High Density Polyethylene (HDPE)

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High Density Polyethylene (HDPE)
A linear polymer, High Density Polyethylene (HDPE) is prepared from ethylene by a catalytic process. The absence of branching results in a more closely packed structure with a higher density and somewhat higher chemical resistance than LDPE. High Density Polyethylene is also somewhat harder and more opaque and it can withstand rather higher temperatures (120° Celsius for short periods, 110° Celsius continuously). High density polyethylene lends itself particularly well to blow molding. (Source: Dynalab Corporation).

Advantages of High Density Polyethylene

Impact, and wear resistant. Flexible, can have very high elongation before breaking. Generally good chemical resistance.

Food Contact Acceptable
Processability, Good
Copolymer
ESCR, High (Stress Crack Resist.)
Antioxidant
Density, Low
Density, High
Impact Resistance, Good
Toughness, Good

Disadvantages of High Density Polyethylene

Sensitive to thick sections in your part. It may have voids, bubbles or sink. Poor dimensional accuracy. Low mechanical and thermal properties. Price is low to very low.

High thermal expansion
Poor weathering resistance
Subject to stress cracking
Difficult to bond
Flammable
Poor temperature capability
Low strength/stiffness

Background of High Density Polyethylene

After its experimental preparation in the 1930s the application in high frequency radar cables during World War II gave impetus to its commercial production. Today Polyethylene (PE) is one of the most widely used plastics with production in the billions of pounds each year.

Additional descriptive content about High Density Polyethylene can be found on the Dow Plastics website.

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