The values for copper and aluminium are form the standard IEC 60287-2-1 Ed.2.0, Figure 4, whereas the other values are average values from various sources.

Symbol
$\rho_{\mathrm{m}}$
Unit
K.m/W
Related
$M_{\mathrm{sc}}$
$M_{\mathrm{sh}}$
Used in
$X_{\mathrm{K}}$
Choices
MaterialValue
Cu0.0027
Brz0.02
S0.0277
SS0.0613
Al0.0048
Zn0.0086
Pb0.0299