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Excellent balance of high-temperature resistance and low-temperature flexibility
Outstanding fatigue resistance and long-term dynamic performance
Good chemical resistance to oils, greases, and many automotive fluids
High melt strength and excellent processability in injection molding and extrusion
Retains mechanical properties after repeated flexing and cyclic loading
Automotive air ducts and bellows
Powertrain components including CVJ boots and couplings
Industrial hoses and fluid handling systems
Consumer appliance parts requiring durability and thermal stability
Medical tubing and connectors demanding biocompatibility support (ISO 10993-tested variants)
| Chemical Type | Thermoplastic polyester elastomer (TPEE) |
| Product Form | Pellets |
| Appearance | Off-white to light tan, free-flowing pellets |
| Primary Applications | Dynamic structural components requiring thermal and mechanical resilience |
| Key Features | High hardness (Shore D 82), crystallinity-driven recovery, hydrolysis resistance |
| Benefits | Extended service life under cyclic stress; reduced part count vs. multi-material assemblies |
| Processing Method | Injection molding, extrusion, blow molding |
| Standards Compliance | RoHS compliant; UL recognition available (UL 94 HB) |
Q1: What are the key mechanical advantages of Hytrel 8238 compared to other TPEEs or thermoplastic elastomers?
A: Hytrel 8238 offers an exceptional balance of high tensile strength, excellent dynamic fatigue resistance, and outstanding recovery after repeated flexing—making it especially suitable for demanding cyclic applications such as automotive bellows, powertrain components, and industrial hoses where long-term dimensional stability under stress is critical.
Q2: Is Hytrel 8238 suitable for applications requiring exposure to oils, fuels, or common automotive fluids?
A: Yes—Hytrel 8238 exhibits superior resistance to a broad range of hydrocarbons, including mineral oils, synthetic lubricants, and many gasoline/diesel blends. Its polyester-based chemistry provides significantly better fluid resistance than many styrenic or olefinic TPEs, though performance should always be verified under actual service conditions and temperature profiles.
Q3: How does processing Hytrel 8238 differ from standard polyesters like PET or PBT?
A: While Hytrel 8238 shares some thermal processing similarities with rigid polyesters, its thermoplastic elastomeric nature allows lower melt temperatures and shorter cycle times. It processes well via injection molding and extrusion without requiring drying beyond standard hygroscopic guidelines—though consistent moisture control remains essential to maintain mechanical integrity and surface quality.
Q4: Can Hytrel 8238 be overmolded onto other engineering plastics or metals?
A: Yes—Hytrel 8238 is widely used in two-shot and insert molding processes, particularly over substrates like PBT, PA66, and aluminum. Good adhesion depends on proper mold design, thermal compatibility during bonding, and surface preparation; bond strength can be further enhanced using compatible primers or plasma treatment where required.
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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
