This book is a compilation of interesting work on Polyurethane. It talks about the properties, characterization, and structures of polyurethane as well as provides information regarding Bio-based PU, including the R&D in these areas. The topics introduce the readers to the known as well as unknown applications of PU, like PU for fuel binding, alkanolamide PU coatings and foams, extraction of metals, and others. It aims to serve a wider audience including readers from the fields of industrial chemistry, polymer chemistry and materials chemistry.