描述
Santoprene 121-80B260 is a hard black thermoplastic vulcanizate (TPV) from Celanese developed specifically for automotive weatherseal corner molding and end-cap applications.
The grade combines three functions that are especially important in automotive glass-run channels and dense weatherseal systems: low coefficient of friction, adhesion to TPV and vulcanized EPDM, and high-flow injection molding behavior.
Celanese describes Santoprene 121-80B260 as a material designed for complex hard corner molding and end caps used with dense extruded automotive weatherseals made from either TPV or EPDM rubber.
This makes the grade different from a general-purpose Santoprene material. It is not selected simply because of its hardness. Its formulation is targeted toward joining, overmolding and finishing weatherseal assemblies where molded corner sections must bond effectively to an extruded profile.
One of the most important design features is its built-in low coefficient of friction. In glass-run channel and weatherseal systems, friction can influence window movement, noise, wear and long-term appearance. A dedicated low-friction compound can reduce dependence on secondary coatings or post-treatment in suitable designs.
Celanese also states that the low-friction behavior does not significantly change after heat aging and that the material avoids surface bleeding. These characteristics are useful where an automotive weatherseal must retain a consistent surface appearance and sliding behavior over time.
Another major benefit is adhesion. Santoprene 121-80B260 is formulated to adhere to both TPV and vulcanized EPDM rubber. This gives processors flexibility when producing corner-molded assemblies from different extruded weatherseal substrates.
The grade is particularly relevant for GRC – glass run channel – corner molding, where molded corner sections join long extruded sealing profiles.
The material’s high shear-thinning behavior is another key technical advantage. At low shear rates, Santoprene TPV has relatively high melt viscosity. As shear rate increases, apparent viscosity falls significantly.
For complex corner geometries, small gates and narrow flow paths, this shear-thinning behavior helps the melt fill difficult features while maintaining the surface quality required by automotive exterior and weatherseal applications.
Current Celanese grade data lists a Shore A hardness of approximately 78, tensile stress at break of approximately 11 MPa, tensile stress at 100% elongation of approximately 3.5 MPa, and elongation at break of approximately 640%.
This property combination provides flexibility while maintaining the strength required for hard corner sections and end caps.
The density is approximately 0.910 g/cm³, making this a relatively lightweight TPV compared with many conventional thermoset rubber compounds.
Santoprene 121-80B260 is also identified as UV stabilized or stable to weather, supporting use in vehicle sealing components exposed to exterior environmental conditions.
Celanese positions the material as a thermoplastic alternative to thermoset EPDM in selected automotive corner-molding applications. The manufacturer specifically highlights the potential for shorter processing cycle times compared with thermoset EPDM rubber, because normal thermoplastic molding does not require the same vulcanization process.
For more TPV products, visit our TPV Thermoplastic Vulcanizates Product Category →.
For the broader Santoprene portfolio, visit the Official Celanese Santoprene TPV Page →.
Key Features of Santoprene 121-80B260
| Feature | Engineering Benefit |
|---|---|
| Shore A 78 | Firm elastomeric response for automotive corner molding |
| Built-In Low COF | Supports smooth sliding surfaces and reduced friction |
| TPV Bonding | Suitable for corner molding onto TPV weatherseal profiles |
| EPDM Bonding | Adheres to vulcanized EPDM rubber |
| 640% Elongation at Break | High flexibility despite relatively high hardness |
| 11 MPa Stress at Break | Strong mechanical performance for molded corner sections |
| High Shear-Thinning Behavior | Good filling of complex geometries and narrow flow paths |
| Good Flowability | Supports complex injection-molded corners and end caps |
| Excellent Surface Aspect | Helps match the appearance of extruded weatherseal profiles |
| No Surface Bleeding | Helps maintain cleaner long-term surface appearance |
| Low-Friction Retention after Heat Aging | Supports consistent sliding behavior over time |
| UV / Weather Stability | Suitable for exposed automotive sealing applications |
| Thermoplastic Processing | Potentially shorter cycle time than thermoset EPDM molding |
| Injection Molding | Designed specifically for molded weatherseal junctions |
Typical Applications for Santoprene 121-80B260
| Application Area | Typical Use |
|---|---|
| Glass Run Channel Corner Molding | Molded hard corners joining automotive weatherseal profiles |
| Weatherseal End Caps | Injection-molded end sections on extruded seals |
| TPV Weatherseal Junctions | Molded joining sections on TPV extrusions |
| EPDM Weatherseal Junctions | Molded joining sections on vulcanized EPDM profiles |
| Automotive Window Seals | Low-friction areas around movable glass systems |
| Complex Corner Geometries | High-shear injection molding through narrow flow paths |
| Automotive Exterior Sealing | Weather-exposed sealing components |
| GRC Components | Glass run channel molded corners and junctions |
Typical Properties of Santoprene 121-80B260
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 910 kg/m³ / 0.910 g/cm³ | ISO 1183 |
| Shore A Hardness, 15 s | 78 | ISO 48-4 / ISO 868 |
| Resin Identification | TPV | ISO 1043 |
| Part Marking Code | >TPV< | ISO 11469 |
| Delivery Form | Pellets | Manufacturer information |
| Color | Black | Manufacturer information |
| Special Characteristic | UV stabilized / weather stable | Manufacturer information |
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile Stress at 100% Elongation, Perpendicular | 3.5 MPa | ISO 37 |
| Tensile Stress at Break, Perpendicular | 11 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break, Perpendicular | 640% | ISO 527-1/-2 or ISO 37 |
| Shore A Hardness | 78 | ISO 48-4 / ISO 868 |
| Compression Set, 70°C / 24 h | 62% | ISO 815 |
Bonding & Surface Performance
Celanese specifically identifies the following grade-level characteristics for Santoprene 121-80B260:
- Adhesion to vulcanized EPDM rubber
- Adhesion to TPV
- Built-in low coefficient of friction
- Good surface appearance
- Good color harmony with extruded profiles
- No surface bleeding
- Retention of low-friction behavior after heat aging
Why Choose Santoprene 121-80B260?
The main reason to select Santoprene 121-80B260 is that it integrates several functions into one injection-moldable TPV.
Traditional automotive weatherseal systems often use extruded EPDM profiles combined with separately molded corner sections. Thermoset EPDM corner molding can involve longer cycle times because the material requires vulcanization.
Celanese developed this grade as a thermoplastic alternative for selected hard-corner applications.
Because it is a TPV, the material can be injection molded with thermoplastic processing equipment.
This can simplify production and shorten cycle times compared with thermoset EPDM in suitable applications.
Bonding is another critical issue. A corner-molding compound is only useful if it can adhere reliably to the extruded profile.
Santoprene 121-80B260 is specifically formulated to bond to both vulcanized EPDM and TPV, giving processors flexibility across multiple weatherseal constructions.
Low friction is equally important in glass-run channel systems.
The glass must move through the channel without excessive drag. A material with built-in low COF can help maintain smoother window operation and reduce surface friction.
Celanese also emphasizes that the friction behavior remains stable after heat aging and that the surface does not bleed.
Surface aesthetics matter because weatherseal corners must visually match the surrounding extrusion. This grade is formulated to provide an excellent surface aspect and good color harmony with extruded profiles.
Finally, its high shear-thinning behavior supports the injection molding of complex geometries.
Small gates and intricate corner cavities create high shear rates. For Santoprene TPV, higher shear lowers apparent viscosity, improving melt flow into these features.
For manufacturers producing automotive weatherseal corners, end caps and glass-run channel junctions, Santoprene 121-80B260 is therefore a highly targeted material rather than a generic TPV.
Processing Guidelines for Santoprene 121-80B260
Santoprene 121-80B260 is designed for:
- Injection molding
- Multi-injection molding
Grade-Specific Injection Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying | Recommended |
| Drying Temperature | 65°C |
| Drying Time | ≥3 hours in a dehumidified dryer |
| Processing Moisture Content | ≤0.08% |
| Optimum Melt Temperature | 220°C |
| Minimum Melt Temperature | 210°C |
| Maximum Melt Temperature | 230°C |
| Optimum Mold Temperature | 50°C |
| Minimum Mold Temperature | 40°C |
| Maximum Mold Temperature | 60°C |
| Ejection Temperature | 90°C |
| Recommended Screw Speed | 100–200 rpm |
| Holding Pressure | Approx. 50–75% of actual injection pressure |
| Optional Back Pressure | Approx. 0.3–0.7 MPa |
The current grade-level datasheet lists 65°C drying for at least 3 hours.
Celanese’s broader Santoprene processing notes also mention 80°C for 3 hours as a general family recommendation. For Santoprene 121-80B260, the grade-specific drying instruction should be used as the primary starting point.
Shear-Dependent Flow
Santoprene TPV has relatively high viscosity at low shear. As shear increases, viscosity decreases.
This means:
- Smaller gates can raise shear and improve flow
- Higher screw speeds can improve melt homogeneity
- Injection speed strongly influences filling
- Increasing temperature alone has relatively limited impact on viscosity
- Gate and runner design are particularly important for complex corners
Material Compatibility
Celanese states that Santoprene TPV is incompatible with acetal (POM) and PVC.
Processors should thoroughly purge barrels, screws, hot runners and related equipment when switching between these materials and Santoprene 121-80B260.
Santoprene 121-80B260 vs. Santoprene 121-80B230
| Feature | Santoprene 121-80B260 | Santoprene 121-80B230 |
|---|---|---|
| Material Family | TPV | TPV |
| Color | Black | Black |
| Main Application | Hard corner molding & end caps | GRC corner molding, end caps & fixation |
| EPDM Bonding | Yes | Yes |
| TPV Bonding | Yes | Yes |
| Low-COF Positioning | Built-in low COF | Enhanced COF properties |
| Shore A Hardness | 78 | 80 |
| Tensile Stress @100% | 3.5 MPa | Approx. 3.3 MPa |
| Stress at Break | 11 MPa | Approx. 8.3 MPa |
| Elongation at Break | 640% | Approx. 540% |
| Compression Set, 70°C / 24 h | 62% | Approx. 50% |
| Density | 0.910 g/cm³ | Approx. 0.920 g/cm³ |
| Main Selection Difference | Higher break strength and elongation with built-in low-friction focus | Slightly harder bonding/COF corner-molding option |
Related Products
Santoprene 121-80B230 – Black TPV for bonding to sulfur- or peroxide-cured EPDM in automotive corner molding, end caps and fixation applications.
Santoprene 121-80B200 – UV-resistant black TPV designed for strong bonding on small contact areas, thin lips and complex weatherseal geometries.
Santoprene 121-70B260 – Lower-hardness B260-series TPV option for automotive weatherseal applications requiring more flexibility.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 121-80B260
| Document Type | Description |
|---|---|
| TDS | Current Celanese physical, mechanical and injection-processing data |
| SDS | Safety Data Sheet |
| Automotive Information | Weatherseal corner-molding positioning and OEM references |
| Processing Guide | Injection molding guidance for Santoprene TPV |
| COA | Batch-specific quality information where available |
Current Celanese material data lists automotive references including Renault FRM 18-27-207 and SAIC Motor SMTC 5 320 024.
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FAQ About Santoprene 121-80B260
Q1: What is Santoprene 121-80B260?
Santoprene 121-80B260 is a hard black automotive TPV from Celanese designed for complex weatherseal corner molding and end caps.
Q2: What is the hardness of Santoprene 121-80B260?
The current Celanese value is approximately Shore A 78.
Q3: Does Santoprene 121-80B260 bond to EPDM?
Yes. Celanese specifically states that the grade adheres to vulcanized EPDM rubber.
Q4: Does it bond to TPV?
Yes. The material is also formulated for bonding to TPV weatherseal profiles.
Q5: Is Santoprene 121-80B260 a low-friction grade?
Yes. Celanese lists built-in low coefficient of friction properties as a key feature.
Q6: What is the elongation at break?
Current grade data lists approximately 640%.
Q7: What is the tensile stress at break?
The current value is approximately 11 MPa.
Q8: What processing method is recommended?
The grade is designed primarily for injection molding and multi-injection molding of complex automotive weatherseal corners and end caps.
Q9: What melt temperature should be used?
Current grade-specific guidance lists approximately 210–230°C, with an optimum around 220°C.
Q10: What is the difference between Santoprene 121-80B260 and 121-80B230?
Both are automotive bonding grades for weatherseal corner molding. 121-80B260 combines built-in low COF with TPV/EPDM bonding and currently lists 11 MPa break strength and 640% elongation, while 121-80B230 is a slightly harder corner-molding grade with enhanced COF properties.
Request Santoprene 121-80B260 Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 121-80B260, please provide:
- Required quantity
- Destination country or port
- Automotive weatherseal application
- Glass run channel, corner molding or end-cap design
- TPV or EPDM extrusion substrate
- Required bonding performance
- Required coefficient of friction
- Surface appearance requirement
- Part dimensions
- Gate and runner design
- Injection-molding machine size
- OEM specification requirement
- TDS, SDS or COA requirement
- Sample requirement, if applicable
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