6640 Filime ya polyester / polyaramide fibre impapuro zoroshye laminate (NMN) nimpapuro eshatu zoroshye guhuza impapuro zo kubika aho buri ruhande rwa firime ya polyester (M) ihujwe nigice kimwe cyimpapuro za fibre polyaramide (Nomex). Ihamagarira kandi nka 6640 NMN cyangwa F icyiciro cya NMN, impapuro zo kubika NMN hamwe nimpapuro za NMN.