconcentrated solution by dissolving sodium sulfide crystals(cp) in distilled water until the solution is saturated at about21C, and adding sufficient flowers of sulfur
34、(in excess of 250g/L of solution) to provide complete saturation, as shown bythe presence in the solution of an excess of sulfur after thesolution has been allowed to stand for at least 24 h. Make thetest solution by diluting a portion of the concentrated solutionwith distilled water to a specific g
35、ravity of 1.135 to 1.145 at15.6C. The sodium polysulfide test solution should havesufficient strength to blacken thoroughly a piece of cleanuncoated copper wire in 5 s. A portion of the test solution usedfor testing samples shall not be considered to be exhausteduntil it fails to blacken a piece of
36、clean copper as described(Explanatory Note 8):6.4.2.2 Hydrochloric Acid Solution (sp gr 1.088)Dilutecommercial HCl (sp gr 1.12) with distilled water to a specificgravity of 1.088 measured at 15.6C. A portion of the HClsolution having a volume of 180 mL shall be consideredexhausted if it fails to rem
37、ove within 15 s the discoloration ofthe silver due to the polysulfide immersion.6.4.3 Procedure:6.4.3.1 Immersion in Polysulfide SolutionImmerse alength of at least 4.5 in. (114 mm) from each of the cleanspecimens for 30 s in the sodium polysulfide solution, de-scribed in 6.4.2.1, maintained at a te
38、mperature between 15.6and 21C.6.4.3.2 WashingAfter the immersion, thoroughly washthe specimens in clean water and wipe dry with a clean, softcloth.6.4.3.3 Immersion in Hydrochloric AcidAfter washing,immediately immerse the specimen 15 s in the HCl solutiondescribed in 6.4.2.2, thoroughly wash in cle
39、an water, and wipedry with a clean, soft cloth.6.4.3.4 Examination of SpecimensAfter immersion andwashing examine the specimens to ascertain if copper exposedthrough openings in the silver coating has been blackened byaction of the sodium polysulfide. Examine the specimen withthe unaided eye (normal
40、 spectacles excepted) against a whitebackground. The specimens shall be considered to have failedif, by such blackening exposed copper is revealed. No attentionshall be paid to blackening within 0.5 in. (12.7 mm) of the cutend.6.5 FinishSurface-finish inspection shall be made withthe unaided eye (no
41、rmal spectacles excepted).7. Inspection7.1 General (Explanatory Note 9)Unless otherwisespecified in the contract or purchaser order, the manufacturershall be responsible for the performance of all inspection andtest requirements specified.7.1.1 All inspections and tests shall be made at the place of
42、manufacture unless otherwise especially agreed upon betweenthe manufacturer and the purchaser at the time of purchase.7.1.2 The manufacturer shall afford the inspector represent-ing the purchaser all reasonable manufacturers facilities tosatisfy him that the material is being furnished in accordance
43、with this specification.7.1.3 Unless otherwise agreed upon between the purchaserand the manufacturer, conformance of the wire to the variousrequirements listed in Section 5 shall be determined on samplestaken from each lot of wire presented for acceptance.7.1.4 The manufacturer shall, if requested p
44、rior to inspec-tion, certify that all wire in the lot was made under suchconditions that the product as a whole conforms to therequirements of this specification as determined by regularlymade and recorded tests.7.2 Definitions Applicable to Inspection:7.2.1 lotAny amount of wire of one type and siz
45、e pre-sented for acceptance at one time.7.2.2 SampleA quantity of production units (coils, reels,and so forth) selected at random from the lot for the purpose ofdetermining conformance of the lot to the requirements of thisspecification.7.2.3 SpecimenA length of wire removed for test pur-poses from
46、any individual production unit of the sample.7.3 Sample Size (Explanatory Note 9)The number ofproduction units in a sample shall be as follows:7.3.1 A full (100 % inspection) will be completed at everyset-up prior to running the order.7.3.2 For elongation, resistivity, dimensional measurements,conti
47、nuity of coating, and thickness of coating determinations,the sample shall consist of sequential production units from thelot.7.3.3 For surface-finish inspection and for packaging in-spection (when specified by the purchaser at the time of placingthe order) the sample shall consist of sequential pro
48、ductionunits from the lot.8. Conformance Criteria (Explanatory Note 9)8.1 Any lot of wire, the samples of which comply with theconformance criteria of section 5, shall be considered ascomplying to the requirements of this standard. Individualproduction units that fail to meet one or more of the requ
49、ire-ments shall be rejected. If a failure of an individual productionunit occurs, material which was made between the non-conforming unit and the last production unit which passed theconformance criteria must be inspected for the non-conformingcharacteristic.B971 1039. Density (Explanatory Note 10)9.1 For the purpose of calculating linear densities, crosssections, etc., the density of the copper shall be taken as 8.89g/cm3(0.32117 lb/in.3) at 20C.10. Packaging and Shipping10.1 Package sizes shall be agreed upon by the manufac-turer and the pu
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