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Microphotographs of the composites (a) sample without eco-filler; (b) sample with 5 wt.% of eco-filler; (c) sample with 10 wt.% of eco-filler; (d) sample with 20 wt.% of eco-filler; and (e) sample with 30 wt.% of eco-filler. Magnification 5×.
