Mineral filler is made from coal as the main raw material after purification and modification. It is used as filler, bulking agent and reinforcing agent for all kinds of natural rubber and synthetic rubber, mostly used in the production of industrial rubber products such as airtight ply, top and sidewalls of tires, and it is a new type of filler for conveyor belts, low-speed agricultural tires and mining tires. The company cooperates with Taiyuan University of Technology Polymer Materials College to carry out in-depth technical research and development of the product, and the product technology and production process are very mature. It is widely used as a partial substitute for traditional carbon black, and the price is only half of traditional carbon black, and the market share continues to expand.