Jun 27，2025 by Dawn Group
How to Choose the Right TPE for Your Project
How to Choose the Right Thermoplastic Elastomer (TPE) for Your Project
Thermoplastic elastomers combine the elasticity of rubber with the processability of thermoplastics. Their applications range from automotive seals to medical devices and consumer electronics, and choosing the right TPE is critical to performance, durability and cost-effectiveness.
Advantages of TPE over Traditional Materials
✔ Easier to process – Can be injection molded, extruded or blow molded like thermoplastics.
✔ Recyclable – Unlike vulcanized rubber, TPE can be reprocessed.
✔ Design flexibility – Available in a variety of hardnesses, colors and textures.
✔ Cost-effective – TPEs have faster molding cycles and use less energy than thermoset rubbers.
Key Factors to Consider When Choosing a TPE
Mechanical Properties
The mechanical performance of a TPE determines its suitability for different applications.
| Property | Why It Matters | Testing Standard |
|---|---|---|
| Hardness (Shore A/D) | Determines softness/firmness | ASTM D2240 |
| Tensile Strength | Resistance to stretching | ASTM D412 |
| Elongation at Break | Flexibility before breaking | ASTM D412 |
| Compression Set | Recovery after deformation | ASTM D395 |
| Tear Resistance | Durability against cuts | ASTM D624 |
Chemical & Environmental Resistance
TPEs must be able to withstand oils, UV radiation and extreme temperatures.
Chemical resistance: TPVs (thermoplastic vulcanizates) have good resistance to oils, while SEBS-based TPEs are resistant to water and cleaning agents.
UV stability: TPEs with added UV stabilizers are essential for outdoor applications.
Temperature range:
Standard TPEs: -40°C to 120°C
High-performance TPVs: up to 150°C
Processing Method & Compatibility
| Process | Best TPE Types | Key Considerations |
|---|---|---|
| Injection Molding | TPE-S, TPE-O | Fast cycle times, complex shapes |
| Extrusion | TPE-V, TPU | Continuous profiles (tubes, seals) |
| Overmolding | TPE-S, TPU | Adhesion to PP, ABS, PC |
Regulatory & Industry-Specific Requirements
FDA compliance: Food contact materials (e.g. kitchenware) require FDA compliance.
Medical-grade TPE: Biocompatibility must meet USP Class VI or ISO 10993 standards.
Automotive standards: Flame retardancy (UL94) and low VOC emissions.
Conclusion & Final Recommendations
Selecting the right TPE involves:
- Clarifying mechanical and environmental requirements
- Selecting the best TPE chemistry (TPE-S, TPV, TPU, etc.)
- Ensuring compatibility with the manufacturing process
- Verifying compliance
Need help selecting a TPE? Contact us now for technical support.