6641 Polyester film/polyester non-woven flexible laminate (Class F DMD) is a three-layer flexible composite insulation paper made of high melting-point polyester film and excellent hot-rolling polyester non-woven fabric. Each side of the polyester film (M) is bounded by one layer of polyester non-woven fabric (D) with Class F adhesive. The thermal class is F class, It is also called as 6641 F class DMD or Class F DMD insulation paper.