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Excellent balance of flexibility and mechanical strength at elevated temperatures
Outstanding resistance to oils, greases, and common automotive fluids
Good processability via injection molding and extrusion with low moisture sensitivity
Retains elasticity and impact performance down to –40 °C
Low compression set for durable dynamic sealing and gasketing applications
Automotive under-hood components including air ducts and fluid handling connectors
Industrial power transmission belts and timing belt covers
Flexible couplings and vibration-damping mounts in machinery
High-performance sporting goods such as ski boot cuffs and bicycle suspension bushings
Medical device housings requiring sterilization compatibility and tactile feedback
| Chemical Type | Thermoplastic Polyester Elastomer (TPEE) |
| Product Form | Natural pellets, free-flowing |
| Appearance | Opaque off-white to light tan granules |
| Primary Applications | Dynamic mechanical parts requiring fatigue resistance and thermal stability |
| Key Features | High tensile strength, excellent creep resistance, broad service temperature range |
| Benefits | Design freedom vs. thermoset elastomers; recyclable processing; no vulcanization required |
| Density (ASTM D792) | 1.21 g/cm³ |
| Melt Flow Rate (230 °C/2.16 kg, ASTM D1238) | 25 g/10 min |
Q1: What are the key mechanical advantages of Hytrel 4556 compared to other TPEEs or thermoplastic elastomers?
A: Hytrel 4556 offers an excellent balance of high tensile strength, outstanding flex fatigue resistance, and superior resilience—especially at elevated temperatures. Its unique polyester-ether architecture provides better retention of mechanical properties under dynamic loading and thermal cycling than many standard TPEEs or TPU-based materials.
Q2: Is Hytrel 4556 suitable for applications requiring repeated flexing or cyclic deformation?
A: Yes—Hytrel 4556 is specifically engineered for demanding dynamic applications such as bellows, couplings, and flexible shaft guards. Its exceptional flex life and low hysteresis minimize heat buildup during continuous bending, making it a preferred choice where long-term dimensional stability and fatigue resistance are critical.
Q3: How does Hytrel 4556 perform in contact with common automotive fluids and industrial lubricants?
A: Hytrel 4556 exhibits good resistance to a broad range of automotive fluids—including engine oils, transmission fluids, and brake fluids—as well as many greases and aliphatic hydrocarbons. Performance may vary depending on temperature, exposure duration, and fluid composition; testing under actual service conditions is recommended for critical applications.
Q4: Can Hytrel 4556 be processed using standard thermoplastic equipment?
A: Yes—it is fully compatible with conventional thermoplastic processing methods including injection molding, extrusion, and blow molding. Optimal results require careful control of melt temperature, residence time, and drying (recommended moisture content < 50 ppm prior to processing) to preserve its thermomechanical performance.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
