描述
Santoprene 201-55 is a soft, natural-color, colorable thermoplastic vulcanizate (TPV) from Celanese designed for broad general-purpose extrusion and molding applications.
It belongs to the Santoprene 200-series family, which provides colorable alternatives to the black 100-series general-purpose grades while retaining the characteristic rubber-like performance of Santoprene TPV.
Celanese describes Santoprene 201-55 as a soft, colorable and versatile TPV in the thermoplastic elastomer family. The material combines good physical properties and chemical resistance for use across a wide range of technical applications.
The grade is polyolefin based and exhibits the shear-dependent flow behavior typical of Santoprene TPV. Its apparent melt viscosity decreases as shear rate increases, allowing the material to process efficiently on conventional thermoplastic injection-molding and extrusion equipment when the process is correctly optimized.
The current Shore A hardness is approximately 59, placing Santoprene 201-55 in the soft elastomer range.
Current Celanese data lists a tensile stress at 100% elongation of approximately 2.1 MPa, tensile stress at break of approximately 5.2 MPa, elongation at break of approximately 400%, and tear strength of approximately 16 kN/m.
These values give the grade a practical balance of flexibility, elasticity and mechanical strength for seals, gaskets, flexible molded parts and extruded profiles.
Celanese also highlights excellent flex-fatigue resistance and excellent ozone resistance as key performance features.
Flex-fatigue resistance is important for parts that bend, compress or move repeatedly during service. Ozone resistance supports long-term use in outdoor, automotive and industrial environments where elastomer cracking could otherwise become a concern.
Low-temperature performance is another strength of Santoprene 201-55. The current brittleness temperature is approximately -60°C, supporting use in cold-weather applications.
Compression set is approximately 22% at 70°C for 24 hours and approximately 38% at 125°C for 70 hours.
These values are particularly relevant to seals and gaskets because lower compression set helps a material recover after prolonged deformation and maintain sealing force.
The current Celanese data also lists a continuous upper temperature resistance of 135°C for 1,000 hours under SAE J2236.
UL Relative Thermal Index values are approximately 100°C for electrical use at 1.5 and 3.0 mm, 90°C for mechanical-strength use at 1.5 mm, and 100°C for mechanical-strength use at 3.0 mm.
Santoprene 201-55 is UL recognized under Celanese references QMFZ2.E80017 and QMFZ8.E80017.
Current data also lists detergent-resistance classifications of f3 under UL 749 and f4 under UL 2157.
For customers requiring colored elastomeric components, the natural base color is an important difference from black grades such as Santoprene 101-55. Masterbatch or pigment systems can be used where compatible with the TPV and the required application specification.
The material is also recyclable within the manufacturing stream, subject to process control and end-use requirements.
For more TPV materials, visit our TPV Thermoplastic Vulcanizates Product Category →.
For the current Celanese TPV portfolio, see the Official Celanese Santoprene & Geolast Product Finder →.
Key Features of Santoprene 201-55
| Feature | Engineering Benefit |
|---|---|
| Natural / Colorable | Suitable for applications requiring custom colors rather than black |
| Shore A 59 | Soft elastomeric feel for seals, gaskets and flexible parts |
| Excellent Flex-Fatigue Resistance | Supports repeated bending and cyclic deformation |
| Excellent Ozone Resistance | Useful for automotive, outdoor and industrial service |
| -60°C Brittleness Temperature | Maintains useful low-temperature flexibility |
| 400% Elongation at Break | Allows substantial deformation before failure |
| 5.2 MPa Stress at Break | Provides useful strength for a soft TPV |
| 16 kN/m Tear Strength | Supports durable molded and extruded components |
| Low Compression Set | Helps seals retain force after extended compression |
| Good Chemical Resistance | Suitable for many general industrial environments |
| Injection Molding + Extrusion | Compatible with conventional thermoplastic processing |
| UL Recognized | Current Celanese documentation references E80017 |
| Manufacturing-Stream Recyclability | Supports controlled reuse of suitable process scrap |
| Automotive OEM References | Current grade data lists multiple major OEM specifications |
Typical Applications for Santoprene 201-55
Santoprene 201-55 is a general-purpose TPV suitable for many automotive, industrial, appliance and consumer applications.
| Application Area | Typical Use |
|---|---|
| Seals & Gaskets | Soft static and dynamic sealing components |
| Automotive Components | Flexible molded parts, gaskets, plugs and protective parts |
| Bellows & Flexible Covers | Components exposed to repeated bending |
| Grommets & Plugs | Soft protective and sealing parts |
| Flexible Profiles | Extruded seals and edge profiles |
| Appliance Components | Flexible molded and extruded components |
| Tubing | Flexible technical tubing in compatible environments |
| Electrical Protection Parts | Elastomeric boots, covers and insulating components |
| Consumer Products | Soft components requiring custom coloration |
| Coextruded Profiles | Soft TPV sections combined with compatible substrates |
Typical Properties of Santoprene 201-55
Physical & Rheological Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 970 kg/m³ / 0.970 g/cm³ | ISO 1183 |
| Shore A Hardness, 15 s | 59 | ISO 48-4 / ISO 868 |
| Molding Shrinkage – Parallel | 3.7% | ISO 294-4 / 2577 |
| Molding Shrinkage – Normal | 0.9% | ISO 294-4 / 2577 |
| Resin Identification | TPV | ISO 1043 |
| Part Marking Code | >TPV< | ISO 11469 |
| Product Form | Pellets | Manufacturer information |
| Appearance | Natural / Colorable | Manufacturer information |
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile Stress at 100% Elongation | 2.1 MPa | ISO 37 |
| Tensile Stress at Break | 5.2 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break | 400% | ISO 527-1/-2 or ISO 37 |
| Tear Strength | 16 kN/m | ISO 34-1 |
| Brittleness Temperature | -60°C | ISO 974 / ASTM D746 |
| Compression Set, 70°C / 24 h | 22% | ISO 815 |
| Compression Set, 125°C / 70 h | 38% | ISO 815 |
Thermal & Aging Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Continuous Upper Temperature Resistance, 1000 h | 135°C | SAE J2236 |
| RTI Electrical, 1.5 mm | 100°C | UL 746B |
| RTI Electrical, 3.0 mm | 100°C | UL 746B |
| RTI Strength, 1.5 mm | 90°C | UL 746B |
| RTI Strength, 3.0 mm | 100°C | UL 746B |
| Tensile Strength Change, 150°C / 168 h | -7% | ISO 188 |
| Tensile Strain-at-Break Change, 150°C / 168 h | +13% | ISO 188 |
| Shore A Hardness Change, 150°C / 168 h | +3 | ISO 188 |
Flammability & Electrical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Burning Behavior @ 1.5 mm | HB | IEC 60695-11-10 |
| Burning Behavior @ 1.0 mm | HB | IEC 60695-11-10 |
| UL Recognition | Yes | UL 94 |
| FMVSS Classification | Class B | ISO 3795 / FMVSS 302 |
| Burning Rate @ 2 mm | 29.6 mm/min | ISO 3795 / FMVSS 302 |
| Relative Permittivity @ 60 Hz | 2.3 | IEC 62631-2-1 |
| Comparative Tracking Index | PLC 0 | UL 746A |
| Arc Resistance Category | PLC 6 | UL 746B |
| High-Amperage Arc Ignition @ 1.5 mm | PLC 0 | UL 746A |
Detergent Resistance
| Property | Rating | Standard |
|---|---|---|
| Detergent Resistance | f3 | UL 749 |
| Detergent Resistance | f4 | UL 2157 |
Automotive OEM References for Santoprene 201-55
| OEM | Specification / Reference |
|---|---|
| Ford | WSD-M2D378-A1 |
| General Motors | GMW15813P-TPV-(EPDM+PP)-Type 4 |
| Mercedes-Benz | DBL 5562 |
| Stellantis / Chrysler | MS-AR-100 AGN Natural |
| Volkswagen Group | VW 50123 |
Why Choose Santoprene 201-55?
The main reason to choose Santoprene 201-55 is its combination of general-purpose Santoprene elastomeric performance and natural colorability.
Many standard TPV grades are supplied in black. That is suitable for a large number of automotive and industrial applications, but it limits designers who need gray, blue, red, beige or another custom color.
The natural base of Santoprene 201-55 gives processors greater flexibility when appearance or color coding matters.
At the same time, the material maintains the fundamental mechanical properties expected from a soft Santoprene TPV.
Its Shore A 59 hardness supports seals and gaskets that need a compliant surface. The 400% elongation at break provides substantial deformability. Excellent flex-fatigue resistance is useful for parts that repeatedly bend or compress, while excellent ozone resistance supports outdoor and automotive service.
The -60°C brittleness temperature helps maintain low-temperature flexibility in cold climates.
The compression-set values of 22% at 70°C / 24 hours and 38% at 125°C / 70 hours provide useful sealing performance for many technical applications.
The material is also processable by injection molding, multi-injection molding, extrusion, sheet extrusion and coextrusion.
For customers who need a soft natural TPV that can be custom colored while retaining proven Santoprene performance, Santoprene 201-55 is a core grade to evaluate.
Processing Guidelines for Santoprene 201-55
Santoprene 201-55 supports:
- Injection molding
- Multi-injection molding
- Extrusion
- Sheet extrusion
- Coextrusion
Grade-Specific Injection Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying | Recommended |
| Drying Temperature | 80°C |
| Drying Time | ≥3 hours in a dehumidified dryer |
| Processing Moisture Content | ≤0.08% |
| Maximum Regrind Level | 20% |
| Optimum Melt Temperature | 200°C |
| Minimum Melt Temperature | 185°C |
| Maximum Melt Temperature | 220°C |
| Optimum Mold Temperature | 30°C |
| Minimum Mold Temperature | 10°C |
| Maximum Mold Temperature | 50°C |
| Recommended Screw Speed | 100–200 rpm |
| Holding Pressure | Approx. 50–75% of actual injection pressure |
| Optional Back Pressure | Approx. 0.3–0.7 MPa |
Extrusion Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying Temperature | 82°C |
| Drying Time | 3 hours |
| Melt Temperature Reference | 196°C |
Celanese also gives a broad Santoprene TPV processing window of approximately 175–230°C.
Shear-Dependent Flow Behavior
Santoprene 201-55 has relatively high melt viscosity at low shear rates. As shear rate increases, apparent viscosity decreases.
This means:
- Higher shear can improve flow
- Smaller gates can increase shear and reduce apparent viscosity
- Higher screw speed can improve melt homogeneity
- Increasing temperature alone has a smaller effect on melt viscosity than increasing shear
- Gate and die design are important to part quality
Color Masterbatch Processing
Because Santoprene 201-55 is a natural, colorable grade, masterbatch selection can become an important processing variable.
The color system should be compatible with TPV processing conditions and should not interfere with mechanical properties, hardness, UV performance, chemical resistance, OEM requirements, UL requirements or surface appearance.
Celanese notes that higher back pressure may be useful when processing masterbatch to improve melt homogeneity.
Material Compatibility
Santoprene TPV is incompatible with acetal (POM) and PVC.
When changing materials, barrels, screws, hot runners and extrusion equipment should be thoroughly purged to avoid contamination.
Santoprene 201-55 vs. Santoprene 101-55
| Feature | Santoprene 201-55 | Santoprene 101-55 |
|---|---|---|
| Material Family | TPV | TPV |
| Product Positioning | General purpose | General purpose |
| Appearance | Natural / Colorable | Black |
| Shore A Hardness | 59 | Approx. 60 |
| Elongation at Break | 400% | Approx. 420% |
| Tensile Stress at Break | 5.2 MPa | Approx. 5.0 MPa |
| Tensile Stress @ 100% Elongation | 2.1 MPa | Approx. 1.9 MPa |
| Brittleness Temperature | -60°C | -60°C |
| Main Selection Difference | Natural base for custom colors | Standard black appearance |
Related Products
Santoprene 201-64 – Natural colorable general-purpose TPV with approximately Shore A 69 hardness.
Santoprene 201-73 – Natural colorable general-purpose TPV with approximately Shore A 78 hardness.
Santoprene 101-55 – Black general-purpose TPV with similar softness for applications where custom coloration is not required.
View More TPV Thermoplastic Vulcanizates →
Technical Documents for Santoprene 201-55
| Document Type | Description |
|---|---|
| TDS | Current Celanese physical, mechanical, thermal, electrical and processing data |
| SDS | Safety Data Sheet |
| UL Information | QMFZ2.E80017 / QMFZ8.E80017 recognition |
| Automotive Specification Information | Ford, GM, Mercedes-Benz, Stellantis and VW references |
| Santoprene Product Finder | Celanese TPV grade comparison and positioning |
| Processing Guide | Injection molding and extrusion guidance |
| COA | Batch-specific quality information where available |
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FAQ About Santoprene 201-55
Q1: What is Santoprene 201-55?
Santoprene 201-55 is a soft, natural and colorable general-purpose TPV from Celanese with approximately Shore A 59 hardness.
Q2: Is Santoprene 201-55 natural or black?
It is a natural / colorable grade, making it useful where custom coloration is required.
Q3: What is the hardness of Santoprene 201-55?
The current Celanese value is approximately Shore A 59.
Q4: What is the elongation at break?
Current grade data lists approximately 400% elongation at break.
Q5: What is the tensile stress at break?
The current value is approximately 5.2 MPa.
Q6: What is the low-temperature performance?
The current brittleness temperature is approximately -60°C.
Q7: What is the compression set?
Current values are approximately 22% at 70°C / 24 h and 38% at 125°C / 70 h.
Q8: Can Santoprene 201-55 be injection molded and extruded?
Yes. Celanese lists injection molding, multi-injection molding, extrusion, sheet extrusion and coextrusion.
Q9: What processing temperature should be used?
The grade-specific injection range is approximately 185–220°C, with an optimum melt temperature around 200°C. The current extrusion melt-temperature reference is approximately 196°C.
Q10: What is the difference between Santoprene 201-55 and 101-55?
Both are soft general-purpose TPV grades. Santoprene 201-55 is natural and colorable, while Santoprene 101-55 is supplied in black.
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