Low porosity, functionalized, carbon micro-powders

A polymer composite comprising a carbon micro-powder characterized in having three or more of the following properties:

• a) a carbon content of from 65 to 95% and an oxygen content of 35 to 5% on a weight basis;
• b) a specific surface area of less than 500 m2/g;
• c) percent crystallinity of 5% to 75%;
• d) the particles have a platelet morphology with aspect ratios greater than 5:1;
• e) the particles have significant curvature such that they are not planar;
• and
• f) the particles have a smooth, non-porous appearance at 1,000× magnification by SEM
• and a thermosetting or thermoplastic polymer, wherein the bulk thermal conductivity of the composite is greater than 0.27 W/m-K, and the electrical resistivity of the composite is greater than 1.0E10 Ohm-cm.