3M electrical filament plastic cored tape 1076 is made of an electrical-grade paper backing, reinforced with scrim glass filaments and an oil-compatible acrylic pressure sensitive adhesive. Unlike conventional film-backed tapes, this products paper backing construction provides for complete impregnation and saturation of the tape in adjacent layers of insulation. - The 1076 plastic cored tape construction provides saturable backing to minimize the potential of voids, improved bonding with diamond paper insulation during transformer baking and excellent stiffness. This key feature minimizes the possibility of impregnation voids leading to corona discharges, with subsequent deterioration of insulating materials.