CNC Machining in Polyethylene – What is PE (Polyethylene) Plastic? PE plastic can be processed with several subtractive machining techniques, polyethylene CNC machining services at Junying can supply highly accurate polyethylene parts, components, and accessories. What is Polyethylene or PE plastic? Polyethylene (PE or Polythene) is the most commonly used plastic now, especially in the packaging industry. PE plastic is