Pumice powder filling improves the water absorption behavior of walnut husk/epoxy composites, but decreases their elongation at break.
Researchers tested the effect of pumice powder on walnut husk/epoxy composites. They found that adding pumice powder reduced water absorption, but decreased the composites' flexibility. This suggests that pumice powder can improve the composites' water resistance, but at the cost of their durability.
Abstract
In the present study, three different walnut husk particles were applied as reinforced material used for manufacturing epoxy-based composites, and the influence of pumice powder content (20wt%) on the water absorption, and elongation at break properties of composites was investigated. Composites were prepared by hand lay-up method. Water absorption of the composites decreased with adding filler content. Finally, was concluded that pumice powder-filled is effective for improving the performance of walnut husk/epoxy composites. This behavior was found to relate to the efficient modification of the hydrophilic characteristics of walnut husk particles. However, The elongation at the break of composites significantly decreased with adding of the pumice powder.
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