Home » News » HDPE sheets 4×8 » 3/8″ machinable hdpe pad seller CNC Machining HDPE: Overview of HDPE Materials & Machining Jul 07, 2020 · High-density polyethylene (HDPE), also known as polyethylene high-density (PEHD), is a thermoplastic polymer that also can be called “alkathene” or “polythene” when used for HDPE pipes