100% pure lead foil tape coated with a compounded synthetic rubber adhesive system which exhibits excellent adhesion to a wide variety of surfaces, especially to metal, glass, films, foils, and papers. Highly malleable and can be shaped to the most intricate patter. Physical Properties: Backing 5 mil lead foil Adhesive blended rubber Tape Thickness (w/o liner) 6.5 mil Peel Adh..