The manufacture of 0.68 caliber PA plastic pepper ball is made by injection molding process. However, because the shrinkage rate of PA plastic pepper ball is larger than that of other plastic pepper balls, the mold of PA plastic pepper ball is different from that of other materials. In addition, the precision of PA plastic pepper ball mold will also affect the precision of finished PA plastic pepper ball processed by post-bonding.

The mold material of 0.68 caliber PA plastic pepper ball should be made of hardened mold steel. Only in this way can the size of the PA plastic pepper ball blank be stable. Because the wear resistance of PA plastic pepper ball is better than that of other materials, the mold of PA plastic pepper ball should be made as small as possible. Only in this way can the work efficiency of adding PA plastic pepper ball be improved. Special grinding liquid should be used in the grinding process of PA plastic pepper ball, so that the processed PA plastic pepper ball can have processing accuracy.