Talc powder
Talcum powder is a well-known plastic filler, and its biggest advantage is its layered structure and low hardness. The former can improve the rigidity and heat resistance of the filled plastic, while the latter can greatly reduce the wear of the material on the mechanical equipment and molds in contact during the processing of the filled plastic. Talc powder, like non-metallic mineral powder materials containing silicon such as mica and kaolin, has the ability to block infrared radiation. This characteristic has been used in the manufacturing of polyethylene agricultural films, and agricultural greenhouse films containing about 5% talc powder can effectively block infrared thermal radiation, thereby improving the insulation properties of the films.
Precipitation of barium sulfate and barite powder
Precipitated barium sulfate is a powder material made by chemical methods, and its particle size range and whiteness can be controlled to a certain extent. The biggest characteristic of precipitated barium sulfate is its high relative density, which can reach around 4.5. However, due to its ability to absorb X-rays and Y-rays, it can be used as a plastic material for protecting against high-energy radiation. In addition, the polypropylene plastic filled with it has a good surface gloss after injection molding, so it is now commonly used in the manufacturing of high gloss polypropylene products. Natural barium sulfate ore is called barite and belongs to the rhombic crystal system. It can also achieve appropriate particle size through crushing and grinding.
Wood flour
China has a long history of using wood chips, sawdust, and wood powder as filling materials for plastics. In addition to traditional products such as "electric wood", there are cases where wood chips, sawdust, and wood powder are added to plastics to make boards or injection molded palace lamp frames, with the goal of replacing wood as the substrate. According to statistics, there are more than 100 enterprises and institutions directly or indirectly engaged in the research and development, production, and matching of wood plastic composite materials in China, There are tens of thousands of employees, and the annual production and sales of wood plastic products exceed 100000 tons. In fact, the production capacity of existing wood plastic products far exceeds this scale. Wood powder materials are natural polymer materials that appear in plants. From a material perspective, any plant contains cellulose, hemicellulose (pentose), and lignin, as well as a small amount of inorganic substances (SiO2 is mainly present in the remaining ash after combustion). Cellulose and hemicellulose molecules are covered with hydroxyl groups, which are not compatible with the macromolecules of synthetic resins and are different from non-metallic minerals such as calcium carbonate. Therefore, the essential characteristics of wood powder materials and their processed forms have an impact on the properties of wood plastic composites.

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