| Alloy Family | Principal Alloying Element | Feature | Common Use |
|---|---|---|---|
| 1xxx | None | 99% minimum pure aluminum | Electrical conductor |
| 2xxx | Copper | Very high strength | Aircraft |
| 3xxx | Manganese | Strength, formability | Siding, ductwork, roofing |
| 4xxx | Silicon | Joining | Welding products |
| 5xxx | Magnesium | Corrosion resistance | Boats, marine applications |
| 6xxx | Magnesium and Silicon | Strength | Structural shapes, pipe |
| 7xxx | Zinc | Very high strength | Aircraft |
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