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6640 NMN Nomex takarda polyester fim mai sassauƙa mai hade da takarda mai rufi
6640 Polyester fim / polyaramide fiber takarda m laminate (NMN) takarda ce mai sassauƙa mai sassauƙa mai sassauƙa mai sassauƙa guda uku wanda kowane gefen fim ɗin polyester (M) yana ɗaure tare da takarda ɗaya na polyaramide fiber takarda (Nomex). Hakanan ana kiranta azaman 6640 NMN ko F class NMN, NMN insulation paper da NMN insulating paper.