A thermoplastic resin made by polymerization of ethylene. In industry, it also includes ethylene and small amounts α－ Copolymers of olefins. Polyethylene is odorless, non-toxic and feels like wax. It has excellent low temperature resistance (the minimum service temperature can reach - 70 ~ - 100 ℃) and good chemical stability,
It can resist the erosion of most acids and bases (not resistant to acids with oxidizing properties), is insoluble in general solvents at room temperature, has small water absorption and excellent electrical insulation performance; However, polyethylene is very sensitive to environmental stress (chemical and mechanical action) and has poor heat aging resistance. The properties of polyethylene vary from variety to variety, mainly depending on molecular structure and density.
