描述
Santoprene 121-65B200 is a soft, black, UV-resistant thermoplastic vulcanizate from Celanese engineered specifically for bonding to vulcanized EPDM rubber.
Its main use is not simply as a general-purpose TPV. The grade is designed for automotive and sealing applications in which a molded TPV section must bond reliably to a pre-existing thermoset EPDM profile.
Celanese specifically positions Santoprene 121-65B200 for corner molding, end caps and other special applications requiring adhesion to thermoset EPDM.
This makes the material especially important in automotive weatherseal systems. A vehicle sealing profile may use vulcanized EPDM for the long extruded section and a TPV for molded corners, joints or end pieces. The interface between the two materials must maintain integrity despite flexing, weather exposure and temperature changes.
The 121-65B200 grade was formulated around this requirement.
Celanese highlights four grade-specific features:
- Adhesion to vulcanized EPDM over a wide temperature range
- High flexibility for dynamic EPDM applications
- Higher gloss to help match EPDM mating surfaces
- Suitability for sealing applications
The current Shore A hardness is approximately 67, providing a medium-soft elastomeric feel. This hardness is suitable for automotive corner molds and sealing joints that need both flexibility and dimensional support.
Mechanical performance is unusually strong for a soft TPV. Current Celanese data lists approximately 9.2 MPa tensile stress at break, 2.3 MPa tensile stress at 100% elongation and 600% elongation at break.
The very high elongation helps the material deform during assembly and repeated service without becoming brittle.
Compression-set performance is approximately 22% at 23°C for 24 hours and 48% at 70°C for 24 hours.
The material density is approximately 0.910 g/cm³, making it lighter than many conventional rubber compounds.
Another important feature is its UV resistance. Current Celanese data specifically describes the grade as UV resistant and stable for weather-exposed use. This is highly relevant to automotive exterior sealing systems that operate for years under sunlight, temperature cycling, moisture and ozone exposure.
Santoprene 121-65B200 is polyolefin based and can be processed on conventional thermoplastic equipment. Celanese lists injection molding and multi-injection molding for the current grade.
Because it behaves like a thermoplastic during processing, it can simplify corner molding and end-cap production compared with conventional thermoset rubber processing.
For more TPV materials, visit our TPV Thermoplastic Vulcanizates Product Category →.
For official Santoprene TPV information, visit the Celanese Santoprene TPV Product Page →.
For the current grade portfolio, see the Official Celanese Santoprene & Geolast Product Finder →.
Key Features of Santoprene 121-65B200
| Feature | Engineering Benefit |
|---|---|
| Adhesion to Vulcanized EPDM | Enables molded TPV corner and end-cap bonding to EPDM profiles |
| Wide-Temperature EPDM Bonding | Supports automotive sealing systems exposed to changing temperatures |
| UV Resistance | Suitable for exterior and weather-exposed sealing applications |
| Shore A 67 | Balanced softness and support |
| 600% Elongation at Break | Excellent flexibility for dynamic joints and corners |
| 9.2 MPa Stress at Break | Strong mechanical performance for a soft TPV |
| High Flexibility | Well suited to dynamic EPDM sealing applications |
| Higher Gloss | Helps visually match EPDM mating surfaces |
| Low Density, 0.91 g/cm³ | Supports lightweight component design |
| Injection Molding | Suitable for corner molding and end-cap production |
| Multi-Injection Molding | Supports integrated multi-material automotive parts |
| Polyolefin Based | Conventional TPV processing and manufacturing-stream recyclability |
| Shear-Dependent Flow | Flow improves as shear rate increases |
The main value of Santoprene 121-65B200 is its ability to combine EPDM bonding, high elongation, UV resistance and injection-molding processability in one material.
Typical Applications for Santoprene 121-65B200
Santoprene 121-65B200 is primarily an automotive sealing and EPDM-bonding grade.
| Application Area | Typical Use |
|---|---|
| Automotive Corner Molding | Molded corners joining EPDM weatherseal profiles |
| End Caps | Molded end sections bonded to vulcanized EPDM |
| Weatherseals | Vehicle door, roof, window and body sealing systems |
| Dynamic Seals | Flexible joints exposed to repeated movement |
| EPDM/TPV Hybrid Seals | Multi-material sealing components |
| Exterior Automotive Seals | UV-exposed molded sealing sections |
| Special EPDM Bonding Applications | Parts requiring adhesion to vulcanized EPDM |
| Multi-Injection Components | Integrated molded parts combining compatible materials |
The most important application question is whether the component needs direct adhesion to vulcanized EPDM. If the answer is yes, Santoprene 121-65B200 is much more targeted than a standard general-purpose 121-series grade.
Typical Properties of Santoprene 121-65B200
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 910 kg/m³ / 0.910 g/cm³ | ISO 1183 |
| Shore A Hardness, 15 s | 67 | ISO 48-4 / ISO 868 |
| Resin Identification | TPV | ISO 1043 |
| Part Marking Code | >TPV< | ISO 11469 |
| Color | Black | Manufacturer information |
| Delivery Form | Pellets | Manufacturer information |
| Special Characteristic | UV stabilized / weather stable | Manufacturer information |
The density of approximately 0.91 g/cm³ is lower than many conventional elastomer compounds and can support weight reduction in automotive sealing systems.
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile Stress at 100% Elongation, Perpendicular | 2.3 MPa | ISO 37 |
| Tensile Stress at Break, Perpendicular | 9.2 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break, Perpendicular | 600% | ISO 527-1/-2 or ISO 37 |
| Shore A Hardness | 67 | ISO 48-4 / ISO 868 |
| Compression Set, 23°C / 24 h | 22% | ISO 815 |
| Compression Set, 70°C / 24 h | 48% | ISO 815 |
These values show that Santoprene 121-65B200 combines moderate hardness with very high extensibility.
EPDM Bonding Performance
Celanese does not publish one universal numerical peel-strength value for this grade in the current public datasheet.
Instead, the grade is specifically described as:
- Formulated to bond to thermoset EPDM rubber
- Suitable for corner molding
- Suitable for end caps
- Designed for applications requiring adhesion to vulcanized EPDM
- Capable of adhering to EPDM over a wide range of temperatures
- Highly flexible for dynamic EPDM applications
This manufacturer-defined positioning is the most important design characteristic of Santoprene 121-65B200.
Actual bond strength in production depends on EPDM compound formulation, surface condition, mold temperature, insert temperature, residence time, injection conditions and part geometry.
Automotive OEM References for Santoprene 121-65B200
Current Celanese Materials Database information lists multiple automotive specification references for Santoprene 121-65B200.
| OEM | Specification / Reference |
|---|---|
| Geely | Q/JLY J7110166C-2024 |
| Li Auto | Q/LiA5310057, 2021 V2 |
| Mercedes-Benz | DBL 5562 |
| Renault | FRM 18-27-141 / special-part approval context |
| SAIC Motor | SMTC 5 320 024 |
| Stellantis | 55248_02 EMP60 01378_21_03313 |
| Volkswagen Group | VW 50123 |
| Volkswagen Group | VW 50180 |
| Volkswagen Group | VW TL 526 41-C |
| Volkswagen Group | VW TL 527 03 |
These references strengthen the grade’s positioning for automotive weatherseals, corner molding and EPDM-bonded exterior components.
Why Choose Santoprene 121-65B200?
The strongest reason to select Santoprene 121-65B200 is its specialized bonding behavior.
Many Santoprene TPV grades can provide flexibility, weather resistance and conventional thermoplastic processing, but not every grade is optimized to bond directly to vulcanized EPDM.
That distinction matters in automotive weatherseal production.
A typical weatherseal may be produced as a long EPDM extrusion. Corners, junctions and terminal shapes are then molded around or onto the EPDM section.
If the molded material does not adhere adequately to the cured EPDM, the joint can become a weak point.
Santoprene 121-65B200 was developed specifically for these interfaces.
Its 67 Shore A hardness provides enough softness to move with the EPDM seal.
Its 600% elongation allows significant deformation around dynamic corners and joints.
The 9.2 MPa tensile stress at break provides useful strength for molded connections.
The higher-gloss surface helps reduce visual mismatch between the TPV molding and the EPDM mating section.
UV resistance also supports exterior service.
The grade is particularly useful for automotive suppliers that want thermoplastic molding efficiency while retaining a compatible interface with thermoset EPDM weatherseal systems.
Because Santoprene 121-65B200 can be injection molded, corner pieces and end caps can be produced directly around prepared EPDM inserts.
Multi-injection molding can also support more integrated component designs.
Processing Guidelines for Santoprene 121-65B200
The current 2025 Celanese Materials Database lists injection molding and multi-injection molding as the grade-specific processing methods for Santoprene 121-65B200.
Current Grade-Specific Injection Conditions
| Processing Parameter | Current Celanese Guidance |
|---|---|
| Drying Recommended | Yes |
| Drying Temperature | 65°C |
| Drying Time, Dehumidified Dryer | ≥3 hours |
| Maximum Processing Moisture | ≤0.08% |
| Optimum Melt Temperature | 240°C |
| Minimum Melt Temperature | 220°C |
| Maximum Melt Temperature | 260°C |
| Optimum Mold Temperature | 40°C |
| Minimum Mold Temperature | 30°C |
| Maximum Mold Temperature | 50°C |
| Screw Speed | 100–200 rpm recommended |
| Holding Pressure | 50–75% of actual injection pressure |
| Optional Back Pressure | 0.3–0.7 MPa |
The current 2025 grade sheet should be the primary starting point for this specific material.
Celanese also includes a broader Santoprene-family processing note recommending approximately 3 hours at 80°C and a general TPV processing window of 175–230°C.
Because the current exact grade table specifies 65°C drying and 220–260°C melt temperature, use the grade-specific values first when setting up Santoprene 121-65B200, then optimize for the actual mold, EPDM insert and part geometry.
Shear-Dependent Flow Behavior
Santoprene TPV has relatively high melt viscosity at low shear rates.
As shear increases, apparent viscosity decreases.
Celanese therefore notes that:
- Higher shear can improve flow
- Smaller gates can lower apparent melt viscosity
- Higher screw RPM can help melt homogeneity
- Temperature increases alone may have relatively limited effect on melt viscosity
This behavior is important for corner molding because the melt must fill complex geometries while also forming a strong interface with the EPDM insert.
EPDM Insert Molding Considerations
For EPDM-bonding applications, evaluate:
- EPDM compound chemistry
- EPDM surface cleanliness
- EPDM insert temperature
- Insert age and storage condition
- Mold temperature
- Melt temperature
- Injection speed
- Holding pressure
- Gate location
- Contact pressure at the bonding interface
- Cooling time
- Bond-area geometry
The exact EPDM compound can strongly influence adhesion. Production trials should therefore use the actual EPDM profile rather than a generic laboratory insert.
Material Compatibility
Celanese states that Santoprene TPV is incompatible with acetal (POM) and PVC.
Equipment should be thoroughly purged when switching from POM or PVC before processing Santoprene 121-65B200.
Santoprene 121-65B200 vs. Santoprene 121-80B200
| Feature | Santoprene 121-65B200 | Santoprene 121-80B200 |
|---|---|---|
| Material Family | TPV | TPV |
| Color | Black | Black |
| Main Positioning | Improved bonding to TPV and EPDM | Improved bonding to TPV and EPDM |
| Shore A Hardness | 67 | 81 |
| Elongation at Break | 600% | 725% |
| Tensile Stress at Break | 9.2 MPa | 11.9 MPa |
| Tensile Stress @ 100% Elongation | 2.3 MPa | 3.9 MPa |
| Compression Set @ 70°C | 48% | Not listed in current Product Finder table |
| Main Selection Difference | Softer / more compliant EPDM-bonding grade | Harder / stronger EPDM-bonding grade |
Both grades belong to Celanese’s dedicated bonding TPV family.
Choose Santoprene 121-65B200 when a softer 67A material is preferred for flexible weatherseal corners and dynamic EPDM joints.
Choose Santoprene 121-80B200 when the same bonding concept is required with greater hardness and tensile strength.
Related Products
Santoprene 121-80B200 – Harder black EPDM-bonding TPV with Shore A 81 hardness.
Santoprene 121-70B230 – Bonding TPV with improved EPDM/TPV adhesion plus low coefficient of friction.
Santoprene 121-70B260 – Automotive corner-molding TPV with low coefficient of friction and improved bonding to TPV and EPDM.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 121-65B200
| Document Type | Description |
|---|---|
| TDS | Current Celanese physical, mechanical and processing data |
| SDS | Safety Data Sheet |
| OEM Approval Information | Automotive specification references |
| Santoprene Product Finder | Bonding-grade comparison and application positioning |
| Injection Molding Guide | Processing guidance for Santoprene TPV |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 121-65B200
Q1: What is Santoprene 121-65B200?
Santoprene 121-65B200 is a black UV-resistant TPV from Celanese specifically formulated to bond to vulcanized EPDM rubber.
Q2: What is the hardness of Santoprene 121-65B200?
The current Shore A hardness is approximately 67.
Q3: What is the main application?
Its main applications are automotive corner molding, end caps, weatherseals and other parts requiring adhesion to thermoset EPDM.
Q4: Does Santoprene 121-65B200 bond to EPDM?
Yes. Celanese specifically designed the grade to bond to vulcanized EPDM over a wide range of temperatures.
Q5: What is the elongation at break?
Current Celanese data lists approximately 600% elongation at break.
Q6: What is the tensile stress at break?
The current value is approximately 9.2 MPa.
Q7: Is Santoprene 121-65B200 UV resistant?
Yes. Current Celanese material data describes the grade as UV resistant / weather stable.
Q8: Can Santoprene 121-65B200 be injection molded?
Yes. Current Celanese data lists injection molding and multi-injection molding.
Q9: What processing temperature should be used?
The current 2025 grade sheet lists a 220–260°C melt-temperature range, with an optimum around 240°C, and a mold-temperature range of approximately 30–50°C.
Q10: What is the difference between Santoprene 121-65B200 and 121-80B200?
Both are black bonding TPV grades designed for improved adhesion to EPDM and TPV. 121-65B200 is softer at Shore A 67, while 121-80B200 is harder at approximately Shore A 81 and provides higher tensile strength.
Request Santoprene 121-65B200 Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 121-65B200, please provide:
- Required quantity
- Destination country or port
- Automotive weatherseal or other application
- Corner mold, end cap or other bonded geometry
- EPDM compound or specification
- Required Shore hardness
- Operating-temperature range
- Outdoor / UV exposure
- Dynamic flexing requirement
- Injection-molding or multi-injection process
- OEM specification requirement
- Required TDS, SDS or approval documents
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