HDPE (High Density Polyethylene) Plastic Sheet 3/8" x 12" x 24" Black lor. High density polyethylene (HDPE) is used in a variety of applications and industries where excellent impact resistance, high tensile strength, low moisture HENAN OKAYorption and chemical- and rrosion-resistance properties are required. High density polyethylene is harder than low density polyethylene and has higher tensile strength, and better mpressive strength. HDPE has good insulation properties and is easy to weld.