Foil Shield Defined
A foil shield is an aluminum foil surrounding the components or core of a cable. It is used in several types of cables and is a lower cost effective means of shielding the cable from RF signals.Foil-in and Foil-out
Foil shields are aluminum foil and have a plastic backing to lend strength in the manufacturing process. Foil in or out indicates whether the foil is facing the core (in) or facing the jacket (out).