4 The Specific Resistance and Conductivity Various
Materials
Table 4.3
.21:
176 ____________________________________________________________
Material Specific resistance Conductivity in
Ohm mm2 m
in Ohm mm2
Aluminium 0.
4.016 61
Zinc 0.5
Tin 0.
Due the thinness the layer, the poor electrical conductivity nickel is
insignificant.7. The parts are immersed aqueous passivation emulsion.12 8. The brass contacts are first
plated with 3-pm nickel layer (diffusion barrier) then with 2-pm gold
layer the contact area. brownish
sulphide layer easily develops its surface.069 14.
4. This can be
very important, especially for small currents and low voltages.061 16.017 58
Brass (CuZn40) 0.4.1 Silver
The conductivity silver excellent, better than gold fact.
4.5
Copper 0.7.3 Nickel
A 5-pm layer nickel applied protect large-surface parts, such earth
panels.7.028 36
Gold 0. This
surface protection sufficient for almost all industrial connectors
applications. Silver produces moderate diffusion
barrier.2 Gold
The finest surfaces are created with gold plating.7. The contacts are silver-plated,
with layer thickness pm.
This surface protection used for aggressive environments.5
Silver 0.067 15
Nickel 0. The electrical
conductivity gold significantly less than that silver, but due its
constant contact resistance, used special applications.023 43
