1、Designation: B972 10Standard Specification forNickel-Coated Braid and Ribbon Flat Copper Wire Intendedfor use in Electronic Application1This standard is issued under the fixed designation B972; 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 nickel-coated copper braid andribbon flat wire intended for electroni
3、c application (Explana-tory Note 1).1.2 Two classes of nickel-coated braid and ribbon flatcopper wire are covered as follows:1.2.1 Class A Annealed temper.1.2.2 Class H Hard-drawn.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematica
4、lconversions 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
5、 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.2. Referenced Documents2.1 ASTM Standards:2B1 Specification for Hard-Drawn Copper WireB3 Specification for Soft or Annealed
6、 Copper 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:3NB
7、S 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)
8、,3.1.5 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 nickel-coated flat wire (Explana-tory Note 1) of such quality and purity that the finished productshall meet the properties and characteristics pre
9、scribed 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 defines copper suitable for use.5. General Requirements (Se
10、e Section 8)5.1 TemperThe nickel-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 A The nickel-coated copper flat wire i
11、n theannealed 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.(
12、0.025 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 dire
13、ct responsibility 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 volu
14、me information, 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-
15、2959, United States.5.2.2 Class HThe nickel-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
16、wire 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 nickel-coated flat wire shall n
17、ot vary from thespecified thickness and width by more than the amountsspecified in Table 3 and Table 4, respectively.5.5 Continuity of CoatingThe nickel coating shall becontinuous. The continuity of coating on the flat wire shall bedetermined on representative samples taken before braidingapplicatio
18、ns or 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 50 in. (0.00005 in.) (0.0013 mm) shallnot be subject to this test (Explanatory Note 5). The thicknessof
19、 coating shall be determined in accordance with Test MethodA as 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 FinishTh
20、e coating shall 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, expresse
21、d in pounds per 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 of the flat wire may
22、 be determined bymeasurements made between the jaws of the tensile testingmachine. The zero length shall be the distance between thejaws at the start of the tension test and be as near 10 in. (254mm) as practicable. The final length shall be the distancebetween the jaws at the time of rupture. The f
23、racture shall bebetween the jaws of the testing machine and not closer than 1in. (25.4 mm) to the jaw.6.2 Resistivity (Explanatory Note 4)The electrical resis-tivity of the material shall be determined in accordance withTest Method B193. The purchaser may accept certification thatthe wire was drawn
24、from rod stock meeting the internationalstandard for annealed copper instead of resistivity tests on thefinished wire.6.3 Dimensional MeasurementsDimensional measure-ments for width and thickness shall be made with a micrometercaliper equipped with a vernier graduated in 0.0001 in. (0.0025mm). Measu
25、rements shall be made on at least three places oneach unit selected for this test. Any measurement takenTABLE 1 Tensile PropertiesAEquivalentRound Diameter,in.Area at 20C Elongationin 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
26、.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 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
27、 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 150.0040 16.0 0.0000126 15ASee Explanatory Note 3 for equivalent round calculation.TABLE 2 Electrical Resistivity RequirementsClass A Thickness R
28、ange,Inch (mm)Resistivity at 20CVlb/mile20.0008 to 0.0010 (0.020 to 0.025), incl 1029.70.0011 to 0.0013 (0.028 to 0.033), incl 994.550.0014 to 0.0018 (0.037 to 0.046), incl 972.450.0019 to 0.0028 (0.048 to 0.071), incl 951.310.0029 to 0.0039 (0.074 to 0.099), incl 931.070.0040 to 0.0065 (0.102 to 0.
29、165), incl 921.270.0065 to 0.0100 (0.165 to 0.254), incl 911.67Class H Thickness Range,Inch (mm)Resistivity at 20CVlb/mile20.0008 to 0.0010 (0.020 to 0.025), incl 1067.30.0011 to 0.0013 (0.028 to 0.033), incl 1029.70.0014 to 0.0018 (0.037 to 0.046), incl 1006.00.0019 to 0.0028 (0.048 to 0.071), incl
30、 983.380.0029 to 0.0039 (0.074 to 0.099), incl 961.760.0040 to 0.0065 (0.102 to 0.165), incl 951.310.0065 to 0.0100 (0.165 to 0.254), incl 941.08TABLE 3 Permissible Variations in ThicknessNominal Thickness Range,Inch (mm)Tolerance,Inch (mm)0.0010 to 0.0014 (0.025 to 0.036) +/- 0.0002 (0.005)0.0015 t
31、o 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 0.06
32、99 (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)B972 102exceeding the dimensions and permissible variation require-ments in 5.4 shall constitute failure to meet t
33、he dimensionalconformance criterion.6.4 Continuity of Coating:6.4.1 Length of SpecimensTest specimens shall each havea length of about 6 in. (152 mm). They shall be tagged ormarked to correspond with the coil, spool, or reel from whichthey were cut.6.4.2 Treatment of SpecimensThe specimens shall bet
34、horoughly cleaned by immersion in a suitable organic solventfor at least 3 min, then removed and wiped dry with a clean,soft cloth or tissue (Caution: Explanatory Note 7). Thespecimens thus cleaned shall be kept wrapped in a clean, drycloth or tissue until tested. That part of the specimen to beimme
35、rsed in the test solution shall not be handled. Care shallbe taken to avoid abrasion by the cut ends.6.4.3 Special Solution (sp gr 1.142)A concentrated solu-tion shall be made by dissolving sodium sulfide crystals (cp) indistilled water until the solution is saturated at about 21C, andadding suffici
36、ent flowers of sulfur (in excess of 250 g/L ofsolution) to provide complete saturation, as shown by thepresence in the solution of an excess of sulfur after the solutionhas been allowed to stand for at least 24 h. The test solutionshall be made by diluting a portion of the concentrated solutionwith
37、distilled water to a specific gravity of 1.135 to 1.145 atambient temperature of 15.6 C. The sodium polysulfide testsolution should have sufficient strength to thoroughly blackena piece of clean uncoated copper wire in 5 s. A portion of thetest solution used for testing samples shall not be consider
38、ed tobe exhausted until it fails to blacken a piece of clean copper asdescribed above (Explanatory Note 8).6.4.4 ProcedureImmerse a length of at least 4.5 in. (114mm) from each of the clean specimens for 30 s in the sodiumpolysulfide solution (see 6.4.3) maintained at a temperaturebetween 15.6 and 2
39、1C. After the immersion, immediatelywash the specimens in clean water and wipe dry with a clean,soft cloth or tissue. After immersion and washing, examine thespecimens to ascertain if copper exposed through openings inthe nickel coating has been blackened by action of the sodiumpolysulfide. Examine
40、the specimen with the normal eye againsta white background. Consider the specimens to have failed if,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 (n
41、ormal spectacles excepted).7. Inspection7.1 General (Explanatory Note 9)Unless otherwise speci-fied in the contract or purchaser order, the manufacturer shallbe responsible for the performance of all inspection and testrequirements specified.7.1.1 All inspections and tests shall be made at the place
42、 ofmanufacture 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 accorda
43、ncewith 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 requeste
44、d prior 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
45、 size 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 purposesfro
46、m 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,cont
47、inuity 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 pr
48、oductionunits 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 with the requirements of this standard. Individualproduction units that fail to meet one or more of the r
49、equire-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.9. 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 purchaser i
