Thermal resistivity insulation material

The values of the thermal resistivity of insulation are taken from standard IEC 60287-2-1 where available with the following additions:

The semi-conducting screening materials are assumed to have the same thermal properties as the adjacent dielectric materials.
For Butyl rubber the range is 4.3 to 7.7 according to matmake.com
Value for Polypropylene (PP) is based on the minimal value of thermal conductivity (0.17 to 0.22) given in the book 'Polypropylene - The Definitive Users Guide and Databook', Plastics Design Library, 1998. whereas a range of 0.10 to 0.23 is given by professionalplastics.com
Value for Silicone rubber (SiR) is taken from shinetsusilicone-global.com
Value for Ethylene vinyl acetate (EVA) is taken from expresspolymlett.com and J. Allan and Z. Dehouche: 'Enhancing the thermal conductivity of ethylene-vinyl acetate (EVA) in a photovoltaic thermal collector', 2016 ().

Symbol

$\rho_{i}$

Unit

K.m/W

Related

$M_{i}$

$U_{n}$

Used in

$d_{c,t}$

$T_{1}$

$T_{i}$

$T_{ins}$

$X_{K}$

Choices

Code	Value	Material
PE	3.5	Polyethylene (LD/MDPE)
HDPE	3.5	High density polyethylene (HDPE)
XLPE	3.5	Crosslinked polyethylene (XLPE)
XLPEf	3.5	Crosslinked polyethylene (XLPE) filled
PVC	5.0 (U_n <= 3kV) 6.0 (U_n > 3kV)	Polyvinyl chloride (PVC)
EPR	3.5 (U_n <= 3kV) 5.0 (U_n > 3kV)	Ethylene-propylene rubber (EPR)
IIR	5.0	Butyl rubber (IIR isobutylene isoprene rubber)
PPLP	5.5	Polypropylene laminated paper (PPLP)
Mass	6.0	mass-impregnated paper
OilP	5.0 (self-contained) 5.0 (pipe-type oil-filled) 5.5 (pipe-type gas pressure)	oil-filled paper
PP	5.9	Polypropylene (PP)
SiR	5.0	Silicone rubber (SiR)
EVA	4.35	Ethylene vinyl acetate (EVA)
XHF	4.0	X-HF-110 (AS/NZS 3808:2000 R2016)