HDPE

HDPE (High-Density Polyethylene) is one of the most cost-effective and versatile thermoplastics available, combining excellent chemical resistance, outstanding impact strength even at low temperatures, and a very low moisture absorption rate. Its high strength-to-density ratio makes it a preferred material for chemical storage tanks, piping systems, and heavy-duty containers. HDPE is readily weldable, easy to fabricate, and fully recyclable (resin code #2), making it both economically and environmentally attractive for large-volume industrial and consumer applications.

Mechanical Properties

• Density: 0.95 g/cm³
• Tensile Strength: 32 MPa
• Yield Strength: 26 MPa
• Elongation at Break: 600%
• Flexural Modulus: 1,100 MPa
• Hardness: Shore D 60
• Heat Deflection Temperature: 75°C @ 0.45 MPa
• Melting Point: 130°C
• Thermal Conductivity: 0.46 W/m·K
• Coefficient of Thermal Expansion: 18.0 × 10⁻⁵ /°C
• Water Absorption: <0.01%
• Flammability Rating: V-0 (UL94)

Advantages

🟢  Excellent chemical resistance — resists a wide range of acids, bases, and solvents at room temperature; ideal for chemical handling and storage

🟢  Outstanding impact strength even at –40°C — ductile failure mode makes it safe for cryogenic and outdoor applications

🟢  Very low moisture absorption (<0.01%) — exceptional dimensional stability in humid and submerged environments

🟢  Low cost and wide availability — one of the most economical engineering plastics, available in large stock shapes and film forms

Machining & Manufacturing

Common Applications