6640 Ko te kiriata polyester/pepa muka polyaramide laminate flexible (NMN) he pepa whakahiato hiato e toru nga paparanga e hono ana ia taha o te kiriata polyester (M) ki tetahi paparanga o te pepa muka polyaramide (Nomex). Ka karangahia ano ko te 6640 NMN, ko te F akomanga NMN, ko te pepa whakamarumaru NMN me te pepa whakamarumaru NMN.