For use with stoves, fireplaces and furnaces. Designed to securely seal stove window glass in stove doors & openings. Withstands temperatures up to 1000 degrees. 3/4" x 1/8" x 6' For use with stoves, fireplaces and furnaces Designed to securely seal stove window glass in stove doors & openings Withstands temperatures up to 1000 degrees.