Brochure: Carbon Additives for Polymer Compounds - Timcal Graphite

THERMALLY ConduCTIvE poLYMERS
Thermally conductive polymers are able to
evenly distribute heat generated internally
from a device and eliminate “hot spots.” Possible
applications for thermally conductive
plastics include heat sinks, geothermal pipes,
LED light sockets, heat exchangers, appliance
temperature sensors and many other industrial
applications. Also thermally conductive elastomers
can be found in a wide variety of industrial
applications such as gaskets, vibration
dampening, interface materials, and heat sinks.
As highlighted in the fi gure, the low thermal
conductivity of virgin PPH (~0.38 W/m.K)
could be increased by one order of magnitude
already at relatively low addition level
(~3.5 W/m.K at 20% C-THERM). The “throughplane”
thermal conductivity is about the half of
the longitudinal “in-plane” thermal conductivity.
These results indicate that the anisotropy
of the graphite particles is conferred to the
fi nal compound, due to their alignment during
the injection molding process. This is an
important property that has to be taken into
account by design engineers. Of course the
thermal conductivity strongly depends not
only on the sample orientation (direction) dur-
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ing the measurement, but also on the type of
polymer, the sample history (type and conditions
of compounding and processing) and the
measurement method.
A full set of measurements to determine mechanical
properties in PP were performed and
are available to customers. When tested at the
same loadings, C-THERM 001/011 imparts
similar mechanical properties as conventional
carbon materials.
Thermal Conductivity [W/m.K]
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
inj >
In-plane
Virgin PPH 20%
20%
ENSACO®
250G
Through-plane
TIMREX®
KS25
20%
TIMREX®
C-THERM
In-plane
Through-plane
23
TYpICAL AppLICATIonS FoR TIMREX® GRApHITE And CokE