6640 Polyester ata tifaga / polyaramide pepa fibre laminate fetuutuunai (NMN) o se tolu-apa fetuutuunai pepa insulation tu'ufa'atasi lea o lo'o fusifusia itu ta'itasi o le ata polyester (M) i le tasi vaega o polyaramide pepa fiber (Nomex). E taʻua foʻi o le 6640 NMN poʻo le F vasega NMN, NMN pepa faʻapipiʻi ma NMN pepa faʻapipiʻi.