描述
Santoprene 251-92W232 is a hard, natural and colorable flame-retardant thermoplastic vulcanizate from Celanese developed for applications requiring high elastomeric hardness together with UL 94 vertical-flame performance.
The grade belongs to the Santoprene flame-retardant TPV family and is positioned for electrical, wire-and-cable, industrial and technical applications. Celanese describes it as having good fluid resistance and as containing non-ether brominated flame retardants without metal deactivators.
Its current typical mechanical values include:
- 98 Shore A hardness
- 630% elongation at break
- 13.9 MPa tensile stress at break
- 7.2 MPa tensile stress at 100% elongation
- 94 MPa shear modulus
This is a particularly strong combination because the grade remains highly extensible despite its very high Shore A hardness.
Santoprene 251-92W232 is also recommended for applications requiring:
- Flame retardancy
- Excellent flex-fatigue resistance
- Excellent ozone resistance
- Good fluid resistance
Current Celanese processing data lists injection molding, multi-injection molding, extrusion, sheet extrusion, coextrusion, blow molding and thermoforming.
For more TPV products, visit our TPV Thermoplastic Vulcanizates Product Category →.
For the current Santoprene portfolio, see the Official Celanese Santoprene & Geolast Product Finder →.
Key Features of Santoprene 251-92W232
| Feature | Engineering Benefit |
|---|---|
| 98 Shore A Hardness | Provides very firm elastomeric support |
| UL 94 V-0 | Supports flame-retardant electrical and technical applications |
| 630% Elongation at Break | Maintains very high deformation capability |
| 13.9 MPa Tensile Stress at Break | Provides strong mechanical performance |
| 7.2 MPa Stress at 100% Elongation | Provides high resistance to deformation |
| 94 MPa Shear Modulus | Reflects high stiffness within the Shore A TPV range |
| Good Fluid Resistance | Useful in automotive and industrial environments |
| Excellent Flex-Fatigue Resistance | Supports components exposed to repeated movement |
| Excellent Ozone Resistance | Supports long-term outdoor and industrial durability |
| Natural / Colorable | Allows customized product colors |
| Wire & Cable UL Recognition | Listed in polymeric-material wire-and-cable category |
| Injection Moldable | Suitable for molded connectors and technical parts |
| Extrudable / Coextrudable | Suitable for cable, sheet and profile applications |
| Blow Moldable | Supports selected hollow components |
| Thermoformable | Broadens manufacturing flexibility |
The strongest reason to select Santoprene 251-92W232 is its combination of very high hardness, high tensile strength, excellent elongation and V-0 flame-retardant performance.
Typical Applications for Santoprene 251-92W232
Santoprene 251-92W232 is especially suitable for technical components requiring more stiffness than softer TPV grades while retaining elastomeric flexibility.
| Application Area | Typical Use |
|---|---|
| Wire & Cable Components | Flame-retardant protective components |
| Cable Boots | Firm flexible cable protection |
| Strain Reliefs | High-strength molded cable-support parts |
| Electrical Connectors | Firm elastomeric connector housings and seals |
| Grommets | Electrical and mechanical protection |
| Flexible Housings | Flame-retardant electrical protection |
| Automotive Electrical Parts | Connectors, boots and protective components |
| Industrial Electrical Equipment | Tough flexible flame-retardant parts |
| Telecommunications Equipment | Flexible protective components |
| Appliance Components | Flame-retardant technical elastomeric parts |
| Extruded Profiles | High-hardness flame-retardant profiles |
| Sheet Components | Flexible flame-retardant technical sheets |
Celanese’s current Product Finder lists 251-92W232 within its flame-retardant TPV family and gives it the highest hardness among the W232 grades shown there.
Typical Properties of Santoprene 251-92W232
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 1290 kg/m³ / 1.290 g/cm³ | ISO 1183 |
| Shore A Hardness, 15 s | 98 | ISO 48-4 / ISO 868 |
| Product Form | Pellets | Manufacturer information |
| Appearance | Natural / Colorable | Manufacturer information |
| Material Family | TPV | Manufacturer information |
The 2025 Celanese Materials Database revision lists density at approximately 1.290 g/cm³.
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile Stress at 100% Elongation | 7.2 MPa | ISO 527-1/-2 or ISO 37 |
| Tensile Stress at Break | 13.9 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break | 630% | ISO 527-1/-2 or ISO 37 |
| Shear Modulus | 94 MPa | ISO 6721 |
| Shore A Hardness | 98 | ISO 48-4 / ISO 868 |
These values show why Santoprene 251-92W232 is useful when a component needs a very firm elastomeric response without giving up high elongation.
Thermal Properties
| Property | Typical Value | Test Method |
|---|---|---|
| RTI Electrical, 1.5 mm | 90°C | UL 746B |
| RTI Strength, 1.5 mm | 85°C | UL 746B |
| RTI Strength, 3.0 mm | 90°C | UL 746B |
These UL Relative Thermal Index values provide useful guidance for electrical components and cable-related applications.
Flame Retardant Performance
Flame resistance is the primary technical differentiator of Santoprene 251-92W232.
UL 94 & Flammability
| Property | Typical Value | Standard |
|---|---|---|
| UL 94 @ 1.5 mm | V-0 | UL 94 |
| UL 94 @ 3.0 mm | V-0 | UL 94 |
| Oxygen Index | 26% | ISO 4589-1/-2 |
| Hot Wire Ignition, 1.5 mm | PLC 3 | UL 746A |
| UL Recognition | Yes | UL 94 |
The older grade-specific sheet lists V-0 at both 1.5 mm and 3.0 mm, while the 2023 Celanese Materials Database summary explicitly reports V-0 at 3 mm.
For your website page, writing UL 94 V-0 is supported; when thickness is important, use the grade-specific table above rather than omitting thickness context.
Electrical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Electric Strength, 2 mm | 31 kV/mm | ASTM D149 |
| Comparative Tracking Index | PLC 0 | UL 746A |
| Arc Resistance Performance Level | PLC 6 | UL 746B |
| High-Amperage Arc Ignition, 1.5 mm | PLC 0 | UL 746A |
| High-Voltage Arc Tracking Rate | PLC 2 | UL 746A |
These properties make Santoprene 251-92W232 relevant to flexible insulating and protective electrical applications.
UL Recognition
Current Celanese data lists the following UL files for Santoprene 251-92W232:
- QMFZ2.E80017 – Plastics – Component
- QMFZ8.E80017 – Plastics Certified for Canada – Component
- QMTT2.E86313 – Polymeric Materials for Use in Wire, Cable and Flexible Lighting Products – Component
This makes the grade particularly relevant for customers developing flexible electrical, wire-and-cable and connector components.
Flame-Retardant Formulation
Santoprene 251-92W232 contains non-ether brominated flame retardants.
Celanese also explicitly states that the material does not contain metal deactivators.
So for this grade, the W232 designation should be positioned around:
- Flame retardancy
- Electrical applications
- Wire-and-cable suitability
- Flex-fatigue resistance
- Ozone resistance
It should not be described as a W236-style copper-stabilized potable-water grade.
Flex-Fatigue & Ozone Resistance
Celanese specifically recommends Santoprene 251-92W232 for applications requiring excellent flex-fatigue resistance and excellent ozone resistance.
These properties are important for components exposed to:
- Cable movement
- Repeated bending
- Twisting
- Vibration
- Compression
- Environmental aging
High flex-fatigue resistance is especially useful in cable boots, strain reliefs, grommets and moving electrical assemblies.
Why Choose Santoprene 251-92W232?
The main reason to choose Santoprene 251-92W232 is its unusually strong combination of high hardness and high elongation.
At approximately 98 Shore A, the material is one of the firmest grades in the Santoprene W232 flame-retardant family.
Despite this high hardness, elongation at break remains approximately 630%.
The typical 13.9 MPa tensile stress at break provides strong mechanical performance.
The approximately 7.2 MPa stress at 100% elongation gives the material a firm response under deformation.
UL 94 V-0 flame retardancy makes it suitable for electrical and technical applications where vertical-flame performance matters.
The grade also carries wire-and-cable UL recognition and strong electrical-property data.
For customers requiring a high-hardness, natural/colorable flame-retardant TPV with V-0 performance and strong electrical properties, Santoprene 251-92W232 is an important grade to evaluate.
Processing Guidelines for Santoprene 251-92W232
The latest Celanese Materials Database lists the following processing methods:
- Injection molding
- Multi-injection molding
- Extrusion
- Sheet extrusion
- Coextrusion
- Blow molding
- Thermoforming
Current Grade-Specific Injection Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying Recommended | Yes |
| 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 | 190°C |
| Maximum Melt Temperature | 210°C |
| Optimum Mold Temperature | 30°C |
| Minimum Mold Temperature | 10°C |
| Maximum Mold Temperature | 50°C |
These are the latest grade-specific processing values from the Celanese Materials Database revision dated 2025-04-21.
Injection Molding Notes
Celanese recommends holding pressure at approximately 50–75% of actual injection pressure.
A relatively high screw speed of approximately 100–200 rpm is recommended.
Back pressure is not always required, but approximately 0.3–0.7 MPa may be used to maintain a homogeneous melt and consistent shot size. Higher back pressure may be used with masterbatch.
Processors should optimize:
- Injection speed
- Screw speed
- Holding pressure
- Back pressure
- Gate dimensions
- Runner design
- Melt temperature
- Mold temperature
- Venting
- Cooling time
- Surface appearance
Extrusion Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying Temperature | 82°C |
| Drying Time | 3 hours |
For extrusion and coextrusion, optimize:
- Barrel-zone temperatures
- Adapter temperature
- Die temperature
- Screw speed
- Melt pressure
- Draw-down
- Cooling
- Profile dimensions
- Surface finish
Shear-Dependent Flow
Santoprene 251-92W232 has relatively high viscosity at low shear rates.
As shear rate increases, viscosity decreases.
Celanese notes that increasing temperature has relatively little effect on TPV viscosity compared with increasing shear, and that smaller gates and higher shear rates can improve melt flow.
General Processing Window
Celanese recommends desiccant drying for approximately 3 hours at 80°C.
The broader Santoprene TPV processing window is approximately 175–230°C, although the current grade-specific injection window for 251-92W232 is narrower at 190–210°C.
Material Compatibility
Santoprene TPV is incompatible with acetal (POM) and PVC.
Processing equipment should be thoroughly purged when changing between these materials and Santoprene 251-92W232.
Related Products
We supply Santoprene TPV grades for different hardness, flame-retardancy, electrical and processing requirements.
Typical Santoprene product families include:
- Santoprene 251 Series
- Santoprene W232 flame-retardant grades
- Santoprene wire-and-cable grades
- Santoprene electrical grades
- Santoprene connector grades
- Santoprene high-hardness TPV grades
- Santoprene extrusion grades
- Santoprene specialty TPV grades
View More TPV Thermoplastic Vulcanizates →
If you need grade-selection support, send us your required Shore hardness, UL flame rating, electrical requirement, wall thickness and processing method.
Technical Documents for Santoprene 251-92W232
| Document Type | Description |
|---|---|
| TDS | Physical, mechanical, flammability, electrical and processing data |
| SDS | Safety Data Sheet |
| UL 94 Information | V-0 flame classification |
| UL Plastics Information | QMFZ2.E80017 / QMFZ8.E80017 |
| UL Wire & Cable Information | QMTT2.E86313 |
| Electrical Data | Dielectric strength, CTI and arc-resistance information |
| Processing Guide | Injection molding, extrusion and coextrusion guidance |
| Santoprene Product Finder | Celanese TPV portfolio information |
| COA | Batch-specific quality information where available |
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Please state Santoprene 251-92W232 and whether you require TDS, SDS, UL 94, electrical or wire-and-cable documentation.
FAQ About Santoprene 251-92W232
Q1: What is Santoprene 251-92W232?
Santoprene 251-92W232 is a high-hardness, natural/colorable flame-retardant TPV from Celanese intended for electrical, wire-and-cable and technical applications.
Q2: What is the hardness of Santoprene 251-92W232?
The typical hardness is approximately 98 Shore A.
Q3: Is Santoprene 251-92W232 UL 94 V-0?
Yes. Celanese lists the grade as UL 94 V-0 flame retardant. Grade-specific data reports V-0 at published thicknesses including 1.5 mm and 3.0 mm.
Q4: What is the elongation at break?
The typical value is approximately 630%.
Q5: What is the tensile stress at break?
The typical tensile stress at break is approximately 13.9 MPa.
Q6: What is the tensile stress at 100% elongation?
The typical value is approximately 7.2 MPa.
Q7: What is the density?
The latest Celanese Materials Database revision lists approximately 1.290 g/cm³.
Q8: What is the shear modulus?
The typical shear modulus is approximately 94 MPa.
Q9: What is the oxygen index?
The published oxygen index is approximately 26%.
Q10: What is the dielectric strength?
Current data lists approximately 31 kV/mm at 2 mm thickness.
Q11: Is Santoprene 251-92W232 suitable for wire and cable?
Yes. Celanese lists the grade under QMTT2.E86313, covering polymeric materials for use in wire, cable and flexible lighting products.
Q12: Does it contain metal deactivators?
No. Current Celanese grade information states that it does not contain metal deactivators.
Q13: What flame-retardant chemistry does it use?
Celanese describes Santoprene 251-92W232 as containing non-ether brominated flame retardants.
Q14: Can Santoprene 251-92W232 be injection molded?
Yes. Injection molding and multi-injection molding are listed processing methods.
Q15: What injection melt temperature is recommended?
The current grade-specific recommendation is approximately 200°C optimum, with a range of approximately 190–210°C.
Q16: What mold temperature is recommended?
Current Celanese guidance lists approximately 30°C optimum, with a range of approximately 10–50°C.
Request Santoprene 251-92W232 Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 251-92W232, please provide:
- Required quantity
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- Required UL flame rating
- Minimum wall thickness
- Required Shore hardness
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- Fluid or chemical exposure
- Injection-molding, extrusion or coextrusion process
- UL documentation requirement
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