Hytrel® is the Celanese registered trademark for its brand of thermoplastic polyester elastomers. The polyether-ester block copolymers combine many of the most desirable characteristics of high-performance elastomers and flexible plastics. Hytrel® offers a unique combination of mechanical, physical, and chemical properties that qualifies it for demanding applications. The various grades of Hytrel® exhibit a wide range of flexibility/stiffness and processing capabilities.