Nu-Calgon 4218-12 Perma-Wrap Foam Insulation Tape is a high performance insulation tape designed for use in cold weather applications. It is a 12 mil thick, continuous roll insulation tape that is conformable and easy to apply. It is designed to provide thermal insulation and soundproofing in a variety of construction and industrial applications. Nu-Calgon 4218-12 Perma-Wrap Foam Insulation Tape is a high performance insulation tape designed for use in cold weather applications. It is a 12 mil thick, continuous roll insulation tape that is conformable and easy to apply. It is designed to provide thermal insulation and soundproofing in a variety of construction and industrial applications.