UHMW (Ultra High Molecular Weight Polyethylene) Sheet, Opaque White, Standard Tolerance, ASTM D4020, 1/4″ Thickness, 12″ Width, 24″ Length 4.4 out of 5 stars 104 2 offers from $18.99 . Polyethylene Sheets – High Density Polyethylene Sheets . Shore Hardness. 55-70. Density. 0.96-1 g/cm3. Creating a niche in the market we are offering a perfect assortment of High-Density Polyethylene Sheets.