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 poliyesitala 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 6641 F class DMD kapena Class F DMD insulation paper.