Durable, lightweight thermoplastic for versatile manufacturing applications.

High Density Polyethylene (HDPE) is a widely used thermoplastic polymer known for its strength, durability, and cost-efficiency. As a type of polyethylene (PE), it is classified by its higher density range of approximately 0.941–0.965 g/cm³.

Despite being lightweight (less dense than water), HDPE offers an excellent strength-to-density ratio, making it ideal for durable plastic parts that must withstand impact, environmental exposure, and long-term use. It has a long lifespan, is resistant to corrosion and a wide range of chemicals, and maintains performance in both indoor and outdoor environments.

At Eck Plastic Arts, HDPE is commonly used for applications requiring chemical resistance, structural durability, and consistent performance across a wide range of industries.

Benefits of High Density Polyethylene (HDPE)

HDPE is widely used due to its balanced mechanical and physical properties, making it suitable for both functional and structural plastic components.

Key benefits include:

• • High strength-to-density ratio
  • Excellent chemical and corrosion resistance
  • Moisture and impact resistance
  • UV stability for outdoor applications
  • Lightweight yet durable performance
  • Fully recyclable material

These characteristics make HDPE a reliable and cost-effective solution for both indoor and outdoor applications.

For projects where material performance must align with manufacturing requirements, selecting the right resin early is critical.

Common Applications of HDPE Parts

HDPE serves a wide range of consumer, medical, and engineering applications due to its versatility and durability.

Typical applications include:

• • Fluid containers such as fuel tanks and medical storage units, where chemical resistance is critical
  • Consumer products including toys, bins, and outdoor furniture due to its durability and UV resistance
  • Food-safe containers such as milk jugs and storage solutions, as HDPE is FDA-compliant and dishwasher safe
  • Industrial piping systems for water, gas, and drainage
  • Chemical storage tanks and infrastructure components exposed to harsh environments

Its resistance to chemicals, moisture, saltwater, and environmental stress makes it particularly well-suited for demanding applications.

Depending on part geometry, wall thickness, and production requirements, these components may also be supported by Eck’s broader manufacturing capabilities, including plastic fabrication and injection molding.

HDPE vs. Other Plastics

Material selection depends on the specific performance requirements of the application.

HDPE vs Polypropylene (PP)

• • Polypropylene offers higher rigidity
  • HDPE provides greater impact resistance
  • HDPE performs better in outdoor and long-term exposure environments
  • PP is sometimes blended with HDPE in large-volume applications

HDPE vs ABS

• • ABS is better suited for high-load indoor applications such as housings
  • HDPE offers superior chemical resistance and UV stability
  • HDPE is more suitable for outdoor and heavy-duty environments

HDPE provides a strong balance of durability, environmental resistance, and cost-efficiency, making it a preferred choice for many industrial and outdoor applications.

For customers evaluating multiple material options, Eck Plastic Arts can help identify the most economical and technically suitable fit for the application.

Design Guidelines for HDPE Parts

Proper part design is critical to achieving optimal performance and manufacturability.

Recommended design considerations:

• • Wall thickness: 0.050″ – 0.120″ (up to 0.200″ maximum depending on application)
  • Account for shrinkage rates of approximately 1.5% – 4% to minimise warping
  • Use ribs (40–60% of wall thickness) to increase strength instead of adding bulk
  • Avoid sharp corners to reduce stress concentration
  • Apply draft angles of 1° – 2° for easier mold release
  • Use matte or textured finishes to minimise visible sink marks or scratches

Following these guidelines helps ensure consistent quality, durability, and production efficiency.

If your part requires support beyond material selection, Eck Plastic Arts also provides design-informed manufacturing support across multiple processes, including injection molding and thermoforming.

Material Properties of High Density Polyethylene