As mentioned in the last issue, talc, diatomaceous earth, kaolin, fumed silica, etc. are functional fines specially used as matting agent, which belongs to inorganic filled matting agent. When the film is drying, their tiny particles will form a micro-rough surface on the surface of the film, reducing the reflection of light to obtain the appearance of matting. However, the matting effect of such matting agents is subject to the constraints of many factors.