cheap polyethylene sheet sizes 6mm supplier-HDPE high density Sheet thickness. Depending on the type of material, our plastic sheets are available in thicknesses of 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12mm, 15mm, 20mm, 25mm and 30mm.