3M embossed tin-plated copper foil tape 1345 shall be coated on one side with pressure sensitive adhesive, which shall not require heat, moisture or other preparation prior to or subsequent to application. The adhesive coating shall be smooth and uniform and be free of lumps and bare spots. There shall be no separator between adjacent layers of the roll. The tape shall perform at a temperature of -40 °F (-40 °C) to 266 °F (130 °C) without substantial loss of tensile or electrical properties. - 3M embossed tin-plated copper foil tape 1345 consists of an embossed 1 oz dead soft tin-plated copper foil backing and an aggressive pressure sensitive acrylic adhesive. The edges of the embossed pattern pressed into the foil cut through the adhesive layer to establish reliable metal-to-metal contact between the backing and the application substrate.