Hytrel® Thermoplastic Polyester Elastomer 

About Hytrel® TPC-ET

Hytrel® is a 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. However, because all engineering materials are affected to some extent by temperature, moisture, and other environmental service conditions, it is necessary to determine the extreme operating conditions and to design a part that will perform satisfactorily under all these conditions.

The selection of the best material for any application requires the knowledge of the properties of all candidate materials and how they satisfy the requirements of the application. Hytrel® may be chosen for a job because of one, or a combination, of its properties. With this knowledge, and the information provided by the Design Guide, it is hoped that proper resin selection coupled with good design practice will result in the development of a successful part in the shortest possible time.

Properties and Characteristics

Hytrel® features exceptional toughness and resilience; high resistance to creep, impact, and flex fatigue; flexibility at low temperatures; and good retention of properties at elevated temperatures.


Hytrel® can be readily formed into high performance products by multiple thermoplastic processing techniques, including injection molding, extrusion, blow molding, rotational molding, and melt casting. Hytrel® is processed at temperatures between 180 and 260°C (355 and 500°F), depending on the process and polymer type. All standard grades have a specific melting point and very good melt stability.


The excellent properties of Hytrel® qualify it for a number of demanding applications where mechanical strength and durability are required in a flexible component. Examples include seals, belts, bushings, pump diaphragms, gears, protective boots, hose and tubing, springs, and impact-absorbing devices. In many of these applications, Hytrel® allows a multi-piece rubber, plastic, or even metal composite assembly to be replaced with a single part. For outdoor applications, Hytrel® should be protected from ultraviolet (UV) attack. Some of the industries where Hytrel® can be found include: automotive, fluid power, electrical/electronic, appliance and power tool, sporting goods, footwear, wire and cable (including fiber optics), furniture, and off-road transportation equipment.