6640 Polyester film / polyaramide pepa fibre laminate fetuutuunai (NMN) o se pepa insulation composite fetuutuunai tolu-laupapa lea o loʻo faʻapipiʻiina itu taʻitasi o le polyester film (M) i le tasi vaega o le pepa fiber polyaramide (Nomex).E taʻua foʻi o le 6640 NMN poʻo le F vasega NMN, NMN pepa faʻapipiʻi ma NMN pepa faʻapipiʻi.