描述
Santoprene 121-73W175 is a soft, black, UV-resistant thermoplastic vulcanizate (TPV) from Celanese designed especially for thin-wall and complex profile extrusion.
This grade belongs to the Santoprene 121-series UV-black TPV family. In Celanese’s current product finder, Santoprene 121-73W175 is positioned as a general-purpose extrusion and molding grade with UV stability and performance specifically tuned for profile extrusion.
The material combines rubber-like flexibility and elastic recovery with the processing advantages of a thermoplastic. It is polyolefin based and can be processed on conventional thermoplastic equipment.
The most important difference between Santoprene 121-73W175 and a standard general-purpose TPV is its profile-extrusion optimization.
Celanese states that the grade is designed for extrusion of thin-wall sections with excellent definition, including geometry down to approximately 0.33 mm radius. It is also engineered to maximize production run length while minimizing material build-up on screen packs and narrow sections of extrusion dies.
This makes Santoprene 121-73W175 highly relevant to continuous automotive sealing profiles, weatherstrips, glass-run-channel components, complex sealing lips and other extruded profiles where dimensional definition and stable production are critical.
The material has a Shore A hardness of approximately 78, providing a relatively firm elastomeric response while maintaining very high elongation.
Current Celanese grade data lists approximately 460% elongation at break, 8.69 MPa stress at break and 3.76 MPa stress at 100% elongation.
The grade also offers approximately 27 kN/m tear strength, helping thin lips and complex profile sections resist tearing during processing, assembly and service.
Low-temperature performance is strong, with a brittleness temperature of approximately -60°C under both ASTM D746 and ISO 812-related testing.
For seals and profiles exposed to long-term compression, current Celanese data lists approximately 34% compression set at 70°C for 24 hours and 42% at 125°C for 70 hours.
Environmental resistance is a major part of the grade’s positioning. Celanese specifically describes excellent ozone resistance, excellent flex-fatigue resistance and improved UV resistance.
These characteristics are especially important in automotive exterior sealing, window and door profiles and weather-exposed elastomer components.
Santoprene 121-73W175 is UL recognized under Celanese file references QMFZ2.E80017 and QMFZ8.E80017. Current grade data lists UL 94 HB at 3.0 mm.
The material also has an electric strength of approximately 27 kV/mm at 2 mm, giving additional technical context for protective or electrically adjacent elastomeric components.
For more TPV products, visit our TPV Thermoplastic Vulcanizates Product Category →.
For the broader Celanese Santoprene portfolio, see the Official Celanese Santoprene & Geolast TPV Product Finder →.
Key Features of Santoprene 121-73W175
| Feature | Engineering Benefit |
|---|---|
| Shore A 78 | Firmer elastomeric response for automotive sealing and profile applications |
| UV Resistant | Designed for improved durability in sunlight and exterior service |
| Excellent Ozone Resistance | Helps prevent cracking in weather-exposed applications |
| Excellent Flex-Fatigue Resistance | Supports repeated movement and dynamic sealing |
| Thin-Wall Profile Capability | Designed for fine profile definition down to approximately 0.33 mm radius |
| Reduced Extrusion Build-Up | Supports longer runs with minimal material accumulation in narrow die sections |
| 460% Elongation at Break | High flexibility despite 78A hardness |
| 8.69 MPa Stress at Break | Strong mechanical performance for a flexible TPV |
| 27 kN/m Tear Strength | Useful for thin lips, profile edges and sealing details |
| -60°C Brittleness Temperature | Supports cold-weather automotive applications |
| UL Recognized | Current Celanese documentation references E80017 |
| Thermoplastic Processing | Compatible with conventional extrusion, thermoforming and vacuum-forming equipment |
| Polyolefin Based | Low density and manufacturing-stream recyclability |
| Automotive OEM References | Current grade data lists multiple global automotive specifications |
Typical Applications for Santoprene 121-73W175
Santoprene 121-73W175 is particularly suited to complex and thin-section extruded components.
| Application Area | Typical Use |
|---|---|
| Automotive Weatherseals | Exterior sealing profiles exposed to sunlight, ozone and temperature cycles |
| Glass Run Channels | Flexible profile sections around automotive side glass |
| Door Sealing Profiles | Complex extruded sealing geometries |
| Window Profiles | Flexible UV-resistant sealing lips |
| Automotive Exterior Trim | Elastomeric profile and sealing components |
| Automotive Interior Profiles | Flexible trim and sealing sections |
| Under-Hood Profiles | Flexible technical profiles with heat and ozone exposure |
| Thin-Wall Extrusions | Fine-section profiles requiring precise definition |
| Complex Coextruded Profiles | Soft TPV sealing section combined with compatible substrates |
| Electrical Protective Profiles | Flexible UV-resistant protective components |
| Industrial Seals | Continuous profiles requiring weatherability and flexibility |
Celanese has also used Santoprene 121-73W175 as a benchmark material for glass run channel lip and foot applications, reinforcing its relevance to demanding automotive profile extrusion.
Typical Properties of Santoprene 121-73W175
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 970 kg/m³ / 0.970 g/cm³ | ISO 1183 |
| Shore A Hardness, 15 s | 78 | ISO 48-4 / ISO 868 |
| Color | Black | Manufacturer information |
| Product Form | Pellets | Manufacturer information |
| Base Chemistry | Polyolefin-based TPV | Manufacturer information |
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Stress at 100% Elongation | 3.76 MPa | ISO 527-1/-2 or ISO 37 |
| Stress at Break | 8.69 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break | 460% | ISO 527-1/-2 or ISO 37 |
| Tear Strength, Normal | 27 kN/m | ISO 34-1 |
| Brittleness Temperature | -60°C | ASTM D746 |
| Low-Temperature Brittleness | -60°C | ISO 812 |
| Compression Set, 70°C / 24 h | 34% | ISO 815 |
| Compression Set, 125°C / 70 h | 42% | ISO 815 |
Aging Performance
| Property | Typical Change | Test Condition |
|---|---|---|
| Tensile Strength Change | -9% | 150°C / 168 h |
| Elongation Change | -2% | 150°C / 168 h |
| Shore A Hardness Change | +5 | 150°C / 168 h |
| Continuous Upper Temperature Resistance | 135°C | SAE J2236, 1008 h |
Flammability & Electrical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| UL 94 Rating @ 3.0 mm | HB | UL 94 |
| UL Recognition | Yes | UL 94 |
| Electric Strength, 2 mm | 27 kV/mm | ASTM D149 |
Why Choose Santoprene 121-73W175?
The main reason to choose Santoprene 121-73W175 is the combination of profile-extrusion stability, UV resistance and elastomeric durability.
Extruding a complex automotive weatherseal is more demanding than molding a simple gasket. Thin sealing lips and narrow die sections can make melt stability, die build-up and edge definition critical to production efficiency.
Celanese specifically designed Santoprene 121-73W175 to address these challenges.
The grade can produce thin sections with fine definition, including geometry down to approximately 0.33 mm radius.
At the same time, it is intended to reduce material accumulation on screen packs and narrow die sections. This can support longer production runs and reduce interruptions for die cleaning.
The grade’s UV stabilization is another major advantage over standard black TPV grades that are not specifically optimized for outdoor profile exposure.
Excellent ozone resistance supports weatherseals and exterior components that may remain exposed to air, sunlight and fluctuating temperatures over many years.
Flex-fatigue resistance is important for door seals, glass-run-channel lips and dynamic sealing elements that bend every time a vehicle door or window operates.
The 460% elongation at break provides substantial deformation capability.
The 27 kN/m tear strength supports durability in thin edges and sealing lips.
For automotive profile manufacturers needing a black 78A TPV specifically tuned for thin-wall extrusion and long production runs, Santoprene 121-73W175 is more targeted than a basic general-purpose TPV.
Processing Guidelines for Santoprene 121-73W175
Santoprene 121-73W175 is primarily designed for extrusion and can also be processed by:
- Profile extrusion
- Coextrusion
- Sheet extrusion
- Thermoforming
- Vacuum forming
- Conventional thermoplastic extrusion equipment
Grade-Specific Extrusion Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying Temperature | 82°C |
| Drying Time | 3 hours |
| Dryer Type | Dehumidified / desiccant dryer |
| Melt Temperature Range | 177–204°C |
| General Santoprene Processing Window | 175–230°C |
| Maximum Drawdown | 15% |
Celanese recommends drying for approximately 3 hours at 80–82°C before processing.
For this grade, the published extrusion melt-temperature range is approximately 177–204°C.
The broader Santoprene family can be processed across approximately 175–230°C, but the grade-specific range should be the preferred starting point for production trials.
Drawdown Control
Celanese specifically states that drawdown should not exceed approximately 15%.
This is particularly important for thin-wall and complex extrusion profiles because excessive drawdown can change dimensions, wall thickness, lip geometry and surface quality.
Shear-Dependent Flow
Santoprene 121-73W175 is a shear-dependent TPV. As shear rate increases, apparent melt viscosity decreases.
Processors should optimize screw speed, melt temperature, screen-pack configuration, die pressure, die geometry, drawdown, cooling rate, haul-off speed and coextrusion balance.
Material Compatibility
Celanese states that Santoprene TPV is incompatible with acetal (POM) and PVC.
Extrusion lines should be properly purged when changing between these materials and Santoprene TPV.
Automotive OEM References for Santoprene 121-73W175
Current Celanese grade data lists numerous automotive references:
| OEM / Organization | Specification / Reference |
|---|---|
| Ford | WSS-M2D280-B1 |
| Ford | WSS-M9P14-A1 / MCDCC JA6A |
| General Motors | GMW15812 Type 6E |
| Mercedes-Benz Group | DBL 5562 |
| Hyundai | MS220-05 Type P |
| MAN | M3236 A7 |
| Iveco | IVECO 15-5244 EMP-70 |
| Renault | FRM 18-27-039 / –C |
| Stellantis / FCA | 55248/02 EMP-70 |
| Stellantis / Chrysler | MS-AR-100 CGV |
| Volkswagen Group | TL 526 41C |
| Volkswagen Group | TL 527 03 |
| Volkswagen Group | VW50123 |
| BAIC | BAS-492 |
| Geely | Q/JLY J7110166B |
| SAIC Motor | SMTC 5 320 024 |
| Li Auto | Q/LiA5310057 |
| Bosch | N28 BN34-OX 017 |
Santoprene 121-73W175 vs. Santoprene 121-67W175
| Feature | Santoprene 121-73W175 | Santoprene 121-67W175 |
|---|---|---|
| Material Family | TPV | TPV |
| Color | Black | Black |
| Main Positioning | UV profile extrusion | UV profile extrusion |
| Shore A Hardness | 78 | 72 |
| Elongation at Break | 460% | 432% |
| Tensile Stress at Break | 8.7 MPa | 6.8 MPa |
| Stress @ 100% Elongation | 3.8 MPa | 2.9 MPa |
| Compression Set, 70°C | 34% | 29% |
| UV Stability | Yes | Yes |
| Profile Extrusion Tuning | Yes | Yes |
| Main Selection Difference | Firmer, stronger profile | Softer, more compliant profile |
Choose Santoprene 121-73W175 when greater hardness and tensile strength are required in a UV-resistant extrusion profile.
Choose Santoprene 121-67W175 when the design requires a softer and more compliant profile.
Related Products
Santoprene 121-67W175 – Softer UV-resistant black TPV tuned for profile extrusion, approximately Shore A 72.
Santoprene 121-58W175 – Softer profile-extrusion TPV with approximately Shore A 61 hardness.
Santoprene 121-80W175 – Firmer UV-stabilized W175 profile-extrusion grade with approximately Shore A 85 hardness.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 121-73W175
| Document Type | Description |
|---|---|
| TDS | Current Celanese physical, mechanical and extrusion data |
| SDS | Safety Data Sheet |
| UL Information | QMFZ2.E80017 / QMFZ8.E80017 recognition |
| Automotive Specification Information | Ford, GM, Mercedes-Benz, Hyundai, VW and other OEM references |
| Santoprene Product Finder | Current Celanese grade comparison and application positioning |
| Processing Guide | Extrusion and profile-processing guidance |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 121-73W175
Q1: What is Santoprene 121-73W175?
Santoprene 121-73W175 is a black UV-resistant TPV from Celanese designed for thin-wall and complex profile extrusion.
Q2: What is the hardness of Santoprene 121-73W175?
The current Shore A hardness is approximately 78.
Q3: What is the tensile stress at break?
Current Celanese grade data lists approximately 8.69 MPa.
Q4: What is the elongation at break?
The current elongation at break is approximately 460%.
Q5: Is Santoprene 121-73W175 UV resistant?
Yes. Celanese specifically describes the grade as designed for improved UV resistance and includes it in the UV-black TPV family.
Q6: Is Santoprene 121-73W175 suitable for thin-wall profile extrusion?
Yes. Celanese specifically designed the grade for thin-wall and complex profiles, including fine geometry down to approximately 0.33 mm radius.
Q7: What is the low-temperature performance?
The current brittleness temperature is approximately -60°C.
Q8: What extrusion temperature is recommended?
The grade-specific published melt-temperature range is approximately 177–204°C.
Q9: What is the maximum recommended drawdown?
Celanese states that drawdown should not exceed approximately 15%.
Q10: What is the difference between Santoprene 121-73W175 and 121-67W175?
Both are UV-resistant black W175 grades tuned for profile extrusion. 121-73W175 is harder at Shore A 78 and has higher tensile strength, while 121-67W175 is softer at approximately Shore A 72.
Request Santoprene 121-73W175 Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 121-73W175, please provide:
- Required quantity
- Destination country or port
- Automotive or industrial application
- Weatherseal, glass-run-channel or other profile design
- Required Shore hardness
- Profile wall thickness
- Minimum lip or corner radius
- UV and outdoor exposure
- Service temperature range
- Compression-set requirement
- Extrusion line and screw configuration
- Coextrusion requirement
- OEM specification requirement
- TDS, SDS, UL or COA requirement
- Sample requirement, if applicable
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