come in a variety of thickness and consist of pure carbon. Carbon comes in different forms and while diamonds are the most valuable form, graphite is a more widespread form. Graphite has a sheet structure in which electrons can move freely between the layers making graphite an electrical conductor and excellent heat conductor.
Since the electrons can move more easily in between the layers, the thermal conductivity is much better in the XY plane than it is in the Z direction. This makes graphite an optimal material to act as a heat spreader.
✓ CPU, GPU
✓ Micro BGA
✓ High temperature applications