Does aluminum foil block electromagnetic fields (EMF)?

Aluminum, the material that tin foil is made of, does conduct RF (Radio Frequency) and as a result, can block wireless EMF. Its effectiveness depends upon how strong the EMF source is and how much foil is used. Effectiveness spans from “reasonably good” to “not so good” depending on those variations. Foil does not block ELF (Extremely Low Frequency).

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