PEHDPE

PEHDPE, commonly known as high-density polyethylene or PE-HD, is a thermoplastic in the polyethylene family characterized by its relatively high density and linear molecular structure. With a density of about 0.941–0.965 g/cm3 and a semicrystalline nature, PEHDPE offers greater stiffness, higher tensile strength, and improved chemical resistance compared with lower-density polyethylenes. Its melting point lies around 120–130°C, and it maintains toughness over a wide temperature range, though some grades can become brittle at very low temperatures.

PEHDPE is produced by polymerizing ethylene using catalysts such as Ziegler-Natta or metallocene systems. The result is a material with good chemical resistance, low water absorption, and strong barrier properties to moisture. It processes well with extrusion, injection molding, and blow molding, enabling a broad range of part and product geometries.

Common applications include piping and fittings for drinking water, natural gas, and drainage systems; rigid bottles and containers for chemicals and foods; automotive components; geomembranes for landfill liners and water containment; plastic lumber and outdoor furniture; and various consumer goods. Its combination of strength, toughness, chemical resistance, and relatively low cost underpins its widespread use.

Recycling and environmental considerations: PEHDPE is widely recycled and is typically identified by the resin code 2. Recycled PEHDPE is used in piping, plastic lumber, and other non-food applications, though additive blends can affect suitability for some uses. Life-cycle analyses emphasize energy use in production and the importance of proper end-of-life management. In Europe and elsewhere, PE-HD is often denoted PE-HD or PE 100 for certain pipe grades.