High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a polyethylene thermoplastic made from petroleum.
HDPE is known for its large strength to density ratio. The density of HDPE can range from 930 to 970 kg/m3. Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength than LDPE. The difference in strength exceeds the difference in density, giving HDPE a higher specific strength. It is also harder and more opaque and can withstand somewhat higher temperatures (120°C/ 248 °F for short periods). High-density polyethylene, unlike polypropylene, cannot withstand normally required autoclaving conditions. The lack of branching is ensured by an appropriate choice of catalyst (e.g., Ziegler-Natta catalysts) and reaction conditions

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HDPE has good heat and cold resistance, good chemical stability, but also has high rigidity and toughness, good mechanical strength. Dielectric property, environmental stress cracking resistance is also good. The hardness, tensile strength and creep property are better than low density polyethylene. Good wear resistance, electrical insulation, toughness and cold resistance, but slightly worse than low density insulation; Good chemical stability, at room temperature, insoluble in any organic solvent, acid, alkali and all kinds of salt corrosion resistance; Thin film to water vapor and air permeability is small, low water absorption; The aging resistance is poor, the environmental cracking resistance is not as good as low density polyethylene, especially the thermal oxidation will reduce its performance, so the resin needs to add antioxidants and ultraviolet absorbent to improve the deficiency in this respect. The thermal deformation temperature of high density polyethylene film under stress is low, which should be paid attention to when applied