PU film referred to as polyurethane film, as a new material in the medical aspects of the role of more and more widely, the excellent performance of its materials make people pay more attention to the role of medical PU coating film. Medical PU coated film is a kind of medical breathable tape, its good elasticity, mild high. In the waterproof on the thickness of very thin (0.012-0.035mm) there are other materials can not match the physical performance.