3M™ Copper EMI Shielding Tape 1181, 3-1/2 x 18 yd, 3 Rolls/Case. 3M™ Copper Foil EMI Shielding Tape 1181 is a conductive adhesive shielding tape that is designed for applications that require reliable, point to point electrical contact. It comes on a removable liner for easy die cutting and handling. The tape is rated for 600V dry applications.