SEBS, SBS, TPO, TPV and TPC are different thermoplastic elastomer families with different temperature, weathering, compression, processing and cost profiles. The right choice begins with service conditions and component function; the family name only narrows the search to exact grades.
Family-level comparison
| Family | What it is | Typical selection strengths | Limits to verify |
|---|---|---|---|
| SBS (TPS) | Styrene-butadiene-styrene block copolymer compound | Soft feel, processing economy and broad formulation flexibility | Heat, oxidation, UV/weathering and long-term compression |
| SEBS (TPS) | Hydrogenated styrenic block copolymer compound | Weathering/aging improvement over many SBS systems, color and soft grades | Oil migration, heat, compression set and grade-specific chemical resistance |
| TPO | Thermoplastic polyolefin blend, generally uncrosslinked | Low density, chemical resistance and larger molded components | Elastic recovery, scratch, low-temperature impact and surface feel |
| TPV | Dynamically vulcanized rubber phase dispersed in a thermoplastic matrix | Seals, weathering and compression performance in suitable grades | Surface finish, hardness range, bond and exact temperature/chemical limits |
| TPC | Thermoplastic copolyester elastomer | Flex fatigue, engineering performance and higher-temperature uses | Hydrolysis, cost, hardness and moisture/processing requirements |
TPU is another major TPE family but is not interchangeable with TPC. It is covered separately because polyurethane chemistry, hydrolysis behavior and abrasion performance require their own grade-level review.
Use a requirements matrix, not a “best TPE” ranking
Score candidate grades against the actual project:
- continuous and peak temperature;
- outdoor UV, ozone, humidity and freeze–thaw;
- oil, fuel, cleaner, sweat or food exposure;
- hardness, compression set, tear, abrasion and flex fatigue;
- overmold substrate and required bond test;
- appearance, color, gloss and surface friction;
- regulatory documentation for the intended market; and
- available molding process, cycle and cost.
Examples of how the decision changes
Outdoor seal: weathering, compression set, temperature and fluid exposure may move the shortlist toward an exterior TPV or another validated grade. Soft indoor grip: a substrate-specific SEBS compound may offer color and haptics. Repeated-flex engineering boot: a TPC or TPU candidate may deserve testing. These are screening examples, not grade recommendations.
Overmolding makes grade selection more specific
A generic SEBS or TPV may bond to PP yet separate cleanly from PC or PA. Specialty compounds use adhesion modification for named substrate families. Confirm the complete substrate and TPE grades, then test a representative interface after conditioning. Mechanical retention is valuable when peeling could create a safety or sealing failure.
Processing and tool implications
- Very soft grades may need larger gates, generous radii, careful ejection and supported edges.
- Hygroscopic grades require supplier-specified drying; moisture can affect both appearance and properties.
- Different families have different melt windows and residence-time sensitivity.
- Shrinkage and part release depend on the compound, geometry and process—not only the family.
- Color concentrate carrier and regrind can affect adhesion and performance.
Evidence to obtain before material approval
- Current grade-specific technical and safety data sheets
- Conditioned property data relevant to the exposure
- Overmold compatibility and test method where applicable
- Regulatory declarations tied to grade, color and use
- Processing, drying and regrind limits
- Change-notification and supply information
- Results from production-representative molded samples
CKMOLD can help translate the requirements into a moldable part and test plan through plastic material support, DFM analysis and overmolding services. Send the CAD, substrate, exposure and acceptance criteria through request a quote.