Carbon black belongs to the carbon, and the structure of graphite powder is expressed in the form of a chain or a grape-like form between carbon black particles. The colloidal primary particles and aggregates of the approximate spheres exist, the high structure carbon black particles are fine, the mesh chain accumulates tightly, the specific surface area is large, and the unit mass particles are more favorable to form the chain conductive structure in the polymer. The size of the carbon black, a few large diameter particles need a large number of smaller diameter particles to compensate, the same average size distribution of carbon black than the distribution of narrow carbon black has more particles. The main constituent is the carbon element, is the fine powder which produces by the hydrocarbon compound (liquid or the gaseous) by incomplete combustion or pyrolysis. It also contains a small amount of hydrogen, oxygen, sulphur, ash, tar and water. The former commonly used oil absorption value indicates the structure, the larger the oil absorption value, the higher the structure of graphite powder carbon black, the easier to form the space Network channel, and is not easy to destroy. The carbon black particles with wide particle size distribution are more conductive to polymer than the narrow carbon black particles.
The elements of the graphite powder are fixed carbon, the structure is like the layered structure, but has the same structure as the graphite crystal, just by the carbon atom hexagonal annular plane formation of the layered structure is messy and irregular, crystal formation is defective, and small grains, containing a small amount of impurities. Most of the carbon are the molecular fragments of the graphite-layered structure, which are roughly parallel to each other, stacked irregularly, and can be referred to as the chaotic structure.