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"A new natural graphite-epoxy composite material hase been developed. The material is lightweight, being only 1.9 g/cm3, and has an in-plane thermal conductivity of 370 W/mK, which is close to that of copper. This material is being used today as a fin material in combination with an aluminum or copper base to make hybrid heatsinks. As a fin material, the graphite-epoxy composite offers thermal performance significantly better than aluminum and approaching copper, but at only 70% and 21% of the weight of aluminum and copper, respectively. The result is a heatsink that performs like copper but at a fraction of the weight."
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