ASTM B298 - 12

    Standard Specification for Silver-Coated Soft or Annealed Copper Wire

    Active Standard ASTM B298 | Developed by Subcommittee: B01.04

    Book of Standards Volume: 02.03


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    Abstract

    This specification covers silver-coated, soft or annealed, round copper wire, intended for use in electrical equipment. The silver-coated wires are classified according to the total weight of the coated wires, namely; Class A, B, C, D, and E. Tensile strength test, resistivity test, weight of coating, and dimensional measurements shall be performed to conform to the requirements specified.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification covers silver-coated, soft or annealed, round copper wire, intended for use in electrical equipment, as follows:

    1.1.1 Class A—Wire whose silver coating is at least 1.25 % of the total weight of the coated wire.

    1.1.2 Class B—Wire whose silver coating is at least 2.50 % of the total weight of the coated wire.

    1.1.3 Class C—Wire whose silver coating is at least 4.00 % of the total weight of the coated wire.

    1.1.4 Class D—Wire whose silver coating is at least 6.10 % of the total weight of the coated wire.

    1.1.5 Class E—Wire whose silver coating is at least 10.00 % of the total weight of the coated wire.

    1.2 Silver-coated wire having different minimum percentages of silver by weight may be obtained by mutual agreement between the manufacturer and the purchaser. For information purposes the thickness of coating in microinches provided by the percentages listed above is shown in Table 1 (Explanatory Note 1).

    TABLE 1 Tensile Requirements

    Diameter,
    in.

    Area at 20°C

    Elongation
    in 10 in.,
    min, %

    Thickness of Coating, μin. (For Information Only)

    cmils

    in.2

    Class A, 1.25
    % Silver

    Class B, 2.50
    % Silver

    Class C, 4.00
    % Silver

    Class D, 6.10
    % Silver

    Class E, 10.00
    % Silver

    0.1285

    16 510

    0.01297

    30

    340

    680

     1 090

    1 659

    2 720

    0.1144

    13 090

    0.01028

    30

    303

    605

    970 

    1 477

    2 422

    0.1019

    10 380

    0.008155

    25

    270

    539

    864 

    1 316

    2 157

    0.0907

     8 230

    0.00646

    25

    240

    480

    768 

    1 171

    1 941

    0.0808

     6 530

    0.00513

    25

    214

    428

    684 

    1 043

    1 710

    0.0720

     5 180

    0.00407

    25

    190

    381

    610 

    930  

    1 524

    0.0641

     4 110

    0.00323

    25

    170

    339

    542 

    828  

    1 357

    0.0571

     3 260

    0.00256

    25

    151

    302

    483 

    737  

    1 209

    0.0508

     2 580

    0.00203

    25

    134

    269

    430 

    656  

    1 075

    0.0453

     2 050

    0.00161

    25

    120

    240

    383 

    585  

    959  

    0.0403

     1 620

    0.00128

    25

    107

    213

    341 

    520  

    853  

    0.0359

     1 290

    0.00101

    25

    95 

    190

    304 

    464  

    760  

    0.0320

     1 020

    0.000804

    25

    85 

    169

    270 

    413  

    677  

    0.0285

       812

    0.000638

    25

    75 

    151

    241 

    368  

    603  

    0.0253

       640

    0.000503

    25

    67 

    134

    214 

    327  

    536  

    0.0226

       511

    0.000401

    25

    60 

    120

    191 

    292  

    478  

    0.0201

       404

    0.00317

    20

    53 

    106

    170 

    260  

    425  

    0.0179

       320

    0.000252

    20

    47 

    95 

    151 

    231  

    379  

    0.0159

       253

    0.000199

    20

    42 

    84 

    135 

    205  

    337  

    0.0142

       202

    0.000158

    20

    ...

    75 

    120 

    183  

    301  

    0.0126

       159

    0.000125

    20

    ...

    67 

    107 

    163  

    267  

    0.0113

       128

    0.000100

    20

    ...

    60 

    96  

    146  

    239  

    0.0100

       100

    0.0000785

    20

    ...

    53 

    85  

    129  

    212  

    0.0089

        79.2

    0.0000622

    15

    ...

    47 

    75  

    115  

    188  

    0.0080

        64.0

    0.0000503

    15

    ...

    42 

    68  

    103  

    169  

    0.0071

        50.4

    0.0000396

    15

    ...

    ...

    60  

    92   

    150  

    0.0063

        39.7

    0.0000312

    15

    ...

    ...

    53  

    81   

    133  

    0.0056

        31.4

    0.0000246

    15

    ...

    ...

    47  

    72   

    119  

    0.0050

        25.0

    0.0000196

    15

    ...

    ...

    42  

    65   

    106  

    0.0045

        20.2

    0.0000159

    15

    ...

    ...

    ...

    58   

    95   

    0.0040

        16.0

    0.0000126

    15

    ...

    ...

    ...

    52   

    85   

    0.0035

        12.2

    0.00000962

    15

    ...

    ...

    ...

    45   

    74   

    0.0031

         9.61

    0.00000755

    15

    ...

    ...

    ...

    40   

    66   

    0.0028

         7.84

    0.00000616

    10

    ...

    ...

    ...

    ...

    59   

    0.0025

         6.25

    0.00000491

    10

    ...

    ...

    ...

    ...

    53   

    B49 Specification for Copper Rod Drawing Stock for Electrical Purposes

    B193 Test Method for Resistivity of Electrical Conductor Materials

    B258 Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors

    E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials


    ICS Code

    ICS Number Code 77.150.30 (Copper products)

    UNSPSC Code

    UNSPSC Code 26121517(Copper wire)


    Referencing This Standard

    DOI: 10.1520/B0298-12

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM B298-12, Standard Specification for Silver-Coated Soft or Annealed Copper Wire, ASTM International, West Conshohocken, PA, 2012, www.astm.org

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