6640 Polyester zaj duab xis / polyaramide fiber ntau daim ntawv hloov pauv tau laminate (NMN) yog ib txheej peb-txheej flexible composite rwb thaiv tsev ntawv uas txhua sab ntawm polyester zaj duab xis (M) yog sib koom nrog ib txheej ntawm polyaramide fiber ntau ntawv (Nomex). Nws tseem hu ua 6640 NMN lossis F chav kawm NMN, NMN rwb thaiv tsev ntawv thiab NMN insulating ntawv.