Polyurethane is a plastic made from two main components, polyol and aliphatic isocyanate, to which a pigment is added. In the door manufacturing process, the PU resin is automatically poured onto the door, ensuring a smooth, permanent bond. Doors with a PU finish are impact-resistant, easy to maintain, and hygienic. PU is available in a wide range of colors. Since PU is colored throughout, any minor wear and tear is less noticeable. PU is often used in environments where doors are subjected to heavy use.