Heatshield Products 800101 1/8" Thick x 24" x 53" Heavy Duty HP Felt Shield Mat Reflective radiant continuous temperature 1100 degree Fahrenheit aluminium side Continuous direct contact temperature of 1800 degree Fahrenheit Heat shield mat is 1/8 inch thick May be used as direct insulation on exhaust system, felt side contacting heat source Face foil side towards heat source to act as a radiant heat shield barrier