Hot-cast polyurethanes are also advantageous in that they can be used to create harder elastomers. This means that they deform less than other elastomers under the same load. Heavy, repeated deformation can lead to the failure of lower hardness elastomers under high loads.
Tom Peter, Technical Service and Development Director, North America, for the Urethane Systems business unit at LANXESS, explains that “the improved hysteresis and low energy loss mean that there is also lower rolling resistance, which is a crucial factor for wheels of both roller coasters and inline skates.”
All in all, the properties of cast polyurethane are an excellent match for the needs of the solid wheel market. Advances and improvements in cast polyurethanes have resulted in specialty, high value products that have even lower energy loss, higher abrasion resistance, cracking resistance, and high temperature performance, to meet the advanced needs of high performance wheel applications.