What is high-density polyethylene material

High density polyethylene (HDPE) is a synthetic resin material, specifically, it is a thermoplastic resin made by polymerization of ethylene monomers. High density polyethylene has the following main characteristics:
Physical and chemical properties:
High density polyethylene is an opaque white waxy material with a specific gravity lighter than water, ranging from 0.941 to 0.960. It is soft and tough, but slightly harder than low-density polyethylene (LDPE) and can also elongate slightly. It is non-toxic and odorless.
Its crystallinity is 80%~90%, softening point is 125~135 ℃, and the operating temperature can reach 100 ℃.
The hardness, tensile strength, and creep of high-density polyethylene are superior to those of low-density polyethylene; Good wear resistance, electrical insulation, toughness, and cold resistance; Good chemical stability, insoluble in any organic solvent at room temperature, resistant to acid, alkali, and corrosion by various salts.
Application areas:
High density polyethylene film has low permeability to water vapor and air, and low water absorption, so it is commonly used in the manufacture of films, packaging materials, containers, pipelines, monofilaments, wires and cables, etc.
It can also be used as a high-frequency insulation material for televisions, radars, and other applications.
Preparation method:
High density polyethylene is synthesized by polymerizing ethylene monomers under low pressure (0.48-3.1 MPa) and low temperature (80-110 ℃) conditions using Ziegler or Phillips type efficient catalysts.
Improved features:
Due to the poor aging resistance and environmental stress cracking resistance of high-density polyethylene, its performance is not as good as low-density polyethylene, especially under thermal oxidation. Therefore, it is usually necessary to add antioxidants and UV absorbers to the resin to improve these deficiencies.
In summary, high-density polyethylene is an important synthetic resin material with a wide range of industrial applications and specific physical and chemical properties.