描述
Santoprene 121-80B230 is a soft, black thermoplastic vulcanizate (TPV) from Celanese specifically formulated for automotive glass run channel corner molding, end caps and special fixation applications.
Its defining technical advantage is adhesion to sulfur-cured or peroxide-cured thermoset EPDM rubber. Celanese also states that the grade adheres to TPV across a wide range of temperatures.
This makes Santoprene 121-80B230 fundamentally different from a standard general-purpose Santoprene grade selected only by hardness.
The material was designed to replace thermoset EPDM rubber in selected automotive glass run channel corner-molding applications while reducing processing time.
Automotive glass run channels typically combine long extruded EPDM or TPV profiles with molded corners, joints, end caps or fixation features. These transition points need a material that can bond reliably to the existing weatherseal substrate while also reproducing complex molded geometry.
Santoprene 121-80B230 is targeted directly at this manufacturing problem.
Celanese identifies the grade as suitable for injection molding and multi-injection molding on conventional thermoplastic equipment. Because it is a TPV rather than a conventional thermoset rubber, the molding process avoids a separate vulcanization step for the molded TPV component.
This can shorten manufacturing cycles in corner molding and end-cap production.
Another important property is its enhanced coefficient-of-friction behavior. Celanese’s current product finder describes the B230 family positioning as offering a low coefficient of friction together with improved bonding to TPV and EPDM.
Low-friction surface behavior is particularly valuable in automotive glass run channels because the glass must slide through the sealing profile repeatedly without excessive drag.
The current Shore A hardness is approximately 80. This makes the grade firm enough to provide geometric support in molded corners and fixation areas while still retaining strong elastomeric flexibility.
Current grade-level mechanical data lists approximately 540% elongation at break, 8.3 MPa stress at break and 3.3 MPa stress at 100% elongation.
These values show that Santoprene 121-80B230 remains highly extensible despite its 80 Shore A hardness.
The current compression-set value is approximately 50% at 70°C for 24 hours.
Density is approximately 0.920 g/cm³, giving the material a relatively low specific gravity compared with many conventional elastomer systems.
The current Celanese Materials Database also lists Hyundai MS220-13, Type C-1 as an OEM specification reference for this grade.
For more TPV materials, visit our TPV Thermoplastic Vulcanizates Product Category →.
For Celanese’s broader Santoprene portfolio, see the Official Celanese Santoprene & Geolast Product Finder →.
Key Features of Santoprene 121-80B230
| Feature | Engineering Benefit |
|---|---|
| Shore A 80 | Firm elastomeric response for molded weatherseal corners and fixation parts |
| Bonds to Vulcanized EPDM | Suitable for sulfur- or peroxide-cured EPDM weatherseal substrates |
| Bonds to TPV | Supports TPV-to-TPV corner molding and joining |
| Enhanced Low-COF Performance | Helps reduce sliding resistance in glass run channel systems |
| 540% Elongation at Break | High flexibility despite relatively high hardness |
| 8.3 MPa Stress at Break | Useful mechanical strength for molded automotive components |
| Injection Moldable | Compatible with conventional thermoplastic injection-molding equipment |
| Shorter Processing Time | Designed as a faster-processing alternative to selected thermoset EPDM molding operations |
| Polyolefin Based | Low density and thermoplastic processing behavior |
| Manufacturing-Stream Recyclability | Controlled process scrap can be recycled within the manufacturing stream |
| Black Color | Appropriate for automotive weatherseal and exterior trim systems |
| Automotive OEM Reference | Current Celanese data lists Hyundai MS220-13 Type C-1 |
The combination of EPDM bonding, TPV bonding and controlled friction performance is the core value of Santoprene 121-80B230.
Typical Applications for Santoprene 121-80B230
The primary application area for Santoprene 121-80B230 is automotive weather sealing.
| Application Area | Typical Use |
|---|---|
| Glass Run Channel Corner Molding | Molded corners joining extruded EPDM or TPV glass run profiles |
| Weatherseal End Caps | Molded end closures on automotive sealing systems |
| Special Fixation Parts | Molded clips, retaining features and attachment elements |
| Automotive Weather Seals | Molded sections integrated with weatherseal profiles |
| Automotive Exterior Trim | Flexible black exterior sealing and trim components |
| EPDM-to-TPV Transition Areas | Molded interfaces requiring adhesion to vulcanized EPDM |
| TPV-to-TPV Joining | Molded joints between compatible TPV profiles |
| Low-Friction Glass Contact Zones | Areas where reduced sliding resistance is required |
The grade is especially relevant when a processor already uses an EPDM glass run profile and needs a thermoplastic corner-molding material that can adhere to that substrate.
Typical Properties of Santoprene 121-80B230
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 920 kg/m³ / 0.920 g/cm³ | ISO 1183 |
| Specific Gravity | 0.920 | ASTM D792 |
| Shore A Hardness, 15 s | 80 | ISO 48-4 / ISO 868 |
| Color | Black | Manufacturer information |
| Product Form | Pellets | Manufacturer information |
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Stress at 100% Elongation | 3.3 MPa | ISO 527-1/-2 or ISO 37 |
| Stress at Break | 8.3 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break | 540% | ISO 527-1/-2 or ISO 37 |
| Shore A Hardness | 80 | ISO 48-4 / ISO 868 |
| Compression Set, 70°C / 24 h | 50% | ISO 815 |
These values show a relatively firm but highly extensible TPV profile.
Adhesion & Friction Performance
Celanese does not publish a single universal bond-strength number for Santoprene 121-80B230 because actual adhesion depends strongly on the EPDM compound, cure system, substrate temperature, mold design and processing conditions.
Instead, the manufacturer defines the grade around the following application capabilities:
- Adheres to sulfur-cured thermoset EPDM
- Adheres to peroxide-cured thermoset EPDM
- Adheres to TPV
- Maintains adhesion over a wide temperature range
- Provides enhanced coefficient-of-friction performance
- Supports glass run channel corner molding
- Supports molded end caps and special fixation features
Why Choose Santoprene 121-80B230?
The strongest reason to choose Santoprene 121-80B230 is its ability to simplify automotive weatherseal corner molding.
Traditional EPDM weatherseal systems often rely on thermoset rubber corner molding. This requires material preparation and a curing step, which can increase cycle time.
A thermoplastic vulcanizate can be injected directly using conventional thermoplastic processing equipment.
Celanese specifically developed Santoprene 121-80B230 as a possible replacement for thermoset EPDM in automotive glass run channel corner-molding applications.
The grade is not simply a generic black TPV. Its adhesion package is designed around bonding to cured EPDM rubber and TPV substrates.
This is particularly important because the molded corner must remain attached to the extruded profile during installation and throughout vehicle service.
Its friction behavior also supports glass run channel performance. Excessive friction can cause glass movement problems, noise and increased operating force.
A material with enhanced low-COF behavior can help the glass move more smoothly through the sealing channel.
The 80 Shore A hardness gives the molded corner enough firmness to maintain shape, while 540% elongation at break provides substantial flexibility during assembly and service.
The 8.3 MPa stress at break provides useful mechanical strength for fixation features and corner geometry.
For automotive weatherseal manufacturers seeking a black injection-molding TPV specifically designed for EPDM bonding and low-friction glass run channel corners, Santoprene 121-80B230 is a highly targeted grade.
Processing Guidelines for Santoprene 121-80B230
Santoprene 121-80B230 is primarily designed for:
- Injection molding
- Multi-injection molding
- Automotive corner molding
- End-cap molding
- Special fixation molding
Current Celanese Processing Guidance
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying | Recommended |
| Drying Temperature | 65°C |
| Drying Time | 3 hours |
| General Processing Temperature Window | 175–230°C |
| Processing Equipment | Conventional thermoplastic injection-molding equipment |
Celanese recommends desiccant drying for approximately 3 hours at 65°C.
The manufacturer states that Santoprene TPV has a broad processing-temperature window of approximately 175–230°C.
Shear-Dependent Flow
Santoprene 121-80B230 is shear dependent.
As shear rate increases, the apparent melt viscosity decreases. This behavior is important when optimizing injection speed, gate design, gate size, screw speed, back pressure, melt temperature, mold temperature, flow length, corner geometry and bonding area.
EPDM Bonding Considerations
Because actual bonding depends on the weatherseal construction, processors should evaluate:
- EPDM cure system
- Sulfur-cured versus peroxide-cured EPDM
- Substrate cleanliness
- Surface contamination
- Substrate temperature
- Mold temperature
- Melt temperature
- Injection speed
- Interface pressure
- Bonding area
- Storage condition of the extruded profile
The current Celanese grade description confirms that the material is designed to adhere over a broad temperature range, but production conditions should still be validated on the actual weatherseal compound.
Material Compatibility
Celanese states that Santoprene TPV is incompatible with acetal (POM) and PVC.
Injection equipment should be thoroughly purged when changing between POM, PVC and Santoprene materials.
Santoprene 121-80B230 vs. Santoprene 121-70B260
| Feature | Santoprene 121-80B230 | Santoprene 121-70B260 |
|---|---|---|
| Material Family | TPV | TPV |
| Color | Black | Black |
| Main Positioning | EPDM / TPV bonding, low COF | EPDM / TPV bonding, low COF, auto corner molding |
| Shore A Hardness | 80 | 68 |
| Elongation at Break | 540% | 520% |
| Stress at Break | 8.3 MPa | 6.4 MPa |
| Stress @ 100% Elongation | 3.3 MPa | 2.6 MPa |
| Compression Set Reference | 50% | 49% |
| Primary Difference | Firmer and stronger | Softer and more compliant |
Choose Santoprene 121-80B230 when a firmer molded corner with higher tensile strength is preferred.
Choose Santoprene 121-70B260 when a softer corner-molding TPV is more suitable for the weatherseal design.
Related Products
Santoprene 121-70B260 – Softer black TPV for automotive corner molding with improved EPDM / TPV bonding and low-friction performance.
Santoprene 121-80B260 – Higher-performance black corner-molding TPV with improved EPDM / TPV bonding and low-COF positioning.
Santoprene 121-80B200 – Black 80A TPV within the specialized 121 automotive weatherseal family.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 121-80B230
| Document Type | Description |
|---|---|
| TDS | Current Celanese grade description, mechanical data and processing guidance |
| SDS | Safety Data Sheet |
| Santoprene Product Finder | Grade comparison and application positioning |
| Corner Molding Technical Literature | Injection molding guidance for corners and end caps to EPDM weatherseals |
| OEM Information | Hyundai MS220-13 Type C-1 reference |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 121-80B230
Q1: What is Santoprene 121-80B230?
Santoprene 121-80B230 is a black TPV from Celanese designed for automotive glass run channel corner molding, end caps and special fixation applications.
Q2: What is the hardness of Santoprene 121-80B230?
The current Shore A hardness is approximately 80.
Q3: Can Santoprene 121-80B230 bond to EPDM?
Yes. Celanese specifically states that the grade is designed to adhere to sulfur- or peroxide-cured thermoset EPDM rubber over a wide range of temperatures.
Q4: Can it bond to TPV?
Yes. The grade is also designed to adhere to TPV over a wide temperature range.
Q5: Why is Santoprene 121-80B230 used for glass run channels?
It combines EPDM/TPV bonding with enhanced low-friction performance, which is useful for molded corners where the glass must slide through the weatherseal.
Q6: What is the elongation at break?
Current Celanese data lists approximately 540% elongation at break.
Q7: What is the tensile stress at break?
The current stress at break is approximately 8.3 MPa.
Q8: What is the density?
The current density is approximately 0.920 g/cm³.
Q9: What processing temperature is recommended?
Celanese gives a broad Santoprene TPV processing window of approximately 175–230°C and recommends desiccant drying at approximately 65°C for 3 hours for this grade.
Q10: Does Santoprene 121-80B230 have an automotive OEM reference?
Yes. Current Celanese Materials Database information lists Hyundai MS220-13, Type C-1.
Request Santoprene 121-80B230 Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 121-80B230, please provide:
- Required quantity
- Destination country or port
- Automotive weatherseal application
- Glass run channel, corner, end cap or fixation design
- EPDM or TPV substrate
- Sulfur-cured or peroxide-cured EPDM
- Required Shore hardness
- Coefficient-of-friction requirement
- Bonding requirement
- Injection-molding equipment
- Mold and gate design
- OEM specification requirement
- TDS, SDS or COA requirement
- Sample requirement, if applicable
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