Thermal resistivity sheath jacket material

Typical values for different materials are listed below.

Values are taken from IEC 60287-2-1 with following additions or deviations:

Value for polypropylene (PP) is taken from professionalplastics.com
Values for silicone rubber (SiR) are taken from shinetsusilicone-global.com
The value for chlorosulphonated polyethylene (CSM) is taken from the data sheet of Hypalon from the chemical conpany metz.net.au

Symbol

$\rho_{shj}$

Unit

K.m/W

Related

$M_{shj}$

Sheath jacket material

$U_{n}$

Rated line-to-line voltage [kV]

Used in

$G_{corr}$

Geometric factor $G_{corr}$ for jacket around each core

$T_{2}$

Thermal resistance armour bedding [K.m/W]

$T_{shj}$

Thermal resistance sheath jacket [K.m/W]

Choices

Code	Value	Material	Reference
PE	3.5	Polyethylene (LD/MDPE, ST3)	IEC 60287-2-1
HDPE	3.5	High density polyethylene (HDPE, ST7)	IEC 60287-2-1
PVC	5.0 (U_n <= 30kV) 6.0 (U_n > 30kV)	Polyvinyl chloride (PVC, ST1/2)	IEC 60287-2-1
POC	3.5	Polyolefin copolymer (POC)	= PE
PP	4.5	Polypropylene (PP)	professionalplastics.com
SiR	5.0	Silicone rubber (SiR)	shinetsusilicone-global.com
FRNC	3.5	Flame-Retardant Non-Corrosive polyethylene (FRNC)	= PE
CR	5.5	Polychloroprene (CR, Neoprene)	IEC 60287-2-1
CSM	9.1	Chlorosulphonated polyethylene (Hypalon)	metz.net.au