Characteristics

Annealed Copper

Annealed Copper

Cadmium Copper

Hard drawn Aluminum

Aluminum
Alloy

Galvanized
Steel

Conductivity Percent

100

97
(Average)

79.2(minimum)

61 =(minimum)

53.5 

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Volume Resistivity at 20^oC
Ohm-mm²/m
Micro ohm-inch³

0.017241*
(standard)
0.67879

0.0177 +
(Average)
0.69712

0.021769
(maximum)
0.85705

0.028264
(Maximum)
1.1128

0.0322
(standard)
1.2677

 ---

Mass Resistivity at 20 ^oC
Ohm-gramme/m
Ohm-pound/mile 

0.15328
875.20

0.15741
898.3

0.19472
1111.90

0.076398
436.23

0.08694
496.42

  ---

Resistance  at 20 ^oC
Ohm-mm²/Km
Ohm-inch₂/1000Y

17.241
0.024437

17.71
0.025096

21.769
0.030854

28.264
0.040059

32.20
0.045637

  ---

Density at 20 ^oC
gramme/cm³

8.89

8.89

8.945

2.703

2.703

7.78

Weight Kg.mm²/Km
Ib/inch²/1000Y

8.89
11562

8.89
11562

9.945
11634

2.703
3516

2.703
3516

7.78
10197

Temperature coefficient Of resistance at 20 ^oC /^oC

0.00393

0.00381

0.00381

0.00403

0.0036

 ---

Coefficient of linear
Expansion at 20 ^oC
Per ^oC
Per ^oF

17 x 10 ^-6
9.44 x10^-6

17 x 10 ^-6
9.44 x10^-6

17 x 10 ^-6
9.44 x10^-6

23x10-⁶
9.44x10^-6

12.78x10-⁶
23x10^-6

11.5x10^-6
6.4x10^-6

Ultimate tensile stress
(approximate)
Kg/mm²
Ib/inch²

25.3
36000

42.2
60000

63.3
90000

16.5
23500

29
44000

136
194000

Modulus of elasticity
(approximate)
Kg/mm²
Ib/inch²

9 to
10.5 x 10⁶
13 to
15x 10⁶

12.66x10³
18x10⁶

12.66x10³
18x10⁶

6.96x10³
18x10⁶

7x10³
9.9x10⁶

20x10³
28x10⁶