描述
Santoprene 121-67W175 is a soft, black, UV-resistant thermoplastic vulcanizate (TPV) from Celanese developed for thin-wall and complex profile extrusion applications.
This grade combines the rubber-like flexibility of a dynamically vulcanized elastomer with the processability of a thermoplastic. Celanese describes the material as polyolefin based, shear dependent and recyclable within the manufacturing stream.
The key difference between Santoprene 121-67W175 and a conventional general-purpose TPV is its profile-extrusion tuning. Celanese specifically states that the grade is designed to produce thin-wall sections with excellent definition down to approximately 0.33 mm radius while helping maximize extrusion run length with minimal material build-up on screen packs or narrow sections of the die.
This makes the grade particularly attractive for demanding sealing profiles where small radii, thin lips, complex geometry and long production runs must be controlled consistently.
The material is also designed for improved UV resistance. Combined with excellent ozone resistance, this makes Santoprene 121-67W175 relevant to exterior and weather-exposed seals, profiles and glazing systems.
Celanese’s current TPV Product Finder places the grade in the UV black TPV family and describes it as a general-purpose extrusion and molding material with UV stability and profile-extrusion performance tuning.
The current Shore A hardness is approximately 72, placing the grade in a medium-firm elastomer range. It is firmer than Santoprene 121-58W175 but remains highly flexible.
Current grade data lists approximately 432% elongation at break, 6.83 MPa stress at break, 2.89 MPa tensile stress at 100% elongation and approximately 24 kN/m tear strength.
Low-temperature flexibility is another important advantage. The current brittleness temperature is approximately -59°C, which supports use in cold climates and outdoor service.
Compression-set values are approximately 29% at 70°C for 24 hours and 43% at 125°C for 70 hours. Current Celanese material data also lists a continuous upper temperature resistance of 135°C for 1,000 hours under SAE J2236.
A particularly strong application for Santoprene 121-67W175 is building and construction glazing seals. Celanese has specifically used this grade in its Santoprene TPV glazing-seal solution literature, highlighting profile tolerance, weathering behavior and manufacturing advantages compared with traditional thermoset rubber solutions.
For more TPV products, visit our TPV Thermoplastic Vulcanizates Product Category →.
For the current Celanese grade portfolio, see the Official Celanese Santoprene & Geolast TPV Product Finder →.
Key Features of Santoprene 121-67W175
| Feature | Engineering Benefit |
|---|---|
| Shore A 72 | Balanced firmness and flexibility for technical sealing profiles |
| Improved UV Resistance | Supports exterior and weather-exposed components |
| Excellent Ozone Resistance | Helps resist atmospheric cracking and aging |
| Excellent Flex-Fatigue Resistance | Useful for profiles and seals undergoing repeated movement |
| 432% Elongation at Break | Allows substantial deformation while maintaining elastomeric behavior |
| 6.83 MPa Stress at Break | Provides useful strength for flexible sealing sections |
| 24 kN/m Tear Strength | Supports durability at thin lips, edges and profile transitions |
| -59°C Brittleness Temperature | Strong low-temperature flexibility |
| Thin-Wall Extrusion Design | Optimized for fine sections and complex profile geometry |
| 0.33 mm Radius Definition | Supports excellent definition in small extrusion features |
| Reduced Die / Screen Build-Up | Helps extend extrusion run length |
| Shear-Dependent Flow | Flow improves with increasing shear rate |
| Polyolefin-Based TPV | Low density and thermoplastic processing benefits |
| Manufacturing-Stream Recyclability | Controlled process scrap may be reprocessed where specification permits |
Typical Applications for Santoprene 121-67W175
Santoprene 121-67W175 is particularly suited to continuous profiles and sealing systems.
| Application Area | Typical Use |
|---|---|
| Glazing Seals | Building and construction window or facade sealing profiles |
| Weather Seals | Exterior sealing systems exposed to sunlight and ozone |
| Automotive Exterior Profiles | Flexible exterior seals and weather-exposed profile components |
| Thin-Wall Sealing Lips | Fine flexible lips requiring good extrusion definition |
| Complex Extruded Profiles | Multi-feature sealing profiles with narrow die sections |
| Industrial Seals | Continuous seals requiring UV and ozone resistance |
| Profile Gaskets | Flexible extruded gasket sections |
| Thermoformed Components | Shaped TPV components made from suitable sheet or profile forms |
| Vacuum-Formed Components | Flexible formed parts where grade characteristics are appropriate |
| Outdoor Consumer Components | Flexible parts exposed to sunlight and weather |
Typical Properties of Santoprene 121-67W175
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 970 kg/m³ / 0.970 g/cm³ | ISO 1183 |
| Shore A Hardness, 15 s | 72 | ISO 48-4 / ISO 868 |
| Resin Identification | TPV | ISO 1043 |
| Part Marking Code | >TPV< | ISO 11469 |
| Color | Black | Manufacturer information |
| Product Form | Pellets | Manufacturer information |
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile Stress at 100% Elongation, Perpendicular | 2.89 MPa | ISO 37 |
| Stress at Break, Perpendicular | 6.83 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break, Perpendicular | 432% | ISO 527-1/-2 or ISO 37 |
| Tear Strength, Normal | 24 kN/m | ISO 34-1 |
| Brittleness Temperature | -59°C | ASTM D746 |
| Compression Set, 70°C / 24 h | 29% | ISO 815 |
| Compression Set, 125°C / 70 h | 43% | ISO 815 |
Thermal & Electrical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Continuous Upper Temperature Resistance, 1000 h | 135°C | SAE J2236 |
| Relative Permittivity @ 60 Hz | 2.6 | IEC 62631-2-1 |
| Electric Strength, Short Time, 2 mm | 26 kV/mm | ASTM D149 |
Why Choose Santoprene 121-67W175?
The main reason to choose Santoprene 121-67W175 is its extrusion-specific design.
Many TPV grades can be extruded, but complex sealing profiles create more demanding conditions than simple tubes or strips. A profile die may contain thin flexible lips, narrow flow channels, small radii, multiple wall thicknesses and tight dimensional tolerances.
Celanese specifically designed Santoprene 121-67W175 for this type of production. The material can reproduce sections down to approximately 0.33 mm radius, making it useful for detailed profile geometry.
Celanese also highlights reduced material build-up on screen packs and narrow die sections. This is important because build-up can gradually alter melt pressure, surface quality and profile dimensions during long extrusion runs.
Improved UV resistance gives the grade another advantage over standard black general-purpose TPV grades. For glazing seals, automotive exterior profiles and outdoor industrial seals, sunlight exposure can be a critical design factor. Ozone exposure can also cause cracking in less resistant elastomer systems.
The Shore A 72 hardness provides a useful balance. It is soft enough for sealing but firm enough to maintain the geometry of thin-wall extruded sections.
The 432% elongation provides substantial flexibility, while the 24 kN/m tear strength supports thin lips and profile edges.
For continuous profile manufacturers, this combination can be more valuable than simply selecting a grade based on Shore hardness alone.
Processing Guidelines for Santoprene 121-67W175
The current Celanese grade data identifies extrusion, thermoforming and vacuum forming as suitable processing routes for Santoprene 121-67W175. Celanese’s Product Finder also places the grade in its extrusion-and-molding UV black TPV family.
Extrusion Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying Temperature | 82°C |
| Drying Time | 3 hours in a dehumidified dryer |
| Melt Temperature Range | 177–204°C |
| General Santoprene TPV Processing Window | 175–230°C |
| Maximum Drawdown | 15% |
Celanese recommends desiccant drying for approximately 3 hours at 80–82°C.
The grade-specific extrusion melt-temperature range is approximately 177–204°C. Although the broader Santoprene family can be processed over approximately 175–230°C, the grade-specific range is the better starting point for extrusion trials.
Drawdown Control
Celanese specifically states that drawdown should not exceed approximately 15%.
This is important for thin-wall and precision profiles. Excessive drawdown can change wall thickness, sealing-lip geometry and final dimensional accuracy.
Shear-Dependent Flow
Santoprene 121-67W175 is shear dependent. As shear rate increases, apparent melt viscosity decreases.
Processors should therefore optimize screw design, screw speed, screen-pack pressure, die-channel dimensions, melt temperature, output rate, haul-off speed and cooling conditions together rather than relying on temperature alone.
Profile Extrusion Optimization
For complex profiles, monitor:
- Extrusion pressure
- Die swell
- Surface finish
- Profile dimensions
- Wall-thickness uniformity
- Lip definition
- Screen-pack build-up
- Die build-up
- Cooling rate
- Haul-off stability
Material Compatibility
Celanese states that Santoprene TPV is incompatible with acetal (POM) and PVC.
Extrusion equipment should be properly purged when changing between these materials and Santoprene 121-67W175.
Santoprene 121-67W175 vs. Santoprene 121-58W175
Both grades belong to Celanese’s UV black W175 profile-extrusion family, but they provide different hardness and strength levels.
| Feature | Santoprene 121-67W175 | Santoprene 121-58W175 |
|---|---|---|
| Material Family | TPV | TPV |
| Color | Black | Black |
| UV Stabilized | Yes | Yes |
| Profile Extrusion Tuned | Yes | Yes |
| Shore A Hardness | 72 | 61 |
| Elongation at Break | 432% | 460% |
| Tensile Stress at Break | 6.8 MPa | 5.1 MPa |
| Tensile Stress @ 100% Elongation | 2.9 MPa | 2.0 MPa |
| Compression Set @ 70°C | 29% | 27% |
| Main Selection Difference | Firmer, stronger profile grade | Softer, more compliant profile grade |
Choose Santoprene 121-67W175 when the profile needs greater hardness, tensile strength and geometric support.
Choose Santoprene 121-58W175 when softer sealing behavior and greater compliance are more important.
Related Products
Santoprene 121-58W175 – Softer black UV-resistant profile-extrusion TPV with approximately Shore A 61 hardness.
Santoprene 121-73W175 – Firmer black UV-resistant profile-extrusion TPV with approximately Shore A 78 hardness.
Santoprene 121-80W175 – Higher-hardness black UV-resistant TPV for profile extrusion and applications requiring greater support.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 121-67W175
| Document Type | Description |
|---|---|
| TDS | Celanese mechanical, thermal, electrical and extrusion-processing data |
| SDS | Safety Data Sheet |
| Santoprene Product Finder | Current Celanese grade-family positioning and comparison |
| Processing Information | Extrusion and TPV processing guidance |
| Building & Construction Literature | Glazing-seal application information |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 121-67W175
Q1: What is Santoprene 121-67W175?
Santoprene 121-67W175 is a black UV-resistant TPV from Celanese designed for thin-wall and complex profile extrusion, with approximately Shore A 72 hardness.
Q2: What is the hardness of Santoprene 121-67W175?
The current Celanese grade data lists approximately Shore A 72 after 15 seconds.
Q3: Is Santoprene 121-67W175 UV resistant?
Yes. Celanese specifically describes the grade as UV resistant and designed for improved UV resistance.
Q4: Is Santoprene 121-67W175 suitable for outdoor seals?
Yes. Its improved UV resistance and excellent ozone resistance make it well suited to weather-exposed profile and sealing applications.
Q5: What is the elongation at break?
Current Celanese data lists approximately 432% elongation at break.
Q6: What is the tensile strength?
The current stress at break is approximately 6.83 MPa, with approximately 2.89 MPa tensile stress at 100% elongation.
Q7: How thin can the extrusion geometry be?
Celanese states that the grade is designed to extrude thin-wall sections with excellent definition down to approximately 0.33 mm radius.
Q8: What extrusion melt temperature should be used?
The current grade-specific melt-temperature range is approximately 177–204°C.
Q9: Does Santoprene 121-67W175 need drying?
Yes. Celanese recommends desiccant drying at approximately 80–82°C for 3 hours before processing.
Q10: What is the difference between Santoprene 121-67W175 and 121-58W175?
Both are black UV-stabilized W175 profile-extrusion grades. 121-67W175 is firmer at Shore A 72 and provides higher tensile strength, while 121-58W175 is softer at approximately Shore A 61.
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