Graphite is a soft, slippery, greyish-black substance. It has a metallic luster and is opaque to light. Graphite is a good conductor of heat and electricity. Often graphite is simply named carbon. Under inert gas or vacuum graphite is extremely temperature-resistant which makes it an interesting material for high temperature applications. By heating graphite up to 3000°C its properties are optimized. As a result, heat treatment of graphite is a growing market and graphite has become an important material for a variety of applications all over the world. Graphite is often part of composite materials.