SUBMITTALS AND QUALITY ASSURANCE 2.1. What is High-Density Polyethylene? [1] With a high strength-to-density ratio, HDPE is used in the production of plastic bottles, corrosion-resistant piping, geomembranes and plastic lumber. HDPE has a comparatively high density compared to other polymers, with a specific gravity of 0.95. ICI was granted a patent on its process in 1937 and began commercial production in 1939. The high degree … LDPE (Low Density Polyethylene) is defined by a density range of 0.910 - 0.940 g/cm3. High-density polyethylene (HDPE)(0.941