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(a) Flexural strength, (b) Izod impact strength, and (c) hardness (Shore D) of WPVC composites containing 0–100 pph of Bi2O3 and 20–40 pph of wood particles, where error bars = ± standard deviation. The red-dashed lines represent flexural strength, Izod impact strength, and hardness (Shore D) of a neat PVC obtained from [37,38,39].
