comprising consisting of or consisting essentially of the composition will exhibit thermal conductivity is in two directions each generally perpendicular to each other one will be the in plane conductivity and the other the through plane conductivity therefore the thermal conductivities in the through plane and the in plane directions will each preferably be greater than 1 0 w m u00b0 k with the thermal conductivities of each being greater than 2 0 w m u00b0 k even more preferred and thermal conductivities of each being greater than 3 0 w m u00b0 k most preferred the composition can also be void of alumina or essentially free of alumina it is also known that the carbon filler may not have a layer of thermally conductive and electrical insulative material coated on it in other words the carbon filler is not coated with the nitride boron nitrides useful in this composition are generally found in particle form or agglomerate form when in particle form the boron nitride appears as platelets having a mean particle size of 35 microns 12 13 microns and a surface area of 0 1 to 1 0 square meters gram these boron nitrides are available from momentive performance materials strongsville ohio usa previously known as advanced ceramics cleveland oh usa as polartherm u00ae 110 and 220 respectively boron nitride is also available in agglomerates approximating a sphere or spherical these agglomerates have a mean particle size of 55 65 microns and a nominal surface area of 5 5 square meters gm these boron nitride agglomerates are available.