High-density polyethylene (HDPE) is a white powder or granular product. Non-toxic, odorless, crystallinity of 80% ~ 90%, softening point of 125 ~ l 35 °C, the use of temperature up to 100 °C; hardness, tensile strength and creep is better than low density polyethylene; wear resistance, Good electrical insulation, toughness and cold resistance; good chemical stability; in room temperature, insoluble in any organic solvent; resistant to corrosion by acids, alkalis, and various salts; thin film has low permeability to water vapor and air, absorbing water Low resistance; poor aging resistance, less resistance to environmental stress cracking than low density polyethylene, especially thermal oxidation will reduce its performance, so the resin must be added antioxidants and UV absorbers to improve this deficiency . The heat distortion temperature of high-density polyethylene film under stress conditions is low, so pay attention to the application.