Add to basket. 2000 x 1000 x 15mm Natural HDPE - High Density Polyethylene Sheet Grade 300. HDPE sheets are a smooth finished, high impact engineering thermoplastic with many High Density Polyethylene (HDPE) Sheet High Density Polyethylene (HDPE) Sheet. This sheet can be heat formed, shaped, and welded to fabricate ducts, hoods, and much more.