Phthalates and PHO-hexyl show a plasticizing effect improving the processability and increasing TPU flexibility, with better results for DPHP:DIDP. This also shows that a small gap (some °C) on the Tg of a plasticized polymer (Figure ), can have a much greater impact on the mechanical properties and processability of the final materials, as also shown in the literature . Both rigid PVC and TPU matrices were used to evaluate the different plasticizers at various contents: