Thermal properties of polyurethanes are influenced mainly by molecular weight between the cross links , degree of segments in stiff sequence. TPU provides a large number of physical and chemical property combinations for the most demanding applications such as automotive, wires and cables, breathable films for leisure, sports and textile coatings, weatherable, non-yellowing films etc. Polyurethane varnish may also lack the "hand-rubbed" lustre of drying oils such as linseed or tung oil; in contrast, however, it is capable of a much faster and higher "build" of film, accomplishing in two coats what may require many applications of oil. Rigid polyurethane foams have become widely used as insulation materials because of their combination of low heat transfer and good cost effectiveness. With the vast amount of urethane combinations and formulations it is understandable that there are many urethane properties which benefit certain applications. Polyurethanes (PUs) are a class of versatile materials with great potential for use in different applications, especially based on their structure–property relationships. Thermoplastic polyurethane (TPU) is a melt-processable thermoplastic elastomer with high durability and flexibility. They can be thermosetting or thermoplastic, rigid and hard or flexible and soft. Hence, from the point of view of applications, it is possible to produce various polyurethanes, which properties can be easily modified by varying structures of soft and hard segments . Polyurethanes (PUs) are a class of versatile materials with great potential for use in di ff erent applications, especially based on their structure – property relationships. Urethane Properties, Benefits and Applications. The nature of polyurethanes chemistry is the central point for understanding why some polyurethanes are non-degradable and other undergo fast degradation. Study of the ageing of polyurethanes in general applications for UV radiation Fábio G. Aquino 1*, Fernanda M. B. Coutinho 2, Terry Sheldrake 1, Judimar Clevelario , Fábio Pires 1* Wellstream International – fabio.aquino@wellstream.com 2 Universidade do Estado do Rio de Janeiro - UERJ Polyurethanes are a class of polymer that present a wide range of mechanical properties. Polyurethanes Properties. Given this, polyurethane resins are having an impact now in processes and applications previously dominated by polyesters, vinyl esters and epoxies, while polyurethane foams are seeing use in new fiber-reinforced core materials. Pultrusion has been used for decades to manufacture a variety of structural composite parts. Their specific mechanical, physical, biological, and chemical properties are attracting significant research attention to tailoring PUs for use in different applications. Polyurethane (PUR and PU) is a polymer composed of organic units joined by carbamate (urethane) links. 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