Virgin LDPE (low-density polyethylene) and HDPE produced by Sabic in Geleen, The Netherlands and Riyadh, Saudi Arabia respectively, and homopolymer PP produced by Basell Orlen Polyolefins in Płock, Poland, were used for testing. A 50/50 mixture of LDPE and HDPE was used as the PE raw material. The PS, PET and PVC used were commercially available regranulates from mechanical recycling. As all materials were already in the form of 5 mm granules, there was no need for any additional pre-treatment. Samples of polymer mixtures were prepared as presented in Table 1.

Ratio between polymers in samples.

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