PA ball is Polyamide ball. Polyamide plastic ball is also known as nylon plastic ball. PA balls’ features are acid and alkali resistance, corrosion resistance and high mechanical strength. PA balls have good wear resistance, heat resistance, oil resistance and chemical resistance, but also greatly reduce water absorption and shrinkage of the raw material. They also have excellent dimensional stability and excellent mechanical strength. PA balls are used in the application to check valve, light bearing and knob. And they are also suitable for better flexibility requirements and high hardness requirements. Meanwhile, nylon has a good alkali metal resistance, adapting to petroleum products and various characteristics chemicals.