6641 Polyester film/polyester non-woven flexible laminate (Kalasi F DMD) ndi pepala lopindika la magawo atatu lopindika lopangidwa ndi filimu ya poliyesitala yosungunuka kwambiri komanso nsalu yabwino kwambiri yopukusa poliyesita yosawomba. Mbali iliyonse ya filimu ya poliyesitala (M) imamangidwa ndi nsalu ya polyester yopanda nsalu (D) yokhala ndi zomatira za Gulu F. Kalasi yotentha ndi F kalasi, Imatchedwanso kuti 6641 F kalasi DMD kapena Class F DMD insulation paper.