Alkali treatment is one of the most common treatment of the lignocellulosic fillers. This process is a purifying treatment that removes waxes, pectin, hemicellulose and lignin from the filler surface. Sharifah et al. (2004) examined the effect of alkali treatment on fiber density and surface topography of hemp fiber. Hemp fibers were treated with 6 wt% of sodium hydroxide (NaOH). After alkali treatment, fiber densities were increased due to cell wall densification. SEM micrographs revealed that the fiber surface of alkali treated fibers was rougher than that