描述
Santoprene 121-75M200 is a black, UV-resistant thermoplastic vulcanizate (TPV) from Celanese developed for high-flow injection molding and automotive glass encapsulation applications.
This grade is different from the standard general-purpose Santoprene 101 series. Its formulation is optimized for easier flow, superior molded-part appearance and efficient filling of difficult geometries.
Celanese’s current TPV Product Finder identifies Santoprene 121-75M200 as a black Shore A 76 grade with improved flow for easier processability. Celanese automotive grade information further places the 121-xxM200 family in glass encapsulation, where high flow, surface quality and molding consistency are especially important.
Automotive glass encapsulation places unusual demands on an elastomer. The material must flow around complex glass-edge geometry, create a clean sealing surface, minimize visible flow defects, and produce a consistent black exterior appearance.
Santoprene 121-75M200 is specifically formulated for these requirements.
Celanese describes the grade as suitable for fast and easy injection molding, particularly for complex part geometries. It can be injected at lower molding temperatures or lower injection pressures than less flowable TPV grades.
This can reduce molding stress, improve cavity filling and help lower the risk of glass damage during encapsulation.
Another major advantage is surface appearance. The grade is designed with a higher-gloss capability, allowing the final gloss level to be adjusted through mold-surface texture.
Celanese specifically recommends Santoprene 121-75M200 for applications requiring superior part appearance with minimal to no visible flow defects or “tiger stripes.”
That makes it particularly relevant to quarter-light encapsulation, fixed side glass, weather seals, decorative sealing edges and other visible automotive exterior components.
The grade has a Shore A hardness of approximately 76, giving it a medium-firm elastomeric feel suitable for automotive sealing while retaining substantial flexibility.
Current grade-specific Celanese data lists approximately 423% elongation at break, 5.77 MPa stress at break, 3.14 MPa stress at 100% elongation, 18 MPa shear modulus and approximately 23.2 kN/m tear strength.
Compression set is approximately 36% at 70°C for 24 hours and 64% at 125°C for 70 hours.
The material density is approximately 0.950 g/cm³, helping produce lightweight encapsulated sealing sections.
Santoprene 121-75M200 is shear dependent, meaning its apparent viscosity falls as shear rate increases. This behavior supports rapid filling of complex cavities when gate design, injection speed, screw speed and melt temperature are properly optimized.
The material is polyolefin based and Celanese states that it can be recycled within the manufacturing stream, subject to part-quality and production specifications.
Current grade-level automotive approvals include references to Mercedes-Benz DBL 5562, GM GMW15812 Type 7M, Geely Q/JLY J7110166B and Li Auto Q/LiA5310057.
For more TPV products, visit our TPV Thermoplastic Vulcanizates Product Category →.
For Celanese’s current grade portfolio, see the Official Celanese Santoprene & Geolast TPV Product Finder →.
Key Features of Santoprene 121-75M200
| Feature | Engineering Benefit |
|---|---|
| High-Flow TPV | Easier filling of complex and long-flow injection-molded geometries |
| Shore A 76 | Balanced firmness and elastomeric sealing performance |
| UV Resistant | Supports automotive exterior and weather-exposed applications |
| Glass Encapsulation Grade | Developed for quarter lights, fixed glass and encapsulated weather seals |
| Superior Surface Appearance | Helps minimize visible flow defects and tiger-striping effects |
| High Gloss Capability | Surface gloss can be tailored through mold texture |
| Lower Injection Pressure Capability | Can reduce molding stress and assist glass encapsulation processing |
| 423% Elongation | Maintains high flexibility and deformation capability |
| 23.2 kN/m Tear Strength | Helps resist tearing in thin sealing lips and molded edges |
| Shear-Dependent Flow | Apparent viscosity decreases with increasing shear rate |
| Polyolefin Based | Low density and conventional thermoplastic processing |
| Manufacturing-Stream Recyclability | Controlled process scrap can be reused where specifications permit |
The defining advantage of Santoprene 121-75M200 is not simply its hardness. It is the combination of high flow, UV resistance, surface quality and glass-encapsulation processability.
Typical Applications for Santoprene 121-75M200
Santoprene 121-75M200 is primarily an automotive exterior and glass-encapsulation grade.
| Application Area | Typical Use |
|---|---|
| Automotive Glass Encapsulation | Molded elastomeric edge around fixed vehicle glass |
| Quarter-Light Encapsulation | Exterior sealing and finishing around quarter windows |
| Side Fixed Glass | Encapsulated sealing sections and perimeter profiles |
| Weather Seals | UV-resistant black exterior sealing components |
| Glass Gaskets | Flexible gaskets around glazing assemblies |
| Visible Exterior Seals | Parts where molded surface quality is important |
| Complex Injection-Molded Seals | Long-flow or difficult cavity geometries |
| Automotive Exterior Components | Black UV-resistant elastomeric trim and sealing parts |
The material is especially attractive where appearance and processing are equally important.
Typical Properties of Santoprene 121-75M200
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 950 kg/m³ / 0.950 g/cm³ | ISO 1183 |
| Specific Gravity | Approx. 0.948 | ASTM D792 |
| Shore A Hardness, 15 s | 76 | ISO 48-4 / ISO 868 |
| Molding Shrinkage, Parallel | Approx. 1.3% | ISO 294-4 |
| Molding Shrinkage, Normal | Approx. 0.9% | ISO 294-4 |
| Color | Black | Manufacturer information |
| Product Form | Pellets / Granules | Manufacturer information |
The density of approximately 0.95 g/cm³ is lower than many traditional rubber compounds and helps reduce component weight.
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Stress at 100% Elongation | 3.14 MPa | ISO 527-1/-2 or ISO 37 |
| Stress at Break | 5.77 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break | 423% | ISO 527-1/-2 or ISO 37 |
| Shear Modulus | 18 MPa | ISO 6721 |
| Tear Strength | 23.2 kN/m | ISO 34-1 |
| Compression Set, 70°C / 24 h | 36% | ISO 815 |
| Compression Set, 125°C / 70 h | 64% | ISO 815 |
These properties provide sufficient flexibility and sealing performance for molded automotive encapsulation while maintaining the strength needed for handling and assembly.
Flow & Surface Performance
Celanese positions Santoprene 121-75M200 as a high-flow appearance grade rather than simply a conventional 75A TPV.
Important grade-specific processing benefits include:
- Fast cavity filling
- Easier molding of complex geometries
- Lower molding-temperature capability
- Lower injection-pressure capability
- Reduced sensitivity to flow direction
- Lower risk of part warpage
- Reduced risk of glass breakage
- Higher molded-surface gloss
- Mold-texture-controlled gloss adjustment
- Reduced visible flow defects
- Reduced tiger-striping appearance
These benefits are particularly important in visible glass-encapsulation applications.
Why Choose Santoprene 121-75M200?
The main reason to choose Santoprene 121-75M200 is its specialization for high-quality injection-molded automotive glass encapsulation.
A conventional TPV may provide suitable hardness and tensile properties but still create processing problems around glass.
High injection pressure can increase stress on the glass. Poor flow can result in incomplete filling. Flow-direction sensitivity may contribute to uneven shrinkage and warpage. Visible flow marks can also reduce the perceived quality of exterior trim.
Santoprene 121-75M200 addresses these issues through its high-flow formulation.
Celanese specifically states that the grade can be molded at lower temperatures or lower injection pressures.
For glass encapsulation, lower injection pressure can help reduce mechanical loading on the glass while still filling long and complex cavities.
Its improved flow also supports thinner sections and intricate perimeter geometries.
Surface appearance is another major selection factor.
Quarter lights and fixed side-glass encapsulation are highly visible from the exterior of a vehicle. A TPV surface with strong flow lines or tiger stripes can create an unacceptable visual effect.
The M200 formulation is designed for superior surface appearance with minimal to no such defects.
High gloss is also useful because the mold surface can be used to tune the final part appearance. This gives toolmakers and designers more control over the desired finish.
UV resistance further supports exterior vehicle use, helping the black sealing section withstand sunlight exposure.
The grade’s 423% elongation and Shore A 76 hardness provide a useful combination of flexibility and support around the glass perimeter.
For automotive glazing applications where flow, appearance, UV stability and molding reliability are more important than simply maximizing low compression set, Santoprene 121-75M200 is a highly targeted TPV choice.
Processing Guidelines for Santoprene 121-75M200
Santoprene 121-75M200 is primarily optimized for:
- Injection molding
- Multi-injection molding
- Automotive glass encapsulation
- Complex-geometry molding
Current Grade-Specific Processing Guidance
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying | Recommended |
| Drying Temperature | 80°C |
| Drying Time | Approx. 3 hours |
| Optimum Melt Temperature | 215°C |
| General Santoprene TPV Processing Window | 175–230°C |
Celanese recommends desiccant drying for approximately 3 hours at 80°C before processing.
The current exact-grade datasheet lists an optimum melt temperature around 215°C.
Santoprene TPV has a broad family processing window of approximately 175–230°C.
High-Flow Injection Molding
The grade is designed for:
- Lower injection pressures
- Lower molding temperatures where appropriate
- Fast cavity filling
- Complex part geometries
- Superior visible surface finish
- Reduced flow defects
Because Santoprene 121-75M200 is strongly shear dependent, increasing shear through appropriate gate design and injection speed can reduce apparent melt viscosity.
This behavior is particularly useful in long-flow automotive glazing tools.
Process Optimization
For production trials, evaluate:
- Melt temperature
- Mold temperature
- Injection speed
- Screw speed
- Back pressure
- Gate location
- Gate size
- Flow length
- Cavity pressure
- Venting
- Cooling time
- Shrinkage
- Warpage
- Glass stress
- Gloss
- Tiger-striping tendency
For encapsulation, process conditions should be balanced to achieve complete fill without applying unnecessary pressure to the glass.
Material Compatibility
Celanese states that Santoprene TPV is incompatible with acetal (POM) and PVC.
Processing equipment should be properly purged before switching between those polymers and Santoprene 121-75M200.
Santoprene 121-75M200 vs. Santoprene 121-75M100
Both grades are black, high-flow Santoprene TPV materials used in automotive applications, but their property balance is different.
| Feature | Santoprene 121-75M200 | Santoprene 121-75M100 |
|---|---|---|
| Material Family | TPV | TPV |
| Color | Black | Black |
| Core Positioning | High-flow glass encapsulation / superior appearance | Improved-flow automotive TPV |
| Shore A Hardness | 76 | Approx. 80 |
| Elongation at Break | 423% | Approx. 441% |
| Stress at Break | 5.77 MPa | Approx. 6.6 MPa |
| Stress @ 100% Elongation | 3.14 MPa | Approx. 3.8 MPa |
| Compression Set, 70°C | 36% | Approx. 42% |
| Key Selection Advantage | Best flow / appearance emphasis | Slightly firmer mechanical response |
Choose Santoprene 121-75M200 when high flow, glass encapsulation, surface appearance and lower-pressure molding are key priorities.
Choose Santoprene 121-75M100 when a slightly harder black improved-flow TPV is preferred.
Automotive OEM References
Current grade-level Celanese data for Santoprene 121-75M200 lists the following specification references:
| OEM | Specification / Reference |
|---|---|
| Mercedes-Benz Group | DBL 5562 |
| General Motors | GMW15812, Type 7M |
| Geely | Q/JLY J7110166B |
| Li Auto | Q/LiA5310057 |
These references strengthen the grade’s positioning for automotive glazing and exterior sealing systems.
Related Products
Santoprene 121-75M100 – Black improved-flow TPV with slightly higher hardness for automotive molding applications.
Santoprene 121-60M200 – Softer black improved-flow TPV with approximately Shore A 61 hardness.
Santoprene 121-55W241 – Black improved-flow TPV used in glass encapsulation where a softer hardness level is required.
Santoprene 121-70M350 – Black improved-flow TPV with improved abrasion resistance for automotive interior applications.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 121-75M200
| Document Type | Description |
|---|---|
| TDS | Current Celanese physical, mechanical and processing data |
| SDS | Safety Data Sheet |
| Automotive Grade Information | Glass-encapsulation and OEM positioning |
| OEM Specification Information | Mercedes-Benz, GM, Geely and Li Auto references |
| Santoprene Product Finder | Celanese TPV grade comparison |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 121-75M200
Q1: What is Santoprene 121-75M200?
Santoprene 121-75M200 is a black UV-resistant high-flow TPV from Celanese designed especially for automotive glass encapsulation and other difficult injection-molding applications.
Q2: What is the hardness of Santoprene 121-75M200?
The current Shore A hardness is approximately 76.
Q3: What is the main application?
Its strongest application is automotive glass encapsulation, including quarter lights, fixed side glass, weather seals and visible molded glazing components.
Q4: Why is Santoprene 121-75M200 suitable for glass encapsulation?
It is designed for high flow, lower-pressure molding, good cavity filling and excellent surface appearance, helping reduce molding stress and visible flow defects.
Q5: What is the elongation at break?
Current Celanese data lists approximately 423% elongation at break.
Q6: What is the tensile stress at break?
The current value is approximately 5.77 MPa.
Q7: Is Santoprene 121-75M200 UV resistant?
Yes. Celanese identifies the grade as a black UV-resistant TPV suitable for exterior automotive use.
Q8: What is the compression set?
Current data lists approximately 36% at 70°C / 24 h and 64% at 125°C / 70 h.
Q9: What processing temperature is recommended?
The current exact-grade data gives an optimum melt temperature of approximately 215°C. The broader Santoprene TPV processing window is approximately 175–230°C.
Q10: What is the difference between Santoprene 121-75M200 and 121-75M100?
Both are black improved-flow TPV grades. 121-75M200 is particularly focused on superior flow, glass encapsulation and surface appearance, while 121-75M100 provides a slightly firmer mechanical profile.
Request Santoprene 121-75M200 Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 121-75M200, please provide:
- Required quantity
- Destination country or port
- Automotive glass-encapsulation application
- Quarter light, side fixed glass, gasket or other part
- Required Shore hardness
- Part geometry and flow length
- Required gloss / surface finish
- Mold texture
- Injection pressure limitations
- Glass dimensions and encapsulation design
- Outdoor / UV exposure
- OEM specification requirement
- TDS, SDS or COA requirement
- Sample requirement, if applicable
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