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6640 NMN Nomex paper polyester film flexible composite insulation paper
Ang 6640 Polyester film/polyaramide fiber paper flexible laminate (NMN) ay isang three-layer flexible composite insulation paper kung saan ang bawat gilid ng polyester film (M) ay pinagdugtong ng isang layer ng polyaramide fiber paper (Nomex). Tinatawag din itong 6640 NMN o F class NMN, NMN insulation paper at NMN insulating paper.