In this study, the effect of reprocessing on properties
of WPC was investigated. The cylindrical profiles of 15
mm diameter were produced using a twin screw extruder.
The polymeric matrix was HDPE (40% by weight) with
an MFI ¼ 20 g/10 min. At the first stage of production,
WPC profiles, designated as WPC-V (virgin WPC), were
produced. Specimens were randomly selected and the
remains were ground to obtain WPC granules. The gran-
ules were then used in the production of the reprocessed
WPC, designated as WPC-R. Mechanical and physical
tests were performed on the samples of WPC-V and
WPC-R. It was found that WPC-R samples show lower
tensile and flexural strength, while higher flexural modu-
lus. The lower strength of the recycled samples was in
good agreement with their lower density. Produced pro-
files from the recycled materials showed higher water
absorption indicating less dimensional stability. Differen-
tial scanning calorimetry results indicated noticeable
decrease in crystallinity for virgin WPC compared to the
neat HDPE, while the decrease at the second stage of pro-
duction for WPC-R samples is not intense. Melting point
increased slightly for the virgin WPC with respect to the
neat HDPE and for the recycled WPC was the highest.