HDPE (High Density Polyethylene) is a thermoplastic polymer made from petroleum. Known for its outstanding tensile strength and large strength-to-density ratio, HDPE plastic has a high-impact resistance and melting point. As one of the most versatile plastic materials around, HDPE plastic is used in a wide variety of applications,including plastic bottles, milk jugs, shampoo bottles, bleach bottles, cutting boards, and piping.