"Suitable thermally-conductive particulate fillers generally include metal and non- metal oxides, nitrides, carbides, diboride, graphite, and metal particles, and mixtures thereof, and more particularly boron nitride, titanium diboride, aluminum nitride, silicon carbide, graphite, metals such as silver, aluminum, and copper, metal oxides such as aluminum oxide, magnesium oxide, zinc oxide, berylliu" . . . . . . . . . . . . . . . . . .