Careful circuit design can minimize EMI, but additional shielding measures are often required.
Expanded metal foils are versatile, effective EMI shielding materials. EMFs are formed from thin metal foils, creating a lightweight, strong and flexible sheet material. Expanded copper foil is commonly used for EMI shielding, but aluminum, nickel, Monel and stainless-steel foils can also be used when there are unique specifications.
Source: IEEE Semiconductors