Foil Emi Shield
September 26th, 2010 | 
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 10M Adhesive Copper Foil EMI Shield Tape Double-side Conductive 35mmX0.1mm,7902 US $16.99 
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Is aluminum foil good for shielding EMI?
The answer depends upon whether your objective is to reflect or absorb the EMI in your effort to create a shield (the distinction can be quite important in your overall design), and the frequencies of interest. Aluminum, steel and copper alloys all have somewhat different characteristics and serve better for one application or another.
At most frequencies, aluminum -- *especially* the thin stuff, isn't all that great at absorbing EMI, and if you need to keep the RF from *escaping* from your design, you'll find it tends to bounce the RF around until it finds a seam somewhere else to escape. On the EMC side, if you're trying to protect your gear from inbound EMI, it can serve better in that fashion.
On the other hand, steel will do a better job of absorbing EMI than aluminum at most frequencies, allowing you to push it to an earth ground through well bonded steel parts.
To the poster above --you're correct about the copper tape -- even the silver tape that EMI engineers use isn't aluminum. It's tin plated copper.
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