What are the best lightweight alloys for stackable metal outdoor seating?

When selecting materials for stackable metal outdoor seating, lightweight alloys are a top choice due to their durability, ease of handling, and resistance to weather conditions. The best options include:

1. Aluminum Alloys: Known for being lightweight yet strong, aluminum alloys like 6061 and 6063 are popular for outdoor furniture. They resist corrosion and require minimal maintenance.

2. Magnesium Alloys: Extremely lightweight and ideal for portable seating, though less common due to higher costs and lower corrosion resistance compared to aluminum.

3. Titanium Alloys: Exceptionally strong and corrosion-resistant, but often reserved for high-end designs due to their expense.

4. Stainless Steel Alloys: While slightly heavier, alloys like 304 or 316 offer excellent durability and rust resistance, making them suitable for coastal environments.

For stackable designs, aluminum alloys strike the best balance between weight, strength, and affordability, ensuring long-lasting performance in outdoor settings.