Thermal conductivity | materials feature
Nanofl ash test method) of the polyamide with 65% mineral reinforcement is 1.0 W/mK. The material with a 75% mineral content tested at 1.5 W/mK. Lanxess claims that the two materials conduct heat as effi ciently as polyamides containing boron nitride or aluminium oxide. “However, aluminium oxide systems have the disadvantage of being very abrasive, which quickly causes damage to the injection mould. Compared to boron nitride systems, our materials are signifi cantly less expensive and have better mechanical proper-
ties. Furthermore, their thermal conductivity is virtually the same in all directions,” Joachimi says. The products also have good
mechanical properties – on par in
some cases with those of Durethan BKV 30 H2.0 – despite a high fi ller content. For
example, Durethan BTC65 H3.0 EF is equally as stiff and displays a similar elongation at break of 3%. Izod
impact strength of 35 kJ/m2 is more than twice as high
as in comparable polyamide compounds with aluminium oxide fi ller, according to Joachimi.
DSM is another
engineering plastics producer that has been actively developing and
marketing thermally conductive compounds. One of its most recent
applications is in large LED down-lights from market leader Osram which feature heat sinks made using its Stanyl TC thermally conductive polyamide 46. Chosen ahead of aluminium, Stanyl TC scores with its
ability to be easily and quickly injection mould- ed into complicated geometries that effectively remove heat from around the LED light source, thus ensuring a long lifetime.
The L and XL versions of Osram’s LedvanceCE series
RTP is making compounds with both EMI shielding and thermally conductive properties
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