WHY IS ALUMINUM AN EFFECTIVE SHIELD?
Aluminum is a prized material that can effectively shield electrical applications. This is in large part to its non-ferrous nature and high conductivity. Also, aluminum’s high strength-to-weight ratio, formability, and adaptability make it very efficient and easy to work with. Flexibility is always a great asset for any manufacturer, allowing for a cheap prototyping process and for changes to be made down the line when necessary.
A huge factor in shielding material is its electrical conductivity.
Every aluminum alloy has its own particular characteristics, so it’s important to know exactly what properties are necessary for your application when selecting a metal for the shield.
A chart like the one found here http://chemical-biological.tpub.com/TM-1-1500-335-23/css/TM-1-1500-335-23_404.htm
helpfully lays out the varying electrical conductivity rangers of various metals.