What is TPEE material (Hytrel) and what are its applications and characteristics?

TPEE (also called Hytrel®) is a high-performance engineering-grade elastomer. It has the advantages of high mechanical strength, good elasticity, impact resistance, creep resistance, cold resistance, bending fatigue resistance, oil resistance, chemical resistance and solvent erosion. And it has good processability, and can be filled, reinforced and alloyed. It has been widely used in the fields of auto parts, hydraulic hoses, cables and wires, electronic appliances, industrial products, stationery, and biological materials. We can also see hytrel diaphragm using in AOD pumps( Air-operated diaphragm pump).

Hytrel Diaphragm

TPEE (thermoplastic polyester elastomer) is a block copolymer containing polyester hard segments and polyether soft segments. TPEE has the elasticity of rubber and the strength of engineering plastics. The soft segment gives it elasticity, making it rubbery. The hard segments give it processing properties that make it plastic-like. Compared with rubber, TPEE has better processability and longer service life. Compared with engineering plastics, it also has the characteristics of high strength, and better flexibility and dynamic mechanical properties.

Heat resistance

TPEE has excellent heat resistance. The higher the hardness, the better the heat resistance. TPEE is used above 120°C, and its tensile strength is much higher than that of TPU. In addition, TPEE also has excellent low temperature resistance, and the brittle point of TPEE is lower than -70°C. The lower the hardness, the better the cold resistance, and most TPEE can be used for a long time at -40°C. Due to the balanced performance of TPEE at high and low temperatures, it has a very wide operating temperature range and can be used at -70~200°C.

Chemical resistance

TPEE has excellent oil resistance and is resistant to most polar liquid chemical media (such as acids, bases, amines and glycol compounds) at room temperature. Its resistance to chemicals increases with its hardness. TPEE has good anti-swelling performance and anti-penetration performance to most organic solvents, fuels and gases, and its permeability to fuel is only 1/3-1/300 of that of oil-resistant rubber such as neoprene, chlorosulfonated polyethylene, and nitrile rubber.

TPEE diaphragm or Hytrel diaphragm

Excellent general-purpose diaphragms for non-corrosive abrasive applications and high-flex life. FDA compliant material.


Hytrel®, Viton® and Teflon® are registered trademarks of DuPont™ Company.
Geolast® and Santoprene® are registered trademarks of ExxonMobil.
Saniflex™ and Wil-Flex™ are registered trademarks of Wilden®.