PTFE [PTFE,F4] is one of the best corrosion-resistant materials in the world today, so the "plastic king " laudatory name. PTFE is a tetrafluoroethylene polymer, the English abbreviation for PTFE, the product is called "Teflon". The basic structure of PTFE is:-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-. PTFE is widely used in a variety of areas where acid and alkali resistance and organic solvents are required, and it is not toxic to humans, but one of the raw materials used in the production process, PFOA, is thought to be carcinogenic.
Able to work long-term at temperatures from +250℃ to -180℃, in addition to molten metal sodium and liquid fluorine, capable of all other chemicals. Polyethylene: referred to as PE, is a thermoplastic resin made of ethylene by polymerization. It has excellent low temperature resistance (minimum operating temperature up to -70~-100℃), good chemical stability and resistance to most acid-base erosion (not resistant to oxidizing acids). At room temperature insoluble in general solvents, water absorption is small, electrical insulation performance is excellent; but polyethylene is very sensitive to environmental stress (chemical and mechanical action) and is poor in heat aging.
The properties of polyethylene vary depending on the species and depend mainly on the molecular structure and density.
Abbreviation: nch2=ch2→ Divided into three kinds of high-pressure method, low-pressure method and medium-pressure method. High-pressure method is used to produce low density polyethylene. The properties of polyethylene vary depending on the species and depend mainly on the molecular structure and density.