Series # (Family)	Primary Alloying Element	Relative Corrosion Resistance	Relative Strength	Heat Treatment	Feature	Common Uses
1000	None	Excellent	Fair	Non-heat treatable	Conductivity	Electrical Conductors
2000	Copper	Fair	Excellent	Heat treatable	Strength	Aircraft
3000	Manganese	Good	Fair	Non-heat treatable	General Purpose	Roofing, siding, Rain-carrying items
4000	Silicon			Non-heat treatable	Corrosion	Welding fillers, brazing
5000	Magnesium	Good	Good	Non-heat treatable	Corrosion	Marine applications
6000	Magnesium, Silicon	Good	Good	Heat treatable	Strength	Structural shapes, pipes
7000	Zinc	Fair	Excellent	Heat treatable	High Strength	Aircraft