描述
Santoprene 121-65M300 is a soft, black, UV-stabilized thermoplastic vulcanizate from Celanese developed specifically for automotive interior applications that require low fogging, low odor, easy injection molding and good visible-part appearance.
This grade is not simply a standard Shore A 65 TPV. Its main value is the combination of a softer elastomeric feel with improved flow and low-volatility behavior, making it especially useful for interior parts where surface quality, emissions and processing efficiency matter at the same time.
Celanese describes Santoprene 121-65M300 as a material designed for fast and easy injection molding, especially for complex part geometries. It is also recommended when the finished component requires superior surface appearance.
The material is designed to be molded at lower injection pressures or lower molding temperatures than more conventional TPV grades. This can be useful for thin-wall parts, complex cavities, appearance-sensitive interior trim components and tooling where easier filling is desirable.
Another defining characteristic of Santoprene 121-65M300 is its suitability for automotive interior environments requiring low fogging and low odor.
Fogging refers to the condensation of volatile substances on glass or other interior surfaces. In automotive cabins, excessive volatile emissions can be undesirable because they may contribute to windshield haze, odor or poor perceived interior quality.
Celanese’s product finder summarizes the grade as offering improved flow for easier processability and low volatiles, which aligns directly with its interior-use positioning.
The grade is black and UV stabilized. This improves its suitability for vehicle interiors where parts may be exposed to sunlight through windows over extended periods.
At the same time, Santoprene 121-65M300 maintains the elastic behavior expected from Santoprene TPV.
Current Celanese material data lists approximately Shore A 65 hardness, 490% elongation at break, 6.6 MPa tensile stress at break, and 2.3 MPa tensile stress at 100% elongation.
This property balance provides softness and flexibility while still giving the material useful mechanical strength for sealing, trim interfaces and molded elastomeric components.
Its density is approximately 0.920 g/cm³, which is lower than many elastomer systems and can help reduce component weight.
Low-temperature performance is also relevant. The current brittleness temperature is approximately -52°C, supporting interior applications across a wide range of vehicle climates.
The material can be processed on conventional thermoplastics injection-molding equipment. Celanese currently lists Injection Moulding and Multi Injection Moulding for this grade.
Because the material is polyolefin based, Celanese also states that it is recyclable within the manufacturing stream.
For more TPV materials, visit our TPV Thermoplastic Vulcanizates Product Category →.
For Celanese’s current Santoprene portfolio and grade positioning, see the Official Celanese Santoprene & Geolast TPV Product Finder →.
Key Features of Santoprene 121-65M300
| Feature | Engineering Benefit |
|---|---|
| Shore A 65 | Soft elastomeric feel for seals, interfaces and interior trim components |
| Low Fogging | Supports cleaner automotive interior glass and appearance-sensitive cabins |
| Low Odor | Suitable for vehicle interior environments where perceived quality matters |
| Low Volatiles | Helps reduce interior-emission concerns |
| High Flow | Easier filling of complex or thin-wall molded geometries |
| Lower Injection Pressure Capability | Can reduce filling pressure in challenging tools |
| Lower Molding Temperature Capability | Supports efficient molding and may reduce thermal exposure |
| Superior Surface Appearance | Useful for visible automotive interior components |
| UV Stabilized | Improved durability for sunlight-exposed interior parts |
| 490% Elongation at Break | High flexibility for sealing and deformable components |
| 6.6 MPa Tensile Stress at Break | Useful mechanical strength for a soft TPV |
| -52°C Brittleness Temperature | Supports cold-climate vehicle service |
| Injection Molding | Designed for conventional thermoplastic molding equipment |
| Multi-Injection Molding | Supports integrated soft-component designs |
The core advantage of Santoprene 121-65M300 is therefore not only hardness. It is the combination of high flow, low volatiles, low fogging, low odor, UV resistance and strong part appearance.
Typical Applications for Santoprene 121-65M300
Santoprene 121-65M300 is targeted mainly at automotive interior applications.
| Application Area | Typical Use |
|---|---|
| Interior Seals | Soft sealing elements around trim and cabin interfaces |
| Instrument-Panel Seals | Flexible seals between rigid interior components |
| HVAC Sealing Components | Soft interfaces, flaps, seals and air-management parts |
| Console Components | Flexible appearance-sensitive molded elements |
| Interior Gaskets | Soft sealing parts requiring low odor and low fogging |
| Decorative Interface Parts | Flexible visible components requiring good surface quality |
| Door-Trim Seals | Interior trim sealing and vibration-control parts |
| Noise / Vibration Isolation Components | Soft TPV elements used for damping and isolation |
| Complex Injection-Molded Parts | High-flow molded parts with thin or complex geometries |
| Multi-Material Interior Parts | Soft TPV sections produced by multi-injection molding |
The strongest application fit is where low interior emissions, appearance and easy molding are more important than the very lowest compression set available in the Santoprene family.
Typical Properties of Santoprene 121-65M300
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 920 kg/m³ / 0.920 g/cm³ | ISO 1183 |
| Shore A Hardness, 15 s | 65 | 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 |
The relatively low density of 0.920 g/cm³ can contribute to lightweight interior components while maintaining rubber-like behavior.
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile Stress at 100% Elongation, Perpendicular | 2.3 MPa | ISO 37 |
| Tensile Stress at Break, Perpendicular | 6.6 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break, Perpendicular | 490% | ISO 527-1/-2 or ISO 37 |
| Brittleness Temperature | -52°C | ASTM D746 |
| Low-Temperature Brittleness | -52°C | ISO 812 |
| Compression Set, 70°C / 24 h | 41% | ISO 815 |
The mechanical data show that Santoprene 121-65M300 remains highly flexible even though the grade is optimized for flow and interior appearance.
Heat-Aging Performance
Current Celanese grade data also includes heat-aging information at 100°C for 1008 hours:
| Property Change | Typical Value | Test Method |
|---|---|---|
| Tensile Strength Change | -3% | ISO 188 |
| Tensile Strain at Break Change | -10% | ISO 188 |
| Shore A Hardness Change | +2 | ISO 188 |
These values are useful when evaluating long-term interior temperature exposure.
The relatively small changes in tensile strength and hardness indicate that the material can retain useful elastomeric behavior after prolonged elevated-temperature aging.
Flammability
| Property | Typical Value | Test Method |
|---|---|---|
| FMVSS Classification | Class B | ISO 3795 / FMVSS 302 |
| Burning Rate @ 2 mm | 43.9 mm/min | ISO 3795 / FMVSS 302 |
This FMVSS-related data is particularly relevant to automotive interior material selection.
Low Fogging, Low Odor & Low Volatiles
One of the main reasons to specify Santoprene 121-65M300 is its interior-emission profile.
Celanese specifically identifies the grade for automotive interior applications requiring:
- Low fogging
- Low odor
- Low volatiles
- Good surface appearance
- Improved UV resistance
These features distinguish it from a basic general-purpose Santoprene TPV.
In an automotive cabin, a flexible polymer may be exposed to elevated temperatures for long periods. Volatile constituents can migrate from some polymer systems and potentially condense on cooler surfaces such as glass.
A low-fogging grade helps reduce this risk.
Low odor is also important because vehicle occupants are directly exposed to interior surfaces. A material with a more suitable emissions profile can support stricter cabin-quality requirements.
The low-volatiles positioning of Santoprene 121-65M300 therefore has both engineering and perceived-quality value.
Automotive OEM References for Santoprene 121-65M300
The latest Celanese Materials Database revision available for this grade lists several automotive specification references:
| OEM | Specification / Reference |
|---|---|
| Ford | WSS-M2D510-A6 |
| Geely | Q/JLY J7110166C-2024 |
| Mercedes-Benz | DBL5562 |
| Stellantis / Chrysler | MS-AR-100 BMV2 Black |
| Volkswagen Group | VW 50123 |
| Volkswagen Group | VW 50180 |
An older Celanese database revision also listed GM GMW15816P-TPV Type 5. Because this item is not visible in the latest 2025 revision, current customer projects should use the latest Celanese approval documentation when an OEM specification is contractually required.
This distinction is important for automotive supply chains because OEM approvals and material specifications can be revised over time.
Why Choose Santoprene 121-65M300?
The main reason to choose Santoprene 121-65M300 is that it was engineered around the actual requirements of modern automotive interior parts.
A standard general-purpose TPV may provide the required Shore hardness, but interior applications often demand much more.
The component may need low odor, low fogging, low volatile emissions, good UV resistance, high surface quality, easy filling of complex cavities, lower molding pressure, lower molding temperature and reliable low-temperature flexibility.
Santoprene 121-65M300 addresses these requirements in one specialized grade.
Its Shore A 65 hardness provides a useful balance between softness and support.
The 490% elongation at break allows substantial deformation without brittle failure.
The tensile stress at break of approximately 6.6 MPa provides useful mechanical integrity for molded seals and flexible components.
The -52°C brittleness temperature gives the grade meaningful cold-climate capability.
Its high-flow behavior can also make production easier.
Celanese specifically states that the material is designed for fast, easy injection molding, especially for complex part geometries.
This can be important in interior components with thin sections, small gates, long flow paths or intricate details.
The grade is also designed for lower molding temperatures or lower injection pressures.
Reducing injection pressure can help manage tooling stress, flash risk and filling behavior. Lower temperature capability can help reduce thermal exposure and energy use when the mold and part design allow it.
Surface appearance is another differentiator.
For visible interior components, a material must not only meet mechanical requirements; it must also deliver a consistent surface.
Celanese specifically recommends Santoprene 121-65M300 for applications requiring superior part surface appearance.
For automotive interior suppliers that prioritize appearance, processability and emissions performance, this grade is therefore more targeted than a conventional general-purpose TPV.
Processing Guidelines for Santoprene 121-65M300
Santoprene 121-65M300 is designed primarily for:
- Injection molding
- Multi-injection molding
Grade-Specific Injection Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying | Recommended |
| Drying Temperature | 80°C |
| Drying Time | ≥3 hours in a dehumidified dryer |
| Maximum Processing Moisture | ≤0.08% |
| Optimum Melt Temperature | 190°C |
| Minimum Melt Temperature | 180°C |
| Maximum Melt Temperature | 230°C |
| Optimum Mold Temperature | 35°C |
| Minimum Mold Temperature | 10°C |
| Maximum Mold Temperature | 60°C |
| Screw Speed | 100–200 rpm recommended |
| Holding Pressure | Approx. 50–75% of actual injection pressure |
| Optional Back Pressure | Approx. 0.3–0.7 MPa |
These current grade-specific values should be used as the primary starting point when processing Santoprene 121-65M300.
Celanese also gives a broader Santoprene TPV family processing window of approximately 175–230°C.
Drying
Desiccant drying for at least 3 hours at 80°C is recommended.
The target processing moisture is ≤0.08%.
Controlling moisture supports stable molding behavior, surface quality and repeatability.
High-Flow, Shear-Dependent Processing
Santoprene TPV has relatively high melt viscosity at low shear rates.
As shear rate increases, apparent viscosity falls.
This is particularly relevant to Santoprene 121-65M300, because high-flow behavior is one of the grade’s defining advantages.
Celanese notes that high screw speed can support homogeneous melt preparation, smaller gates can generate higher shear, higher shear lowers apparent melt viscosity, higher shear can improve mold filling, and increasing temperature alone has relatively little effect on TPV viscosity compared with changing shear rate.
For appearance-critical automotive parts, processors should optimize gate design, shear rate, injection speed and venting rather than relying only on higher melt temperature.
Holding Pressure
Celanese recommends a holding pressure of approximately 50–75% of actual injection pressure.
The optimum setting depends on part thickness, gate freeze time, shrinkage, sink-mark requirements and appearance.
Back Pressure
Back pressure is not always required.
However, Celanese states that approximately 0.3–0.7 MPa can be used to improve melt homogeneity and maintain a consistent shot size.
Higher back pressure may be used when processing masterbatch systems.
Material Compatibility
Celanese states that Santoprene TPV is incompatible with acetal (POM) and PVC.
When changing materials, the barrel, screw, hot runner and other melt-contact surfaces should be properly purged.
Santoprene 121-65M300 vs. Santoprene 121-60M200
| Feature | Santoprene 121-65M300 | Santoprene 121-60M200 |
|---|---|---|
| Color | Black | Black |
| Shore A Hardness | 65 | Approx. 61 |
| Elongation at Break | 490% | Approx. 379% |
| Tensile Stress at Break | 6.6 MPa | Approx. 4.1 MPa |
| Tensile Stress @ 100% | 2.3 MPa | Approx. 2.0 MPa |
| Compression Set @ 70°C | 41% | Approx. 28% |
| Process Positioning | Improved flow + low volatiles | Improved flow for easier processing |
| Interior Positioning | Low fogging / low odor / superior surface appearance | General high-flow black TPV |
| Best Selection Reason | Appearance-critical automotive interiors | General high-flow molded applications |
The comparison shows that Santoprene 121-65M300 is not designed simply to minimize compression set. Its stronger positioning is automotive interior quality, low emissions and appearance.
Santoprene 121-60M200 may be more attractive where lower compression set and softer hardness are more important.
Related Products
Santoprene 121-60M200 – Black high-flow TPV with Shore A around 61, intended for easier molding and broad automotive use.
Santoprene 121-80M300 – Higher-hardness black M300-series grade with improved flow and low-volatiles positioning.
Santoprene 121-70M350 – Black high-flow TPV with improved abrasion resistance for automotive applications.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 121-65M300
| Document Type | Description |
|---|---|
| TDS | Current Celanese mechanical, flammability and injection-processing data |
| SDS | Safety Data Sheet |
| OEM Specification Information | Current automotive references including Ford, Geely, Mercedes-Benz, Stellantis and VW |
| Santoprene Product Finder | Grade comparison and application positioning |
| Injection Molding Guide | Shear, gate, temperature and pressure guidance |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 121-65M300
Q1: What is Santoprene 121-65M300?
Santoprene 121-65M300 is a black UV-stabilized high-flow TPV from Celanese designed primarily for automotive interior applications requiring low fogging, low odor and good surface appearance.
Q2: What is the hardness of Santoprene 121-65M300?
The current Celanese value is approximately Shore A 65.
Q3: Is Santoprene 121-65M300 a low-fogging grade?
Yes. Celanese specifically positions the material for automotive interiors requiring low fogging and low odor.
Q4: What does M300 mean in this grade?
Within Celanese’s Santoprene portfolio, M300 grades are associated with improved flow and low-volatiles performance, particularly for appearance-sensitive automotive molding applications.
Q5: What is the elongation at break?
Current Celanese data lists approximately 490% elongation at break.
Q6: What is the tensile stress at break?
The current value is approximately 6.6 MPa.
Q7: What is the low-temperature capability?
The current brittleness temperature is approximately -52°C.
Q8: What is the recommended injection-molding temperature?
Current grade-specific data lists 180–230°C, with an optimum around 190°C.
Q9: Does Santoprene 121-65M300 require drying?
Yes. Celanese recommends drying at approximately 80°C for at least 3 hours and controlling processing moisture to ≤0.08%.
Q10: What is the main difference between Santoprene 121-65M300 and 121-60M200?
Santoprene 121-65M300 is more specifically optimized for automotive interior applications requiring low fogging, low odor, low volatiles and superior surface appearance, while 121-60M200 is a more general improved-flow grade.
Request Santoprene 121-65M300 Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 121-65M300, please provide:
- Required quantity
- Destination country or port
- Automotive interior application
- Seal, gasket, trim interface or molded-part design
- Required Shore hardness
- Low-fogging requirement
- Low-odor requirement
- OEM specification requirement
- Surface-appearance requirement
- Part thickness and flow length
- Gate type and mold configuration
- Injection pressure or temperature limitations
- UV exposure
- Operating-temperature range
- Required TDS, SDS or COA
- Sample requirement, if applicable
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