Relative permittivity of insulation

The values for relative permittivity, known as dielectric constant, of insulation are taken from standard IEC 60287-1-1 Ed.2.1 where available with the following additions:

Symbol
$\epsilon_{i}$
Used in
$C_{b}$
Choices
MaterialValue
PE2.3
HDPE2.3
XLPE2.5
XLPEf4.0 (U_n <= 30kV)
3.0 (U_n > 30kV)
PVC8.0
EPR3.0
IIR4.0
PPLP2.8
Mass4.0
Oil3.6 (U_n <= 150kV)
3.5 (U_n > 150kV)
PP2.27
SiR3.2
SiR2.95