ʻO 6640 Polyester film/polyaramide fiber pepa flexible laminate (NMN) he ʻekolu-layer flexible composite insulation pepa i hoʻopaʻa ʻia kēlā me kēia ʻaoʻao o ka polyester film (M) me hoʻokahi papa o ka pepa fiber polyaramide (Nomex). Kāhea ʻia ʻo ia ʻo 6640 NMN a i ʻole F papa NMN, NMN pepa insulation a me NMN insulating pepa.