Filling agent, also known as additive; addition agent; stuffing bulking agent, it can be added to the material to improve the performance of the material, or can increase the capacity, weight, reduce the cost of solid materials. Usually water-free, neutral, organic, inorganic, metal or non-metal powders that do not play a negative role with the material components can be used as fillers. Commonly used industrial fillers are diatomaceous earth, talc, graphite, carbon black, alumina powder, glass powder, asbestos powder, mica powder, quartz powder, carbon fiber, powdered cork, emery, etc. In the chemical production of plastic processing, rubber processing, paper, coatings, pesticides, pharmaceuticals and other products in large quantities using a variety of fillers, not only to improve the performance of these products, but also greatly reduce production costs.