According to standard IEC 60287-2-1 Ed.2.0 with exception to metal, where the thermal conductivity of wrought iron/steel with a value of 59 W/K.m is taken instead.

Symbol
$\rho_{\mathrm{d}}$
Unit
K.m/W
Related
$M_{\mathrm{d}}$
Used in
$T_{\mathrm{4ii}}$
Choices
MaterialValue
Metal0.017
Fibre4.8
Cem2.0
PVC6.0
PE3.5
PP4.5
Earth1.2
WPE3.5