Custom HDPE nveyor Belt Roller High Density Polyethylene Sheet: 10mm to 30mm thick. On this page you can buy High Density Polyethylene, also referred to as HDPE or PE300, in full sheets and custom cut pieces in 10mm, 12mm, 15mm, 20mm, 25mm and 30mm thick. smooth 12mm 2 lor plastic sheets price 12mm White ...