描述
Santoprene 121-80B200 is a soft, black and UV-resistant thermoplastic vulcanizate (TPV) from Celanese developed specifically for automotive sealing and corner-molding applications where strong bonding to vulcanized EPDM or TPV materials is required.
Unlike a standard 80 Shore A Santoprene grade, Santoprene 121-80B200 is a dedicated bonding formulation. Celanese states that it is specially formulated to enhance bonding onto EPDM vulcanized parts and TPV materials, including weatherseals where the available bonding area is small.
That feature is especially useful for automotive weatherseals with thin lips, narrow joining sections and complex corner geometry. In these applications, a molded TPV corner or end cap must bond reliably to an existing extruded EPDM or TPV profile while preserving flexibility and appearance.
Celanese also highlights adhesion over a wide temperature range. This supports molded joints that must tolerate both assembly deformation and vehicle service temperature changes.
Another important characteristic of Santoprene 121-80B200 is its higher gloss. Celanese positions this as an advantage for matching the appearance of the molded corner to the mating extruded profile. For visible sealing systems such as glass run channels and door weatherseals, a closer gloss match can improve the visual continuity of the finished component.
The grade has a Shore A hardness of approximately 81, providing a relatively firm elastomeric response while retaining exceptionally high elongation. Current Celanese data lists approximately 725% elongation at break, 11.9 MPa tensile stress at break, 3.9 MPa tensile stress at 100% elongation and 13.4 MPa shear modulus.
The density is approximately 0.910 g/cm³, making the material relatively lightweight for an automotive elastomeric compound.
Santoprene 121-80B200 is also UV resistant, supporting exterior automotive sealing applications where black elastomeric parts may experience prolonged sunlight exposure.
The material is polyolefin based and Celanese states that it is recyclable within the manufacturing stream. It can be processed on conventional thermoplastics equipment and is primarily positioned for injection molding.
The grade is shear dependent, so its apparent melt viscosity decreases as shear rate increases. This behavior can be useful when filling thin corner sections and complex weatherseal geometries.
Celanese gives an optimum injection melt temperature of approximately 215°C and recommends desiccant drying for 3 hours at 80°C. The broader Santoprene TPV processing window is approximately 175–230°C.
Current Celanese material data also lists automotive specification references from Mercedes-Benz, Stellantis, Geely, Li Auto, Renault, SAIC Motor and Volkswagen Group, reinforcing the grade’s established automotive-sealing positioning.
For more TPV materials, visit our TPV Thermoplastic Vulcanizates Product Category →.
For Celanese’s current grade selection, see the Official Celanese Santoprene & Geolast TPV Product Finder →.
Key Features of Santoprene 121-80B200
| Feature | Engineering Benefit |
|---|---|
| Improved Bonding to Vulcanized EPDM | Designed for molded corners and end caps on EPDM weatherseal profiles |
| Improved Bonding to TPV | Supports TPV-to-TPV profile joining and molded sealing constructions |
| Shore A 81 | Firm elastomeric response for automotive sealing geometry |
| 725% Elongation at Break | Excellent deformability during assembly and service |
| 11.9 MPa Stress at Break | High tensile performance for a flexible TPV |
| 3.9 MPa Stress at 100% Elongation | Useful resistance to deformation while maintaining elasticity |
| UV Resistant | Supports exterior automotive sealing applications |
| High Flexibility | Suitable for dynamic profiles and molded corners |
| Higher Gloss | Helps molded corners visually match extruded profiles |
| Small Contact-Area Bonding | Useful for thin lips and complex weatherseal geometry |
| Injection Moldable | Compatible with conventional thermoplastic injection equipment |
| Polyolefin Based | Low density and manufacturing-stream recyclability |
| Shear-Dependent Flow | Flow improves as shear rate increases during molding |
The core value of Santoprene 121-80B200 is the combination of bonding performance, high elongation and appearance matching for automotive weatherseal corner molding.
Typical Applications for Santoprene 121-80B200
Santoprene 121-80B200 is primarily an automotive sealing and profile-bonding material.
| Application Area | Typical Use |
|---|---|
| Automotive Corner Molding | Molded corners joining weatherseal profile sections |
| Weatherseal End Caps | Molded finishing sections bonded to EPDM or TPV profiles |
| Glass Run Channel Corners | Complex molded joining areas in window sealing systems |
| Door Weatherseals | Corner joints and molded sealing transitions |
| Body Sealing Profiles | Molded connections between extruded profile sections |
| EPDM Profile Overmolding | Injection molding directly onto vulcanized EPDM |
| TPV Profile Overmolding | Joining or finishing molded sections on TPV extrusions |
| Thin-Lip Weatherseals | Applications where the bonding contact area is small |
| Complex Geometry Seals | Molded corners with difficult flow and adhesion requirements |
| Visible Sealing Surfaces | Applications requiring a close gloss match between molded and extruded sections |
The grade is especially relevant when a conventional TPV does not provide enough bonding performance on vulcanized EPDM in a restricted joining area.
Typical Properties of Santoprene 121-80B200
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 910 kg/m³ / 0.910 g/cm³ | ISO 1183 |
| Shore A Hardness, 15 s | 81 | ISO 48-4 / ISO 868 |
| Color | Black | Manufacturer information |
| Material Family | TPV / TPE | Manufacturer information |
| Base Chemistry | Polyolefin-based TPV | Manufacturer information |
| UV Resistance | Yes | Manufacturer positioning |
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile Stress at 100% Elongation | 3.9 MPa | ISO 527-1/-2 or ISO 37 |
| Tensile Stress at Break | 11.9 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break | 725% | ISO 527-1/-2 or ISO 37 |
| Shear Modulus | 13.4 MPa | ISO 6721 |
| Shore A Hardness | 81 | ISO 48-4 / ISO 868 |
The 725% elongation at break is a standout characteristic of Santoprene 121-80B200, allowing a firm 81A material to tolerate very large deformation.
Bonding Performance
Celanese identifies Santoprene 121-80B200 as part of its dedicated bonding-grade family. The grade is designed to:
- Bond to vulcanized EPDM
- Bond to TPV
- Maintain adhesion over a broad temperature range
- Improve bonding where only a small contact area is available
- Support thin-lip profile geometry
- Support complex automotive weatherseal corners
- Produce a higher-gloss molded surface for better profile appearance matching
This differentiates Santoprene 121-80B200 from a standard general-purpose 80A TPV.
UV & Exterior Performance
Santoprene 121-80B200 is specifically described by Celanese as UV resistant. This supports applications such as automotive exterior weatherseals, door perimeter seals, glass run channels, window sealing systems and body sealing profiles.
Automotive OEM References for Santoprene 121-80B200
Current Celanese Materials Database information lists the following specification references:
| OEM | Specification / Reference |
|---|---|
| Mercedes-Benz Group | DBL 5562 |
| Stellantis – PSA Group | PMP 01378_15_01962 |
| Stellantis – FCA Group | 55248/02, EMP-80 |
| Geely | Q/JLY J7110166B |
| Li Auto | Q/LiA5310057, 2021 (V2) |
| Renault | FRM 18-27-142 |
| SAIC Motor | SMTC 5 320 024 |
| Volkswagen Group | VW50123 |
These references reinforce the automotive sealing and profile-joining role of Santoprene 121-80B200.
Why Choose Santoprene 121-80B200?
The main reason to choose Santoprene 121-80B200 is its dedicated bonding performance.
In a weatherseal corner-molding application, adhesion to the existing extrusion can be more important than hardness alone. If a molded corner separates from an EPDM profile, the entire sealing system can fail regardless of the base elastomer’s other properties.
Santoprene 121-80B200 is formulated specifically to improve this joint.
It adheres to vulcanized EPDM and TPV over a wide temperature range and is designed to perform even when the available bonding area is relatively small.
The 81 Shore A hardness gives the molded corner enough support to retain geometry, while 725% elongation allows it to move with the surrounding weatherseal.
The 11.9 MPa tensile stress at break provides strong mechanical performance for handling, assembly and repeated door or window movement.
Higher gloss is another application-specific advantage. Automotive sealing systems often combine long extruded sections with localized molded corners. A pronounced difference in surface gloss can make the joint visually obvious. The B200 formulation helps the molded section better match the mating extruded profile.
UV resistance supports exterior use, and the low density helps control component weight.
For customers producing automotive EPDM weatherseals, glass run channels, body seals or TPV sealing profiles requiring molded corners, Santoprene 121-80B200 is a targeted bonding solution rather than a generic TPV grade.
Processing Guidelines for Santoprene 121-80B200
Santoprene 121-80B200 is primarily designed for injection molding on conventional thermoplastic equipment.
Published Processing Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Recommended Drying | Yes |
| Drying Temperature | 80°C |
| Drying Time | 3 hours |
| Injection Melt Temperature – Optimum | 215°C |
| General Santoprene TPV Processing Window | 175–230°C |
| Processing Behavior | Shear dependent |
| Incompatible Materials | Acetal (POM) and PVC |
The optimum injection melt temperature of approximately 215°C is a practical starting point for molding trials.
Production settings should be optimized around weatherseal geometry, substrate temperature, contact area, gate location, injection speed, surface gloss, bond-line quality and cycle time.
Shear-Dependent Flow Behavior
Santoprene TPV exhibits shear-thinning behavior. As shear rate increases, apparent viscosity decreases.
For Santoprene 121-80B200, processors should pay particular attention to gate size, injection speed, screw speed, melt temperature and flow length. Higher shear can improve filling of narrow corner sections and thin-lip features.
EPDM Surface & Bonding Considerations
Because Santoprene 121-80B200 is used specifically for bonding to vulcanized EPDM, substrate condition can directly influence the final joint. Important production factors include a clean bonding surface, consistent EPDM formulation, adequate contact area, correct insert positioning and stable molding conditions.
Purging
Celanese notes that Santoprene TPV is incompatible with POM and PVC. Processing equipment should therefore be thoroughly purged when switching between these materials and Santoprene 121-80B200.
Santoprene 121-80B200 vs. Santoprene 121-65B200
| Feature | Santoprene 121-80B200 | Santoprene 121-65B200 |
|---|---|---|
| Material Family | TPV | TPV |
| Color | Black | Black |
| Main Positioning | Improved bonding to TPV & EPDM | Improved bonding to TPV & EPDM |
| Main Process | Injection molding / corner molding | Injection molding / corner molding |
| Shore A Hardness | 81 | 67 |
| Elongation at Break | 725% | 600% |
| Tensile Stress at Break | 11.9 MPa | 9.2 MPa |
| Tensile Stress @ 100% Elongation | 3.9 MPa | 2.3 MPa |
| Compression Set @ 70°C | Not listed in current Product Finder | Approx. 48% |
| Bonding Target | TPV & vulcanized EPDM | TPV & vulcanized EPDM |
| Main Selection Difference | Higher hardness and higher tensile strength | Softer and more compliant |
Choose Santoprene 121-80B200 when the molded corner requires greater hardness, tensile strength and dimensional support. Choose Santoprene 121-65B200 when a softer bonding grade is preferred.
Related Products
Santoprene 121-65B200 – Softer black bonding TPV for improved adhesion to TPV and vulcanized EPDM.
Santoprene 121-80B230 – Black bonding TPV combining improved TPV/EPDM adhesion with lower coefficient of friction.
Santoprene 121-80B260 – Black automotive corner-molding TPV with improved bonding and low-friction positioning.
Santoprene 121-73W175 – UV-stabilized profile-extrusion TPV for automotive sealing systems.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 121-80B200
| Document Type | Description |
|---|---|
| TDS | Current Celanese physical, mechanical and processing data |
| SDS | Safety Data Sheet |
| Automotive OEM Information | Mercedes-Benz, Stellantis, Geely, Li Auto, Renault, SAIC and VW specification references |
| Santoprene Product Finder | Current Celanese TPV grade comparison |
| Automotive Grade Slate | Corner molding and profile-sealing positioning |
| Processing Guidance | Injection molding and EPDM weatherseal corner-molding information |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 121-80B200
Q1: What is Santoprene 121-80B200?
Santoprene 121-80B200 is a black UV-resistant TPV from Celanese designed for automotive sealing and corner molding with improved bonding to vulcanized EPDM and TPV materials.
Q2: What is the hardness of Santoprene 121-80B200?
The current Celanese value is approximately Shore A 81.
Q3: What is the elongation at break?
Current Celanese data lists approximately 725% elongation at break.
Q4: What is the tensile stress at break?
The current value is approximately 11.9 MPa.
Q5: Does Santoprene 121-80B200 bond to EPDM?
Yes. Celanese specifically formulates the grade to enhance bonding to vulcanized EPDM and TPV materials.
Q6: Why is Santoprene 121-80B200 used for automotive corner molding?
It combines improved EPDM/TPV bonding, high elongation, higher gloss and good adhesion where the contact area is small, such as thin weatherseal lips and complex corners.
Q7: Is Santoprene 121-80B200 UV resistant?
Yes. Celanese describes the grade as UV resistant, supporting automotive exterior weatherseal applications.
Q8: What is the density?
The current density is approximately 0.910 g/cm³.
Q9: What processing temperature is recommended?
Celanese gives an optimum injection melt temperature of approximately 215°C. The broader Santoprene TPV processing window is approximately 175–230°C.
Q10: What is the difference between Santoprene 121-80B200 and 121-65B200?
Both are black bonding grades for TPV and vulcanized EPDM. 121-80B200 is harder at Shore A 81 and has higher tensile strength, while 121-65B200 is softer at approximately Shore A 67.
Request Santoprene 121-80B200 Price & Technical Support
For pricing, availability, documents or application support for Santoprene 121-80B200, please provide the required quantity, destination country or port, automotive weatherseal application, EPDM or TPV substrate, corner or end-cap design, profile cross-section, bonding contact area, surface-gloss requirement, UV exposure, molding process and any OEM specification or document requirement.
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