Many engineers ask this during material selection: “Is Viton just another name for fluoroelastomer?” The answer is both yes—and not exactly.
Viton is a brand of fluoroelastomer rubber developed by DuPont (now Chemours). While all Viton is fluoroelastomer (FKM), not all fluoroelastomer is Viton.
In our factory, we’re often asked to quote either “Viton seals” or “FKM parts.” Understanding the difference can help you control cost, quality, and compliance without sacrificing performance.
What is fluoroelastomer?
Fluoroelastomer, also known as FKM (per ISO 1629) or FPM (per DIN/EN), is a family of synthetic rubbers known for their high resistance to heat, oil, fuels, and chemicals.
Fluoroelastomers are premium rubber compounds widely used in sealing applications where aggressive fluids or high temperatures are present.
✅ Core Properties of FKM
| Property | Value |
|---|---|
| Heat resistance1 | Up to 230°C (some types to 300°C) |
| Fuel and oil resistance2 | Excellent |
| Chemical resistance3 | Very good (except some ketones/amines) |
| Ozone/UV resistance | Excellent |
| Applications | Automotive, chemical, aerospace, HVAC |
In our production, we use FKM for crankshaft seals, fuel O-rings, and compressor shaft gaskets—especially when NBR or EPDM would swell or break down.
What is Viton?
Viton is a registered trademark for a line of fluoroelastomers developed by DuPont (now Chemours). It’s the most well-known brand name in the FKM category.
Viton refers specifically to Chemours' proprietary formulation of FKM, known for consistent quality and performance across industries.
📦 About the Brand Viton®
| Brand | Viton® by Chemours4 (formerly DuPont) |
|---|---|
| Category | Fluoroelastomer (FKM/FPM) |
| Launched | 1957 |
| Applications | Aerospace, automotive, oil & gas, HVAC |
| Types available | A, B, F, GF, ETP (each with specific traits) |
We source genuine Viton5 on request for customers who must meet aerospace or OEM specs6. It’s more expensive than generic FKM but sometimes required by spec.
Is there a performance difference between Viton and other FKMs?
Yes, and no. For general industrial use, many high-quality non-branded FKMs match Viton in performance. But Viton guarantees tighter control on formulation, traceability, and certification.
Generic FKM can perform just as well as Viton—but only if it comes from a reputable manufacturer with proper formulation and testing.
🔍 FKM vs Viton – Key Differences
| Feature | Viton (Chemours)7 | Generic FKM8 |
|---|---|---|
| Trademark protection | ✅ Yes | ❌ No |
| Chemical consistency | Tight quality control | Varies by supplier |
| Certification availability | Full data sheets, traceability | Sometimes limited |
| Price | Higher | More affordable |
| Compliance (OEM specs) | Widely accepted | May require validation |
If your seal needs FDA compliance9 or must meet aerospace standards (like AMS or MIL), using branded Viton is often the safer route.
When should you specify “Viton” and when is “FKM” enough?
It depends on whether you're buying to spec or to function.
If you're working under specific certifications or with critical equipment, request Viton. If you just need FKM-level performance, a high-grade generic fluoroelastomer will likely suffice.
📌 When to Use Viton
- OEM drawings specifically require “Viton®”
- Aerospace, military, or nuclear grade applications
- FDA/EU compliance10 is critical and must be documented
- You need full material traceability and brand assurance
📌 When Generic FKM Is Enough
- Automotive aftermarket parts
- Industrial pumps, compressors, general equipment
- Cost-sensitive sealing where performance still matters
- Projects without brand-specific requirements
We’ve helped many customers switch from branded Viton to high-quality generic FKM for cost savings—without sacrificing durability. But we’re always transparent about the difference.
Conclusion
Viton is a type of fluoroelastomer. All Viton is FKM, but not all FKM is Viton. The difference lies in brand, certification, and consistency—not base chemistry.
Need FKM or Viton rubber seals for fuel, oil, or chemical resistance?
Contact Julong Rubber or Request a Quote to get branded or non-branded options tailored to your needs.
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Understanding the heat resistance of FKM is crucial for applications in high-temperature environments. Explore this link for detailed insights. ↩
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Discover why FKM is preferred for fuel O-rings and seals due to its superior resistance to fuels and oils. This resource will provide valuable comparisons. ↩
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Learn about the chemical resistance of FKM and its limitations, which is essential for selecting materials in various industries. This link offers comprehensive information. ↩
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Explore the advantages of Viton® in aerospace to understand its unique properties and why it's preferred over generic options. ↩
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Learn about the cost differences and quality assurance of genuine Viton compared to generic alternatives, crucial for compliance. ↩
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Understanding these specifications is vital for industries to ensure safety and compliance in their applications. ↩
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Explore the advantages of Viton (Chemours) for seals, especially for FDA compliance and aerospace standards, ensuring quality and safety. ↩
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Learn about the potential risks and limitations of using Generic FKM, especially regarding compliance and quality control. ↩
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Understanding FDA compliance is crucial for selecting seal materials, ensuring safety and regulatory adherence in your applications. ↩
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Learn about the importance of FDA/EU compliance in manufacturing to ensure safety and regulatory adherence. ↩
