Graphite is a kind of crystalline form of carbon, with hexagonal lattice, atoms are arranged in layers. The distance between carbon atoms on the same layer crystal plane is 0.142 nm, and they are covalent bond with each other. The distance between layers is 0.34 nm, and the atoms are molecular bond.The interaction between layers is very small, so it is easy to slide relative between layers.Because of these structural characteristics, lead to its strength hardness is very low, plasticity is also very poor, but can play a very good anti-wear effect, is a good solid lubricant.Lubricating oil often can not be used under the conditions of high speed, high temperature and high pressure, while graphite wear-resistant materials can be used under the conditions of high speed, high temperature and high pressure.So graphite can be used as a lubricant in the machinery industry.