The structure of carbon black is expressed by the degree to which carbon black particles aggregate into a chain or grape shape. Carbon black composed of agglomerates composed of the size and shape of the agglomerates and the number of particles in each agglomerate is called high-structure carbon black. The oil absorption value is commonly used to indicate the structure. The larger the oil absorption value, the higher the structure of the carbon black. It is easy to form a spatial network channel and is not easy to damage.