Microwave and RF Absorbing Materials

ARC Technologies, a Hexcel Company, is the leading supplier of microwave and RF absorbing materials for commercial and defense applications.

RF Interference Control | Hexcel

Wave-X™ Near Field Absorbers | Hexcel

RF Interference Control | Hexcel

ARC 0.030" 13446 Datasheet

ARC 0.020"13444 Datasheet

Notes:

Aluminum doesn't block magnetic waves. Magnetic waves and electromagnetic waves, though related, are different. Aluminum is effective at blocking electromagnetic waves, especially at higher frequencies like radio and light waves. This is why aluminum foil is sometimes used to block radio signals.

For magnetic waves, however, aluminum acts like air because magnetic permeability of aluminum is very close to that of air. This means magnetic waves pass through aluminum just as easily as they pass through air.

If you need to block magnetic fields, you should use materials called ferromagnetic materials like steel or iron. These materials have a much higher magnetic permeability than air or aluminum, and they can significantly weaken magnetic fields.

That's it !