HDPE

material

High-Density Polyethylene, a thermoplastic polymer made from ethylene with a linear molecular structure and density range of 0.941-0.965 g/cm³, offering excellent chemical resistance and durability.

In Simple Terms

HDPE is a strong, rigid plastic with minimal branching in its molecular chain, giving it higher density and strength compared to LDPE. It's commonly used for containers, pipes, and outdoor applications due to its excellent chemical resistance and environmental stress crack resistance.

Why It Matters

HDPE represents a major segment of the polyethylene market with consistent demand across packaging, infrastructure, and industrial applications. Its recyclability and chemical inertness make it valuable for food contact and environmental applications, directly impacting pricing and availability in resin trading.

Technical Details

HDPE exhibits crystallinity levels of 60-80%, melting points of 120-130°C, and tensile strength of 22-31 MPa. Molecular weight distribution affects processability, with higher MW grades offering better environmental stress crack resistance but requiring higher processing temperatures. Melt flow rates typically range from 0.1-20 g/10min.

Real-World Examples

Blow molding grade procurement

Sourcing HDPE with MFR 0.3-0.7 for large container production, requiring certificates confirming environmental stress crack resistance and FDA compliance for food contact applications.

Pipe extrusion grade specification

Trading PE100 grade HDPE with specific long-term hydrostatic strength properties, requiring detailed material data sheets showing pressure rating classifications and UV stabilization levels.

Film grade quality control

Evaluating HDPE film grade with dart impact and tear strength specifications, analyzing gel content and contamination levels that could affect converting operations and end-use performance.