Bertech High Temperature Polyimide Tape, 4" Wide x 36 Yards Long, 1 Mil Thick on a 3" Core RoHS Compliant Made of 1 mil thick polyimide film with 1.5 mil of silicone adhesive Used in applications at temperatures as low as -452 degrees F and as high as 500 degrees F Designed to be used for temporary masking purposes Also known as High Temperature Masking Tapes