PCU is a type of TPU, not a separate or superior material. As a raw material, polycarbonate-based TPU (PCU) tests better than standard aliphatic TPU on hydrolysis and heat resistance, but worse in cold, and those lab differences do not automatically make a better finished film. For most drivers and climates, a quality aliphatic TPU film delivers everything needed. Read the full technical guide: PCU vs TPU PPF.