FFKM vs. PTFE

Attribute	FFKM	PTFE
Chemical Resistance	Excellent	Excellent
Temperature Resistance	Up to 327°C	Up to 260°C
Flexibility	Good	Poor
Cost	Expensive	Relatively Inexpensive

Introduction

When it comes to choosing the right material for sealing applications, two popular options are FFKM (perfluoroelastomer) and PTFE (polytetrafluoroethylene). Both materials have unique attributes that make them suitable for different environments and conditions. In this article, we will compare the key attributes of FFKM and PTFE to help you make an informed decision for your specific application.

Chemical Resistance

One of the most important factors to consider when choosing a sealing material is its chemical resistance. FFKM is known for its exceptional resistance to a wide range of chemicals, including acids, bases, solvents, and fuels. This makes it an ideal choice for applications where exposure to harsh chemicals is a concern. On the other hand, PTFE also offers excellent chemical resistance, particularly to acids and bases. However, it may not be as resistant to certain solvents and fuels as FFKM.

Temperature Resistance

Another critical attribute to consider is temperature resistance. FFKM is capable of withstanding extreme temperatures, ranging from -20°C to over 300°C, making it suitable for high-temperature applications. PTFE, on the other hand, has an even wider temperature range, with a maximum continuous use temperature of around 260°C. This makes PTFE a better choice for applications that require resistance to extreme heat.

Compression Set

Compression set refers to the ability of a material to maintain its shape and sealing properties after being compressed over time. FFKM has excellent compression set resistance, meaning it can maintain a tight seal even after prolonged compression. PTFE also has good compression set resistance, but it may not be as resilient as FFKM in certain high-pressure applications.

Flexibility

Flexibility is another important attribute to consider, especially in applications where the sealing material needs to conform to irregular surfaces. FFKM is known for its flexibility and elasticity, allowing it to adapt to various shapes and sizes. PTFE, on the other hand, is a rigid material that may not be as flexible as FFKM. This can be a disadvantage in applications where flexibility is crucial.

Abrasion Resistance

Abrasion resistance is essential in applications where the sealing material is exposed to friction or wear. FFKM has excellent abrasion resistance, making it suitable for high-wear environments. PTFE also offers good abrasion resistance, but it may not be as durable as FFKM in certain abrasive conditions. It is important to consider the level of abrasion resistance required for your specific application when choosing between FFKM and PTFE.

Cost

Cost is often a significant factor in material selection decisions. FFKM is typically more expensive than PTFE due to its superior chemical resistance and temperature range. While the initial cost of FFKM may be higher, its long-term performance and durability may justify the investment in certain applications. PTFE, on the other hand, is a more cost-effective option for applications where extreme chemical resistance or temperature resistance is not required.

Conclusion

In conclusion, both FFKM and PTFE have unique attributes that make them suitable for different sealing applications. FFKM offers exceptional chemical resistance, temperature resistance, compression set resistance, flexibility, and abrasion resistance, making it an ideal choice for high-performance applications. PTFE, on the other hand, provides good chemical resistance, temperature resistance, and abrasion resistance at a lower cost. Ultimately, the choice between FFKM and PTFE will depend on the specific requirements of your application and the level of performance needed.