Composites of polyethylene matrices and fillers consisting of finely ground pistachio shells and sunflower husks were manufactured. These materials were subjected to a series of tests for the purpose of examining their processing qualities, physical, mechanical and thermal characteristics, flammability and resistance to environmental factors, determining their feasibility and application paths. The relationship between the natural fiber composites' morphology and stability was described. Based on the obtained test results, the influence of the lignin content and secondary components in the fillers' structure on the thermal stability of the composites was confirmed. It was also proven that the porosity of the composites and the hemicellulose content in the filler influenced the composites' capacity to take up considerable amounts of water.
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Sałasińska et al. (2016) studied this question.