When exposed to high temperatures or flames, this flexible ceramic fiber-based mat expands to form a low-density insulation material that helps block the spread of fire and retards heat transfer; 25 ft. x 49 in. x 3/16 in. roll, 1-side aluminum foil. 3M(TM) Interam(TM) Mat I-10A can be easily cut and wrapped around complex shapes and surfaces such as electrical raceways and fire-rated roofing systems. In addition, the intumescent properties of the mat allow it to act as a high-temperature seal and gasketing material in applications such as industrial furnaces.