When selecting materials for urban outdoor furniture, durability becomes a paramount concern. Both polyethylene resin—particularly high-density polyethylene (HDPE)—and aluminum are popular choices, but they offer distinct advantages and challenges in harsh city environments.
Aluminum furniture is renowned for its inherent strength and structural integrity. It is resistant to rust, unlike iron or steel, especially when powder-coated or anodized. This coating provides an additional barrier against moisture and UV radiation, preventing corrosion and fading. However, this protective layer can chip or scratch over time, exposing the raw metal to the elements and potentially leading to deterioration. In terms of pure structural strength and resistance to impact, aluminum generally holds an advantage, making it suitable for high-traffic public spaces.
Polyethylene resin, specifically HDPE, excels in different areas. It is a polymer highly resistant to moisture, making it completely impervious to rot, rust, and corrosion. It does not require protective paints or sealants. HDPE is also highly resistant to UV radiation; the color is typically solid throughout the material (through-bodied), so it does not peel or fade significantly. While it may not bear extreme point loads as well as aluminum, its flexibility allows it to withstand impacts without denting. A key drawback is that it can become brittle in extreme, sustained cold.
For overall longevity with minimal maintenance, polyethylene has a clear edge. It never needs repainting or rust treatment. Aluminum, while strong, often requires periodic touch-ups to its finish to maintain its appearance and prevent corrosion. For urban settings prioritizing low upkeep and consistent appearance despite constant exposure to sun and rain, polyethylene resin often proves to be the more durable choice in the long term.