High crystallinity of HDPE is a thermoplastic resin, non-polar. HDPE is nontoxic, tasteless, odorless white granule, melting point of about 130 ℃, relative density is 0.941~0.960. It has excellent heat and cold resistance, good chemical stability, but also has high rigidity and toughness, the mechanical intensity is good. Dielectric properties and resistance to environmental stress cracking is also good. Melting temperature of 120~160℃. For larger materials, suggested the melting temperature range between 200~250℃. High-density polyethylene is species white powder particles-like products, nontoxic, and tasteless, density in 0.940~0.976 g/cm3 range within; Crystal degrees for 80%~90%, softening points for 125~135℃, using temperature can up 100 ℃; hardness, and stretch strength and creep degeneration is better than low density polyethylene; wear sex, and electric insulation sex, and toughness and the Hardy sex are better, but and low density insulation sex compared slightly poor some; chemical stability good, in at room temperature conditions Xia, not dissolved Yu any organic solvent, acid, and Alkali and salt corrosion film of water vapor and air permeability of small, low water absorption and anti-aging performance, environmental cracking resistance than LDPE, particularly thermal oxidation will decrease its performance, so resin added antioxidants and UV absorbers to improve this inadequacy.