C-Therm Blog

The Thermal Conductivity of Unfilled Plastics

The C-Therm TCiTM Thermal Conductivity Analzyer provides a fast and easy way to meansure thermal conductivity of polymers.
 
C-Therm TCi Thermal Conductivity Analyzer, with MTPS (ASTM D7984) and TLS (ASTM D5930) Sensors
Above:  C-Therm TCi Thermal Conductivity Analzyer, with MTPS (ASTM D7984)
and TLS (ASTM D5930) Sensors
 

Thermal Conductivity of Unfilled Plastics (W/mK)1

Acrylonitrile-butadiene-styrene
ABS
0.14 - 0.21
Acetal
Delrin
0.23 - 0.36
Cellulose acetate
CA
0.16 - 0.36
Diallyl phthalate
Dapon
0.31
Epoxy
 
0.19
Ethylcellulose
 
0.23
Ethylvinylacetate
 
0.08
Phenolic
 
0.17
Polyamide
Nylon 6-11-12-66
0.24 - 0.3
Polyaramide
Kevlar, Nomex fibers
0.04 - 0.13
Polycarbonate
PC
0.19 - 0.22
Polytetrafluorethylene
PTFE, Teflon
0.25
Polyethylene terephthalate
PET, Polyester
0.15 - 0.4
Polyethylene L
Low density
0.33
Polyethylene HD
High density
0.45 - 0.52
Polyimide
Kapton
0.10 - 0.35
Polymethylmethacrylate
PMMA,Acrylic, Perspex, Plexiglass
0.17 - 0.19
Polyphenylene oxide
PPO, Noryl
0.22
Polypropylene
PP
0.1 - 0.22
Polystyrene
PS
0.1 - 0.13
Polysulfone
 
0.26
Polyurethane
PUR
0.29
Polyvinylchloride
PVC
0.12 - 0.25
Polyvinylidene fluoride
Kynan
0.1 - 0.25
 
All values in the table are defined at room temperature. As a rule-of-thumb, the thermal conductivity increases with a few percent in the range 0-100°C. Only below very low temperatures (typically 40K), plastics show a clear decrease.  Fillers such as silver, copper, CNTs etc. typically cause a sharp increase in the thermal conductivity of a polymer composite
 
 
1Source: Electronics Cooling - Design, Materials, Compounds, Adhesives, Substrates, Number 2, Technial Data, Volume 7

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