High density polyethylene (HDPE) is the most used of the three polyethylene’s for a wide range of applications.

HDPE is a thermoplastic polyethylene. It has a linear structure with no or low degree of branching. It is produced majorly using two techniques: Slurry Polymerization or Gas Phase Polymerization.

Manufactured at low temperatures of between 70 to 300 °C and pressures of 10-80 bar, the density of HDPE ranges from 930 to 970 kg/m3. The linear structure and high density of this

polyethylene provide high crystallinity and thus high tensile strength, especially compared to other types of polyethylene.

Some of the different properties of HDPE are as

following:

Relatively stiff material with useful temperature capabilities

Low cost polymer with good processability

Good low temperature resistance

Good toughness at low temperatures

Excellent electrical insulating properties

Deficient water absorption

Excellent resistance to most solvents

Excellent resistance to alcohols, dilute acids, and alkalis

Moderate resistance to oils and greases

Poor resistance to hydrocarbons (aliphatic, aromatic, halogenated)