ASTM B 298:2012

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 20C Elongation in 10 in., min,% Thickness of Coating, in. (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 16510 0.01297 30 340 680 1090 1659 2720 0.1144 13090 0.01028 30 303 605 970 1477 2422 0.1019 10380 0.008155 25 270 539 864 1316 2157 0.0907 8230 0.00646 25 240 480 768 1171 1941 0.0808 6530 0.00513 25 214 428 684 1043 1710 0.0720 5180 0.00407 25 190 381 610 930 1524 0.0641 4110 0.00323 25 170 339 542 828 1357 0.0571 3260 0.00256 25 151 302 483 737 1209 0.0508 2580 0.00203 25 134 269 430 656 1075 0.0453 2050 0.00161 25 120 240 383 585 959 0.0403 1620 0.00128 25 107 213 341 520 853 0.0359 1290 0.00101 25 95 190 304 464 760 0.0320 1020 0.000804 25 85 ...