PE (Polyethylene)
Physical and chemical properties
Polyethylene (PE) is a linear polymer with an extremely simple molecular structure consisting of repeated "-CH2-CH2-" units. This structure gives PE a variety of unique physical and chemical properties:
Lightweight: PE has a low density of approximately 0.91 to 0.96 g/cm³, making it a representative of lightweight materials.
Chemical corrosion resistance: PE exhibits good chemical stability to most acids, alkalis and salt solutions.
Electrical insulation: As a non-polar material, PE has excellent electrical insulation properties.
Low temperature resistance: PE can maintain its physical properties at temperatures as low as -70°C.
Thermoplasticity: PE can be reshaped after heating, which is convenient for recycling and reprocessing.
Processing methods
Polyethylene has various processing methods, mainly including the following:
Extrusion: used to produce pipes, insulation layers of wires and cables, etc.
Injection molding: suitable for making small containers, toys, etc.
Blow molding: used to produce hollow bottles and containers.
Compression molding: Suitable for making larger plastic parts.
Thermoforming: Used to make thin-walled packaging materials and pallets.
Application areas
Polyethylene has a wide range of applications, and the following are some of the main application examples:
Packaging materials: PE films are widely used in food packaging and commodity packaging because of their light weight and good protective properties.
Plastic pipes: HDPE pipes are often used to transport water and gas because of their chemical corrosion resistance and abrasion resistance.
Wires and cables: PE is widely used in the manufacture of wires and cables as an insulating material.
Agriculture: PE is used to make agricultural films, such as mulching technology.
Medical field: Due to its biocompatibility and chemical resistance, PE is also used to make certain medical devices.
Automotive industry: PE is used to make automotive parts such as fuel tanks and bumpers because of its light weight and impact resistance.
