I-6640 ifilimu ye-Polyester / i-polyaramide i-fiber paper flexible laminate (NMN) yi-layer ye-flexible composite insulation paper apho icala ngalinye lefilimu ye-polyester (M) idibaniswe kunye nomgca omnye wephepha le-polyaramide fiber (Nomex). Ikwabizwa ngokuba yi-6640 NMN okanye i-F yeklasi ye-NMN, iphepha le-NMN lokugquma kunye nephepha le-NMN lokugquma.