High-density polyethylene (HDPE) has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, good mechanical strength, dielectric properties, and environmental stress cracking resistance. Hardness, tensile strength and creep are better than low-density polyethylene; wear resistance, electrical insulation, toughness and cold resistance are better, but slightly worse than low-density insulation; chemical stability is good, at room temperature Under certain conditions, it is insoluble in any organic solvent, resistant to acid, alkali and various salts; the film has low permeability to water vapor and air, and low water absorption; poor aging resistance, environmental cracking resistance is not as good as low-density polyethylene, In particular, thermal oxidation will reduce its performance. Therefore, the resin needs to be added with antioxidants and ultraviolet absorbers to improve this deficiency. High-density polyethylene film has a low heat distortion temperature under stress, which should be paid attention to when applying it.
