The material of PVC pepperball PVC is a common plastic, and the material will produce an acidic climate during injection molding, which will corrode the pepper ball mold, so the mold manufacturing method of PVC pepper ball is very different from that of ordinary pepper ball mold, and the shrinkage rate of PVC pepper ball is also different with different hardness, so the shrinkage rate of the mold should be designed according to the hardness of PVC.Generally, the die core of PVC pepper ball mold is S136H, which has good corrosion resistance and does not rust. Moreover, after heat treatment, this steel has high hardness and is not easy to deform. It is an ideal die core material for PVC pepper ball mold. The calculation of shrinkage rate of PVC mold should be based on the hardness of PVC material, and the corresponding shrinkage rate should be provided by the material supplier for reference. The shrinkage rate of PVC material calculated blindly is likely to be unqualified.