PE is the abbreviation of polyethylene, which is a thermoplastic resin obtained by polymerization of ethylene. In industry, it also contains copolymers of ethylene and a small number of α-olefins. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the lowest operating temperature can reach -70 ~ -100 ° C), good chemical stability, and can resist most acid and alkali corrosion (not resistant to oxidation) nature of acid), insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation; but polyethylene is very sensitive to environmental stress (chemical and mechanical effects), and has poor heat aging resistance. The properties of polyethylene vary from species to species, primarily depending on molecular structure and density. Products with different densities (0.91-0.96g/cm3) can be obtained by using different production methods. Polyethylene can be processed by general thermoplastic molding methods (see plastic processing). China’s three-dimensional marijuana mylar bags are used to make films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for TVs and radars.