Plastic materials

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　　(1) HDPE High Density Polyethylene, abbreviated as “HDPE”, is a thermoplastic resin with a high degree of crystallinity and non-polarity. Native HDPE has a milky white appearance, and its thin cross-section is somewhat translucent. PE has excellent resistance to most household and industrial chemicals. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons (xylene), and halogenated hydrocarbons (carbon tetrachloride). This polymer is non-hygroscopic and has good vapor resistance, making it suitable for packaging applications. HDPE has excellent electrical properties, particularly a high insulation dielectric strength, which makes it very suitable for use in wires and cables. The medium to high molecular weight grades possess excellent impact resistance, both at room temperature and even at low temperatures of -40°F. 　　(2) LDPE Low-density polyethylene (LDPE) is a plastic material that is suitable for various thermoplastic molding processes, offering good processability. The main use of LDPE is in film products; it is also used in injection-molded items, medical devices, packaging materials for medicines and food, as well as in blow-molded hollow products. 　　(3) LLDPE Linear low-density polyethylene, which is structurally different from ordinary low-density polyethylene due to the absence of long side chains. The linearity of LLDPE depends on the different production processes of LLDPE and LDPE. LLDPE is typically produced by the copolymerization of ethylene and higher alpha-olefins such as butene, hexene, or octene at lower temperatures and pressures. The LLDPE polymer produced during the copolymerization process has a narrower molecular weight distribution than conventional LDPE, and its linear structure confers upon it different rheological properties.