FFKM vs. FPM

Attribute	FFKM	FPM
Temperature Resistance	Up to 327°C	Up to 204°C
Chemical Resistance	Excellent	Good
Compression Set	Low	Medium
Hardness	70-90 Shore A	60-90 Shore A
Elasticity	High	Medium

Introduction

When it comes to choosing the right material for sealing applications, engineers often find themselves comparing various options to determine which one best suits their needs. Two popular choices in the industry are FFKM (Perfluoroelastomer) and FPM (Fluoroelastomer). Both materials offer unique properties that make them suitable for different environments and applications. In this article, we will compare the attributes of FFKM and FPM to help you make an informed decision.

Chemical Resistance

One of the key factors to consider when selecting 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, FPM also offers good chemical resistance, but it may not be as resistant to certain aggressive chemicals as FFKM. Engineers should carefully evaluate the specific chemicals that the material will come into contact with to determine which option is best suited for their needs.

Temperature Resistance

Another important attribute to consider is the temperature resistance of the sealing material. FFKM is known for its excellent high-temperature performance, with the ability to withstand temperatures up to 327°C (620°F). This makes it suitable for applications where extreme heat is a factor. In comparison, FPM has a lower temperature resistance, typically ranging from -20°C to 204°C (-4°F to 400°F). Engineers should consider the operating temperature range of their application to determine which material will perform best under those conditions.

Compression Set

Compression set refers to the ability of a material to maintain its shape and sealing properties after being compressed over time. FFKM exhibits low compression set, meaning it can maintain a tight seal even after prolonged compression. This makes it a reliable choice for applications where sealing integrity is critical. On the other hand, FPM may have a higher compression set compared to FFKM, which could impact its long-term sealing performance. Engineers should consider the expected compression levels in their application to choose the material that will provide the best sealing performance over time.

Flexibility and Elasticity

Flexibility and elasticity are important factors to consider when selecting a sealing material, as they can impact the material's ability to conform to irregular surfaces and maintain a tight seal. FFKM is known for its excellent flexibility and elasticity, allowing it to adapt to various surface shapes and sizes. This makes it a versatile choice for applications with complex sealing requirements. FPM also offers good flexibility and elasticity, but it may not be as flexible as FFKM in certain applications. Engineers should evaluate the surface characteristics of their application to determine which material will provide the best sealing performance.

Abrasion Resistance

Abrasion resistance is another important attribute to consider, especially in applications where the sealing material may come into contact with abrasive substances. FFKM is known for its excellent abrasion resistance, making it suitable for applications where wear and tear are a concern. FPM also offers good abrasion resistance, but it may not be as resistant to abrasion as FFKM. Engineers should consider the potential for abrasion in their application to choose the material that will provide the best long-term performance.

Conclusion

In conclusion, both FFKM and FPM offer unique properties that make them suitable for a wide range of sealing applications. FFKM excels in areas such as chemical resistance, high-temperature performance, compression set, flexibility, and abrasion resistance. On the other hand, FPM offers good chemical resistance, temperature resistance, flexibility, and elasticity. Engineers should carefully evaluate the specific requirements of their application to determine which material will provide the best sealing performance. By considering factors such as chemical exposure, temperature range, compression set, flexibility, and abrasion resistance, engineers can make an informed decision when choosing between FFKM and FPM for their sealing needs.