The values for the specific isobaric volumetric heat capacity of insulation material per K at 20°C are taken from standard IEC 853-2 Ed.1.0 where available with the following additions:

Symbol
$\sigma_{\mathrm{i}}$
Unit
J/K.m³
Related
$M_{\mathrm{i}}$
Used in
$Q_{\mathrm{i}}$
Choices
MaterialValue
PE2400000.0
HDPE2400000.0
XLPE2400000.0
XLPEf2400000.0
PVC1700000.0
EPR2000000.0
IIR2000000.0
PPLP2000000.0
Mass2000000.0
Oil2000000.0
PP1800000.0
SiR1400000.0
EVA2100000.0