The size of the specific surface area is determined by the particle size of the silica. The particle size of the filler refers to the diameter of the primary aggregate and is one of the most important properties of the powder material. Since the primary structure of silica is irregular and amorphous, the silica is generally amorphous silica. The specific surface area is the total surface area per gram of white carbon black. The finer the white carbon black particle size, the larger the specific surface area, the higher the reinforcing property to the rubber, and the higher the hardness of the compound compound, the more difficult it is to mix. The larger the specific surface area of silica, the more atoms or groups of atoms on the surface, the greater the surface energy. The stronger the adsorption of the accelerator during mixing. In general, the particle size is small, the specific surface area is large, the tear strength, the tensile stress, and the hardness of the rubber are all increased, while the elasticity and elongation are decreased, and the compression permanent deformation is increased. The increase of the specific surface area increases the boundary area between the rubber and the filler, and the bonding glue generated by the interaction between the two increases, and the natural strength factor increases.