in several markets (packaging, automotive, electrical, etc.). High-density polyethylene definition, polyethylene consisting mainly of linear, or unbranched, chains with high crystallinity and melting point, and density of 0.96 or more, produced at low pressure and used chiefly for containers and articles made by injection molding. LLDPE (Linear-Low Density Polyethylene) is defined by a density range of 0.915 - 0.925 g/cm 3. is a substantially linear polymer, with significant numbers of short branches, commonly made by copolymerization of ethylene with short-chain alpha-olefins (e.g. In chemistry, n acts as a placeholder for a number.N gives you some idea about the potential length of the chain. HDPE is a type of polyethylene, the most common plastic which accounts for over 34% of the global plastic market. Summary – Polyolefin vs Polyethylene. Polyethylene (PE) is an organic polymer made by the polymerization of monomer subunits. Physical Chemistry and Mechanical Properties of HDPE High-density polyethylene (HDPE)(0.941