Plastic samples were taken from various sources -either found in the lab (e.g. Neoprene gloves or commercially available Nylon 6 pellets) or office (e.g. HDPE or LDPE carrier bags), or from consumer products of our daily use (fig. ). Included in the samples are the most prevalent types of plastics found as marine microplastics (PP, PE, PS, PU, PVC, PET, Nylon). Two samples of polyethylene were taken: high-and low-density polyethylene (HDPE and LDPE, respectively). Despite being chemically similar, they are structurally different which imparts significant differences in their mechanical properties. One of our PET samples indicated itself as recycled, so we assume the other one to be virgin. We generally did not distinguish the presence of any fillers, dyes or additives.