6640 Polyester film/polyaramide fiber paper flexible laminate (NMN) ndi mapepala atatu osanjikiza osakanikirana omwe mbali zonse za filimu ya polyester (M) zimagwirizanitsidwa ndi pepala limodzi la polyaramide fiber (Nomex). Imatchedwanso 6640 NMN kapena F class NMN, NMN insulation paper and NMN insulating paper.