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
$\epsilon_i$
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
OilP3.6 (self-contained U_n <= 150kV)
3.5 (self-contained U_n > 150kV)
3.7 (pipe-type oil-filled)
3.6 (pipe-type external gas pressure)
3.4 (pipe-type internal gas pressure)
PP2.21
SiR3.2
EVA2.95