描述
Santoprene 253-40 HF is a high-hardness, colorable, halogen-free flame-retardant thermoplastic vulcanizate from Celanese designed for electrical, wire-and-cable and technical applications requiring greater stiffness than conventional Shore A TPV materials.
The grade is part of Celanese’s newer Santoprene HFFR family developed for evolving electrical applications that must meet modern regional standards and flame-retardancy requirements. Celanese specifically identifies Santoprene 253-40 HF and 251-90 HF as halogen-free flame-retardant grades suitable for drag-chain cables, robotic cables, mixed-signal cables, CAN bus cables and coaxial cables.
Current Celanese Materials Database data lists:
- 46 Shore D hardness
- 610% elongation at break
- 12.1 MPa tensile stress at break
- 6.9 MPa tensile stress at 100% elongation
- 7.1 MPa tensile stress at 50% elongation
- 7.0 MPa stress at 10% elongation
- 5.8 MPa stress at 5% elongation
- 1.100 g/cm³ density
This combination is especially notable because Santoprene 253-40 HF maintains approximately 610% elongation despite its 46 Shore D hardness.
The grade also has a published oxygen index of 43%, indicating strong flame-resistant behavior under the relevant ISO test method.
According to the May 2025 Celanese material sheet, Santoprene 253-40 HF achieves UL 94 V-0 performance down to 1.6 mm based on internal testing.
The flame-retardant additive system is identified as non-halogenated and red-phosphorus free, distinguishing it from conventional brominated flame-retardant TPV formulations.
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 253-40 HF
| Feature | Engineering Benefit |
|---|---|
| 46 Shore D Hardness | Provides high stiffness while retaining elastomeric behavior |
| Halogen Free | Supports electrical applications requiring non-halogenated materials |
| UL 94 V-0 @ 1.6 mm | Strong vertical-flame performance based on Celanese internal testing |
| 610% Elongation at Break | Maintains exceptional deformation capability |
| 12.1 MPa Tensile Stress at Break | Provides strong mechanical performance |
| 6.9 MPa Stress at 100% Elongation | Supports firm elastomeric response |
| 43% Oxygen Index | Indicates strong resistance to sustained combustion |
| Red-Phosphorus Free | Avoids red-phosphorus flame-retardant chemistry |
| Colorable | Supports customized product colors |
| Wire & Cable Extrusion | Specifically suited to cable-processing applications |
| Injection Moldable | Suitable for technical molded components |
| Extrudable / Coextrudable | Useful for cable jackets, profiles and multilayer structures |
| Blow Moldable | Supports selected hollow parts |
| Thermoformable | Broadens manufacturing flexibility |
| Recyclable in Manufacturing Stream | Supports controlled in-process material reuse |
The strongest reason to select Santoprene 253-40 HF is its combination of Shore D hardness, very high elongation and halogen-free V-0 flame-retardant performance.
Typical Applications for Santoprene 253-40 HF
Celanese specifically promotes its Santoprene HF grades for modern cable applications.
| Application Area | Typical Use |
|---|---|
| Drag-Chain Cables | High-durability cable jackets exposed to repeated motion |
| Robotic Cables | Flexible but structurally supported cable protection |
| CAN Bus Cables | Automotive and industrial communication-cable jackets |
| Mixed-Signal Cables | Flame-retardant protective jackets |
| Coaxial Cables | Tough outer jackets and protection |
| Industrial Cable Jackets | High-hardness flexible protection |
| Cable Boots | Firm flame-retardant cable-entry components |
| Strain Reliefs | High-strength molded cable support |
| Electrical Connectors | Firm elastomeric housings and sealing components |
| Automation Equipment | Technical parts exposed to repeated movement |
| Industrial Electrical Parts | High-hardness flame-retardant elastomeric parts |
| Telecom Equipment | Flexible protective components |
Typical Properties of Santoprene 253-40 HF
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 1100 kg/m³ / 1.100 g/cm³ | ISO 1183 |
| Shore D Hardness, 15 s | 46 | ISO 48-4 / ISO 868 |
| Resin Identification | TPV | ISO 1043 |
| Part Marking Code | >TPV< | ISO 11469 |
| Product Form | Pellets | Manufacturer information |
| Appearance | Colorable | Manufacturer information |
The current Celanese Materials Database revision dated 2025-05-12 gives a density of approximately 1.100 g/cm³ and hardness of 46 Shore D.
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Stress at 5% Elongation | 5.8 MPa | ISO 527-1/-2 or ISO 37 |
| Stress at 10% Elongation | 7.0 MPa | ISO 527-1/-2 or ISO 37 |
| Tensile Stress at 50% Elongation | 7.1 MPa | ISO 527-1/-2 or ISO 37 |
| Tensile Stress at 100% Elongation | 6.9 MPa | ISO 37 |
| Tensile Stress at Break | 12.1 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break | 610% | ISO 527-1/-2 or ISO 37 |
| Shore D Hardness | 46 | ISO 48-4 / ISO 868 |
The standout property is the combination of 46 Shore D hardness and 610% elongation, allowing Santoprene 253-40 HF to provide much more structural support than softer TPVs while remaining highly deformable.
Halogen-Free Flame-Retardant Performance
The primary technical differentiator of Santoprene 253-40 HF is its halogen-free flame-retardant formulation.
Celanese identifies the grade as:
- Halogen Free
- Non-halogenated flame retardant
- Red-phosphorus free
- UL 94 V-0 down to 1.6 mm based on internal testing
Flammability Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Flame Rating | V-0 | UL 94 / IEC 60695-11-10 |
| Thickness Tested | 1.6 mm | IEC 60695-11-10 |
| Oxygen Index | 43% | ISO 4589-1/-2 |
| Flame-Retardant Chemistry | Non-halogenated | Manufacturer information |
| Red Phosphorus | Not used in flame-retardant system | Manufacturer information |
The published 43% oxygen index is particularly significant for a flexible polymer system.
What Does HF Mean in Santoprene 253-40 HF?
The suffix HF refers to the grade’s halogen-free flame-retardant positioning.
This is particularly relevant in electrical and cable applications where designers may want to reduce the use of halogenated flame-retardant systems.
Santoprene 253-40 HF should therefore be positioned as:
Halogen-Free Flame-Retardant TPV
rather than simply as a standard flame-retardant Santoprene grade.
It should also not automatically be described as low-smoke halogen-free unless the relevant complete cable construction has been tested for the required smoke-performance standard.
Wire & Cable Applications
Celanese specifically states that Santoprene 253-40 HF and 251-90 HF can be successfully used in:
- Drag-chain cables
- Robotic cables
- Mixed-signal cables
- CAN bus cables
- Coaxial cables
These applications benefit from the material’s combination of:
- Flame resistance
- High flexibility
- High hardness
- Repeated-movement capability
- Thermoplastic processability
- Halogen-free formulation
Why Choose Santoprene 253-40 HF?
The main reason to choose Santoprene 253-40 HF is its unusual combination of high Shore D hardness and high elongation.
At approximately 46 Shore D, the material provides substantially greater stiffness than conventional Shore A TPV grades.
Despite this high hardness, elongation at break remains approximately 610%.
The approximately 12.1 MPa tensile stress at break provides strong mechanical performance.
The material’s 43% oxygen index supports its flame-retardant positioning.
Most importantly, the grade uses a non-halogenated, red-phosphorus-free flame-retardant system and achieves V-0 performance at 1.6 mm based on Celanese internal testing.
This makes it particularly attractive for cable applications requiring more mechanical support than softer HFFR TPV materials.
For customers requiring a high-hardness halogen-free flame-retardant TPV for robotic cable, drag-chain cable, CAN bus cable or electrical components, Santoprene 253-40 HF is a key grade to evaluate.
Processing Guidelines for Santoprene 253-40 HF
Current Celanese data lists the following processing methods:
- Wire and cable extrusion
- Injection molding
- Multi-injection molding
- Extrusion
- Sheet extrusion
- Coextrusion
- Blow molding
- Thermoforming
Drying & General Processing Conditions
| Processing Parameter | Celanese Guidance |
|---|---|
| Drying Recommended | Yes |
| Drying Temperature | 80°C |
| Drying Time | 3 hours |
| Screw Speed | 100–200 rpm |
| Back Pressure | 0.3–0.7 MPa |
| Holding Pressure | 50–75% of actual injection pressure |
Celanese recommends 3 hours of desiccant drying at 80°C.
Injection Molding Notes
For injection molding, holding pressure should generally be around 50–75% of actual injection pressure.
Celanese recommends relatively high screw speeds of approximately 100–200 rpm.
Back pressure is not always required, but approximately 0.3–0.7 MPa may be used to help maintain melt homogeneity and shot consistency.
Important variables include:
- Melt temperature
- Injection speed
- Screw speed
- Holding pressure
- Back pressure
- Gate dimensions
- Mold temperature
- Runner design
- Venting
- Cooling time
Wire & Cable Extrusion
Because wire-and-cable extrusion is explicitly listed as a processing method, it is one of the most important processing routes for Santoprene 253-40 HF.
Processors should optimize:
- Barrel-zone temperatures
- Screw geometry
- Screw speed
- Adapter temperature
- Die temperature
- Melt pressure
- Draw-down ratio
- Cable-jacket thickness
- Line speed
- Cooling conditions
- Concentricity
- Surface finish
Shear-Dependent Flow
Santoprene 253-40 HF is specifically identified as a shear-dependent TPV.
As shear rate increases, apparent melt viscosity decreases.
This can help the material flow more efficiently through cable extrusion dies and injection-molding gates.
Related Products
We supply Santoprene TPV grades for different halogen-free, flame-retardant, electrical, hardness and wire-and-cable requirements.
Typical Santoprene product families include:
- Santoprene HF flame-retardant grades
- Santoprene 253 Series
- Santoprene 251 Series
- Santoprene wire-and-cable grades
- Santoprene robotic-cable grades
- Santoprene electrical grades
- Santoprene cable-jacketing grades
- Santoprene coextrusion grades
- Santoprene specialty TPV grades
View More TPV Thermoplastic Vulcanizates →
If you need grade-selection support, send us your required Shore hardness, halogen-free requirement, flame rating, cable construction and processing method.
Technical Documents for Santoprene 253-40 HF
| Document Type | Description |
|---|---|
| TDS | Physical, mechanical, flame-retardant and processing data |
| SDS | Safety Data Sheet |
| Flammability Information | V-0 at 1.6 mm based on Celanese internal testing |
| Halogen-Free Information | Non-halogenated flame-retardant formulation |
| Wire & Cable Information | Cable-extrusion and application information |
| Processing Guide | Injection molding, extrusion and coextrusion guidance |
| Santoprene Product Finder | Celanese TPV portfolio and grade information |
| COA | Batch-specific quality information where available |
Need technical documents for Santoprene 253-40 HF?
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Please state Santoprene 253-40 HF and whether you require TDS, SDS, flame-retardant, halogen-free or wire-and-cable documentation.
FAQ About Santoprene 253-40 HF
Q1: What is Santoprene 253-40 HF?
Santoprene 253-40 HF is a colorable, high-hardness, halogen-free flame-retardant TPV from Celanese developed for electrical and wire-and-cable applications.
Q2: What is the hardness of Santoprene 253-40 HF?
The typical hardness is approximately 46 Shore D.
Q3: Is Santoprene 253-40 HF UL 94 V-0?
Celanese’s current material sheet states UL 94 V-0 down to 1.6 mm based on internal testing.
Q4: What is the elongation at break?
The typical elongation at break is approximately 610%.
Q5: What is the tensile stress at break?
The typical tensile stress at break is approximately 12.1 MPa.
Q6: What is the tensile stress at 100% elongation?
The typical value is approximately 6.9 MPa.
Q7: What is the density?
The typical density is approximately 1.100 g/cm³.
Q8: What is the oxygen index?
The current typical oxygen index is approximately 43%.
Q9: Is Santoprene 253-40 HF halogen free?
Yes. Celanese explicitly identifies the grade as Halogen Free.
Q10: Is it red-phosphorus free?
Yes. The flame-retardant system is described as non-halogenated / red-phosphorus free.
Q11: Is Santoprene 253-40 HF suitable for robotic cable?
Yes. Celanese specifically identifies robotic cables as one of the target applications for its 253-40 HF and 251-90 HF HFFR grades.
Q12: Can it be used for drag-chain cable?
Yes. Drag-chain cable is specifically listed by Celanese as a target application.
Q13: Can Santoprene 253-40 HF be injection molded?
Yes. Injection molding and multi-injection molding are explicitly listed processing methods.
Q14: Can Santoprene 253-40 HF be extruded?
Yes. Conventional extrusion, sheet extrusion, coextrusion and dedicated wire-and-cable extrusion are listed.
Q15: Does Santoprene 253-40 HF require drying?
Celanese recommends approximately 3 hours of desiccant drying at 80°C.
Q16: Is Santoprene 253-40 HF a Shore A 40 material?
No. The current published hardness is approximately 46 Shore D. The “40” in the grade designation should not be interpreted as Shore A 40.
Request Santoprene 253-40 HF Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 253-40 HF, please provide:
- Required quantity
- Destination country or port
- Robotic, drag-chain, CAN bus, coaxial or electrical application
- Halogen-free requirement
- Required flame rating
- Minimum wall or cable-jacket thickness
- Required hardness
- Required color
- Cable construction
- Repeated-flex requirement
- Electrical-property requirement
- Injection-molding or extrusion process
- TDS / SDS requirement
- Flame-retardant documentation requirement
- Sample requirement, if applicable
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