The main materials used for exterior parts such as Bumper Mold are PP + EPDM and modified products of talc. PP is a kind of crystallinity and has a certain degree of shrinkage. Its shrinkage is affected by the temperature of the mold and provides a certain strength of the bumper product. EPDM is a kind of rubber that can absorb impact energy to a certain extent. It is blended with PP to improve the tensile and bending properties of the material. Adding talcum powder increases the strength of the material to meet certain performance requirements. At the same time, other additives are added to the material to improve the reaction mechanism of the material and adjust the shrinkage rate. In the injection molding process, some additives can also play a certain cross-linking role, improve the mutual combination between EPDM and PP, and further improve the mechanical properties of the product.

The structure of Automotive Mold depends to a large extent on the product structure and product quality:
Mold ejection system requirements: According to the requirements for the position of the product parting line, consideration must be given to the design of the mold ejection system. If there is no special requirement for the position of the parting line, it can be ejected after the mold is opened in place. Usually, in this case, the parting line of the product is on the visible surface, and the parting line cannot be eliminated. At the same time, a certain amount of trimming and polishing work is required.