The choice between aliphatic and aromatic TPU films largely depends on the specific requirements of the end-use application. Aliphatic TPU is chosen for applications where non-yellowing characteristics and optical clarity are paramount, such as in surface protection films and optical lenses. Aromatic TPU, whether in the form of polyester or polycaprolactone, is often selected for applications where strength, elasticity, and chemical resistance are more critical, such as in industrial hoses and automotive parts. The chemical classes of TPU directly impact the film’s performance, durability, and suitability for various applications.