3M Aluminum Foil Shielding Tape 1170 consists of a 1-ounce deadsoft aluminum foil backing and a unique electrically conductive pressure-sensitive acrylic adhesive.
3M 1170 Tape is typically used for applications requiring excellent electrical conductivity from the application substrate through the adhesive to the foil backing.
Common uses include grounding and EMI shielding in equipment, components, shielded rooms, etc.
Many factors determine the true shielding effectiveness of a shielding tape, including...
Type and thickness of foil
Intimacy of contact
Smoothness of application surface
Strength and frequency of the EMI signal, etc.
However, using standard tests and fixtures, it is possible to determine a value for the attenuation. For 3M 1170 Tape, typical shielding effectiveness (far field) is in the range of 60dB to 75dB (30 MHz to 1 GHz).