0.68 caliber plastic pepper balls are different in polishing process and polishing technology due to different materials. Plastic hollow pepper balls made of different materials should be polished by different polishing processes. Generally speaking, the higher the hardness, the better the polishing effect and the higher the precision.

Due to the high hardness of POM plastic pepper ball, the polished surface of POM plastic pepper ball has mirror effect and high precision, which can be less than 0.01 mm.

PA plastic pepper ball has better toughness and wear resistance than POM plastic pepper ball. Polishing should be done in two steps, including rough polishing and fine polishing. PA plastic pepper ball has the characteristics of water absorption and expansion, so the accuracy of PA plastic pepper ball will change due to temperature and humidity.

Because the hardness of PP plastic pepper ball is not high, the polishing process should be divided into two processes: rough polishing and fine polishing. PP plastic ball does not absorb water, so the precision of the finished plastic pepper ball after processing will be very stable, and the surface smoothness is not as good as POM plastic pepper ball.