HDPE has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. The dielectric property and environmental stress cracking resistance are also good. The hardness, tensile strength and creep property are better than those of low density polyethylene; Wear resistance, electrical insulation, toughness and cold resistance are good, but they are slightly worse than low density insulation.

Good chemical stability, insoluble in any organic solvent at room temperature, and resistant to acid, alkali and various salts; The membrane has low permeability to water vapor and air and low water absorption; The aging resistance is poor, and the environmental cracking resistance is not as good as that of low-density polyethylene, especially the thermal oxidation will reduce its performance.

Therefore, antioxidants and ultraviolet absorbers should be added to the resin to improve this aspect. The heat deformation temperature of HDPE film under stress is low, which should be noted in application.