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SEM images of the surfaces of abaca and coir fibers with treatment in a 5% solution of NaOH for 1 h (A): abaca fiber bundle (MAG 750 x), (B): detailed view of the surface of an abaca fiber (MAG 3.50 kx), (C): coir bundle (MAG 750 x), (D): detailed view of the surface of a coir fiber (MAG 3.50 kx).
