描述
Santoprene 273-40 is a hard, natural and colorable specialty thermoplastic vulcanizate from Celanese designed for selected non-fatty food-contact applications.
Unlike softer Shore A food-contact TPV grades, Santoprene 273-40 is measured at approximately 41 Shore D, giving it substantially greater firmness while retaining elastomeric deformation.
Current Celanese data lists approximately:
- 41 Shore D hardness
- 610% elongation at break
- 18 MPa tensile stress at break
- 9 MPa tensile stress at 100% elongation
- 0.940 g/cm³ density
- 54% compression set at 70°C / 24 h
- 61% compression set at 125°C / 70 h
- -50°C brittleness temperature
This combination makes Santoprene 273-40 particularly useful where a food-contact component requires more structural support than conventional soft TPVs but still needs flexibility, toughness and repeated-flex durability.
Celanese describes the grade as shear dependent, polyolefin based and recyclable within the manufacturing stream. It can be processed on conventional thermoplastic equipment by injection molding, extrusion, blow molding, thermoforming and vacuum forming.
A major reason to select Santoprene 273-40 is its regulatory positioning. Celanese states that the grade can, in principle, be used in food-contact applications in the United States under applicable FDA requirements, although migration or use limitations may apply. It is specifically designed for non-fatty food-contact applications.
Santoprene 273-40 is also currently listed by NSF under NSF/ANSI 51 – Food Equipment Materials. NSF’s current listing includes the grade for repeated-use food-zone applications with several food categories and a maximum listed use temperature of 212°F / 100°C.
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 273-40
| Feature | Engineering Benefit |
|---|---|
| 41 Shore D Hardness | Provides a firm, high-support elastomeric response |
| FDA Food-Contact Positioning | Supports selected U.S. non-fatty food-contact applications |
| NSF/ANSI 51 Certified | Supports food-equipment material applications |
| 610% Elongation at Break | Maintains very high deformation capability |
| 18 MPa Tensile Stress at Break | Provides strong mechanical performance |
| 9 MPa Stress at 100% Elongation | Provides high resistance to deformation |
| 54% Compression Set @ 70°C / 24 h | Provides published compression-recovery data |
| -50°C Brittleness Temperature | Supports useful low-temperature flexibility |
| Excellent Flex-Fatigue Resistance | Suitable for repeatedly flexed components |
| Natural / Colorable | Supports customized product colors |
| Injection Moldable | Suitable for complex molded components |
| Extrudable / Coextrudable | Suitable for profiles, sheets and continuous sections |
| Blow Moldable | Supports selected hollow components |
| Thermoformable | Broadens processing options |
| Polyolefin Based | Combines elastomeric behavior with thermoplastic processing |
The most distinctive feature of Santoprene 273-40 is the combination of 41 Shore D hardness and approximately 610% elongation, which provides unusually high flexibility for such a firm TPV.
Typical Applications for Santoprene 273-40
Santoprene 273-40 is suitable for food-equipment and consumer applications where higher hardness and mechanical support are needed.
| Application Area | Typical Use |
|---|---|
| Food Equipment Seals | Firm elastomeric sealing components |
| Gaskets | High-hardness food-zone sealing |
| Closures | Firm flexible closure components |
| Food Processing Equipment | Flexible technical components |
| Food Containers | Seals and structural flexible interfaces |
| Kitchen Equipment | High-hardness flexible components |
| Appliance Components | Firm sealing and protective parts |
| Profiles | Extruded food-equipment profiles |
| Protective Components | Tough elastomeric covers and interfaces |
| Repeated-Flex Parts | Components requiring flex-fatigue resistance |
| Rigid-Flexible Assemblies | Flexible interfaces requiring higher stiffness |
| Technical Food-Contact Parts | Molded or extruded components for compatible applications |
Typical Properties of Santoprene 273-40
Physical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 940 kg/m³ / 0.940 g/cm³ | ISO 1183 |
| Shore D Hardness, 15 s | 41 | ISO 48-4 / ISO 868 |
| Brittleness Temperature | -50°C | ASTM D746 |
| Resin Identification | TPV | ISO 1043 |
| Part Marking Code | >TPV< | ISO 11469 |
| Product Form | Pellets | Manufacturer information |
| Appearance | Natural / Colorable | Manufacturer information |
The Celanese Materials Database lists 41 Shore D hardness, 0.940 g/cm³ density and -50°C brittleness temperature for Santoprene 273-40.
Mechanical Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile Stress at 100% Elongation | 9 MPa | ISO 37 |
| Tensile Stress at Break | 18 MPa | ISO 527-1/-2 or ISO 37 |
| Elongation at Break | 610% | ISO 527-1/-2 or ISO 37 |
| Compression Set, 70°C / 24 h | 54% | ISO 815 |
| Compression Set, 125°C / 70 h | 61% | ISO 815 |
| Shore D Hardness | 41 | ISO 48-4 / ISO 868 |
These values show why Santoprene 273-40 is relevant to applications requiring a relatively hard elastomer without sacrificing high extensibility.
FDA Food-Contact Positioning
A key feature of Santoprene 273-40 is its positioning for selected food-contact applications.
Celanese describes the grade as designed for non-fatty food contact and states that the product can, in principle, be used in food-contact applications in the United States under applicable FDA requirements. Migration or use limitations may apply.
Potential applications include:
- Food-equipment seals
- Gaskets
- Closures
- Appliance components
- Food-processing machinery parts
- Flexible structural components
- Selected profiles and protective parts
For customer-facing copy, the more accurate wording is:
“Suitable for selected non-fatty food-contact applications under applicable U.S. FDA requirements.”
NSF/ANSI 51 Food Equipment Certification
Santoprene 273-40 is currently listed under NSF/ANSI 51 – Food Equipment Materials.
The current NSF listing covers:
- Alcohol greater than 8%
- Alcohol less than or equal to 8%
- Aqueous acidic foods
- Aqueous non-acidic foods
- Dairy / oil-in-water emulsions
- Dry solids
The listed maximum use temperature is 212°F / 100°C. NSF also notes that Santoprene 273-40 is acceptable for repeated use under the listed conditions.
This makes the grade relevant to:
- Commercial food equipment
- Food-processing equipment
- Beverage equipment
- Kitchen appliances
- Reusable sealing components
- High-hardness food-zone parts
High-Hardness Food-Contact TPV
One of the most important characteristics of Santoprene 273-40 is its 41 Shore D hardness.
Shore D measurement is generally used for harder elastomeric and plastic-like materials, so this grade provides considerably more rigidity than conventional soft Shore A TPVs.
Despite the high hardness, Santoprene 273-40 retains approximately 610% elongation at break.
This combination can be useful in components that require:
- Shape retention
- Mechanical support
- Toughness
- Elastic deformation
- Repeated movement
- Snap or flex behavior
- Flexible interfaces between rigid parts
Flex-Fatigue Resistance
Celanese specifically recommends Santoprene 273-40 for applications requiring excellent flex-fatigue resistance.
This is relevant to components that repeatedly:
- Bend
- Flex
- Compress
- Recover
- Deflect
- Move during equipment operation
The combination of high hardness and high elongation makes the grade useful for demanding repeated-flex technical parts.
Low-Temperature Performance
Santoprene 273-40 has a published brittleness temperature of approximately -50°C.
This provides useful flexibility at low temperature for applications exposed to:
- Refrigerated environments
- Cold storage
- Temperature cycling
- Low-temperature transportation
- Cold-start conditions
Why Choose Santoprene 273-40?
The main reason to choose Santoprene 273-40 is its unusual balance of hardness, mechanical strength and flexibility.
At approximately 41 Shore D, the grade provides substantially more rigidity than most food-contact Santoprene grades.
Its approximately 610% elongation at break means it can still undergo large deformation before failure.
The typical 18 MPa tensile stress at break provides strong mechanical performance, while approximately 9 MPa stress at 100% elongation provides a firm response under load.
The material also offers published low-temperature performance down to approximately -50°C and is recommended for applications requiring excellent flex-fatigue resistance.
Most importantly, Santoprene 273-40 combines this high mechanical performance with FDA non-fatty food-contact positioning and NSF/ANSI 51 certification.
For customers requiring a high-hardness food-contact TPV with 41 Shore D hardness, NSF 51 certification and excellent elongation, Santoprene 273-40 is an important grade to evaluate.
Processing Guidelines for Santoprene 273-40
Santoprene 273-40 is shear dependent and can be processed using conventional thermoplastic equipment.
Current Celanese data lists:
- 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 | 80–82°C |
| Drying Time | 3 hours |
| Maximum Regrind Level | 20% |
| General Processing Window | 175–230°C |
| Recommended Back Pressure | Approx. 0.3–0.7 MPa |
| Screw Speed | 100–200 rpm |
Celanese recommends desiccant drying for approximately 3 hours at 80°C, while the grade-specific extrusion section lists 82°C for 3 hours. The broader Santoprene TPV processing window is approximately 175–230°C.
Injection Molding Reference Conditions
| Processing Parameter | Published Guidance |
|---|---|
| Drying Temperature | 82°C |
| Drying Time | 3 hours |
| Maximum Moisture Content | 0.08% |
| Maximum Regrind | 20% |
| Rear Barrel Temperature | 193°C |
| Middle Barrel Temperature | 199°C |
| Front Barrel Temperature | 204°C |
| Nozzle Temperature | 210–238°C |
| Processing Melt Temperature | 216–232°C |
| Mold Temperature | 10–52°C |
| Injection Speed | Fast |
| Back Pressure | 0.345–0.689 MPa |
| Screw Speed | 100–200 rpm |
| Vent Depth | Approx. 0.025 mm |
Published grade-specific processing data provides these settings as useful starting points for injection-molding trials.
Extrusion Conditions
| Processing Parameter | Published Guidance |
|---|---|
| Drying Temperature | 82°C |
| Drying Time | 3 hours |
| Melt Temperature Reference | 210°C |
The Celanese Materials Database lists approximately 210°C as the grade-specific extrusion melt-temperature reference.
Shear-Dependent Flow
Santoprene 273-40 has relatively high melt viscosity at low shear rates, while viscosity decreases as shear rate increases.
Celanese notes that higher shear can improve melt flow and that temperature has a comparatively smaller effect on viscosity than shear.
Processors should optimize:
- Injection speed
- Screw speed
- Gate size
- Melt pressure
- Barrel temperatures
- Die geometry
- Draw-down
- Cooling conditions
- Surface finish
Material Compatibility
Celanese processing guidance states that Santoprene TPV is incompatible with acetal (POM) and PVC.
Processing equipment should therefore be thoroughly purged when changing between these polymers and Santoprene 273-40.
Related Products
We supply Santoprene TPV grades for different food-contact, NSF, hardness and processing requirements.
Typical Santoprene product families include:
- Santoprene 273 Series
- Santoprene 271 Series
- Santoprene FDA food-contact grades
- Santoprene NSF 51 grades
- Santoprene food-equipment grades
- Santoprene high-hardness TPV grades
- Santoprene sealing grades
- Santoprene extrusion grades
- Santoprene specialty TPV grades
View More TPV Thermoplastic Vulcanizates →
If you need grade-selection support, send us your required hardness, food-contact condition, temperature and processing method.
Technical Documents for Santoprene 273-40
| Document Type | Description |
|---|---|
| TDS | Physical, mechanical and processing data |
| SDS | Safety Data Sheet |
| FDA Information | Food-contact regulatory information for applicable uses |
| NSF 51 Information | Food Equipment Materials certification |
| UL Information | QMFZ2.E80017 / QMFZ8.E80017 |
| Processing Guide | Injection molding and extrusion guidance |
| Santoprene Product Finder | Celanese TPV portfolio information |
| COA | Batch-specific quality information where available |
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Please state Santoprene 273-40 and whether you require TDS, SDS, FDA, NSF or other technical documentation.
FAQ About Santoprene 273-40
Q1: What is Santoprene 273-40?
Santoprene 273-40 is a hard, natural/colorable specialty TPV from Celanese developed for selected non-fatty food-contact and food-equipment applications.
Q2: What is the hardness of Santoprene 273-40?
The typical hardness is approximately 41 Shore D.
Q3: Is Santoprene 273-40 a Shore A 40 material?
No. The current published hardness is 41 Shore D, not Shore A 40.
Q4: Is Santoprene 273-40 suitable for FDA food-contact applications?
Celanese states that it can, in principle, be used in applicable U.S. food-contact applications, subject to migration or use limitations. It is specifically designed for non-fatty food-contact applications.
Q5: Is Santoprene 273-40 NSF 51 certified?
Yes. Santoprene 273-40 is currently listed under NSF/ANSI 51 Food Equipment Materials.
Q6: What is the density?
The typical density is approximately 0.940 g/cm³.
Q7: What is the elongation at break?
The typical elongation at break is approximately 610%.
Q8: What is the tensile stress at break?
The typical tensile stress at break is approximately 18 MPa.
Q9: What is the tensile stress at 100% elongation?
The typical value is approximately 9 MPa.
Q10: What is the compression set?
Published values are approximately 54% at 70°C / 24 h and 61% at 125°C / 70 h.
Q11: What is the low-temperature performance?
The published brittleness temperature is approximately -50°C.
Q12: What food types are covered by the NSF listing?
The current NSF listing includes alcoholic foods, aqueous acidic and non-acidic foods, dairy/oil-in-water emulsions and dry solids.
Q13: What is the NSF maximum use temperature?
The current NSF listing gives a maximum use temperature of 212°F / 100°C.
Q14: Is Santoprene 273-40 acceptable for repeated use?
Yes. The NSF listing identifies Santoprene 273-40 as acceptable for repeated use under its listed conditions.
Q15: Can Santoprene 273-40 be injection molded?
Yes. Injection molding and multi-injection molding are listed processing methods.
Q16: Can Santoprene 273-40 be extruded?
Yes. Extrusion, sheet extrusion and coextrusion are listed, with approximately 210°C given as the grade-specific melt-temperature reference.
Request Santoprene 273-40 Price & Technical Support
For pricing, availability, technical documents or application support for Santoprene 273-40, please provide:
- Required quantity
- Destination country or port
- Food-equipment, appliance, profile or sealing application
- Required Shore hardness
- Required color
- Food-contact requirement
- NSF 51 requirement
- Maximum service temperature
- Food type or contact medium
- Injection-molding, extrusion or blow-molding process
- TDS / SDS requirement
- FDA / NSF documentation requirement
- Sample requirement, if applicable
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