Micro-injection moldings of poly(methyl methacrylate) filled with silica of various particle sizes ranging from 5 to 50 μm were fabricated. The distribution of the silica particles throughout the moldings was found to be significantly different, i.e. a more homogeneous distribution of fillers was evident as particle size decreases. Fracture properties, fracture surface appearance and transparency were significantly affected by the state of filler distribution.

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