FEP vs. Viton

Attribute	FEP	Viton
Chemical Resistance	Excellent	Excellent
Temperature Range	-70°C to 200°C	-20°C to 200°C
Flexibility	Good	Good
Cost	Lower	Higher

Introduction

When it comes to choosing the right material for sealing applications, two popular options are FEP (fluorinated ethylene propylene) and Viton. Both materials have unique attributes that make them suitable for different situations. In this article, we will compare the key characteristics of FEP and Viton to help you make an informed decision.

Chemical Resistance

One of the most important factors to consider when choosing a sealing material is its chemical resistance. FEP is known for its excellent resistance to a wide range of chemicals, including acids, bases, and solvents. This makes it a popular choice for applications where exposure to harsh chemicals is a concern. On the other hand, Viton is also highly resistant to many chemicals, but it may not be as versatile as FEP in this regard.

Temperature Resistance

Another crucial attribute to consider is temperature resistance. FEP has a high operating temperature range, typically from -200°C to 200°C. This makes it suitable for applications where extreme temperatures are a factor. Viton, on the other hand, has a slightly lower temperature range, typically from -20°C to 200°C. While both materials can withstand high temperatures, FEP may be the better choice for extremely low or high temperature environments.

Flexibility

Flexibility is another important factor to consider when choosing a sealing material. FEP is known for its excellent flexibility, allowing it to conform to irregular shapes and surfaces. This makes it ideal for applications where a tight seal is required. Viton, on the other hand, is also flexible but may not be as pliable as FEP. Depending on the specific requirements of your application, you may need to consider the flexibility of each material.

Compression Set

Compression set refers to the ability of a material to return to its original shape after being compressed. FEP has a low compression set, meaning it can maintain a tight seal even after repeated compression cycles. Viton, on the other hand, may have a higher compression set, which could affect its sealing performance over time. If your application requires a material with low compression set, FEP may be the better choice.

Abrasion Resistance

Abrasion resistance is another important attribute to consider, especially in applications where the sealing material may come into contact with abrasive substances. FEP has good abrasion resistance, making it suitable for applications where wear and tear are a concern. Viton, on the other hand, may not be as abrasion-resistant as FEP. If your application involves abrasive materials, you may want to consider the abrasion resistance of each material.

Cost

Cost is always a factor to consider when choosing a sealing material. FEP is typically more expensive than Viton, which may impact your decision depending on your budget constraints. While FEP offers excellent performance in terms of chemical resistance, temperature resistance, and flexibility, you may need to weigh the cost against these benefits. Viton, on the other hand, may be a more cost-effective option for applications where high performance is not a priority.

Conclusion

In conclusion, both FEP and Viton have unique attributes that make them suitable for different sealing applications. FEP offers excellent chemical resistance, temperature resistance, flexibility, and compression set, making it ideal for applications where high performance is required. Viton, on the other hand, may be a more cost-effective option for applications where performance is not a top priority. Ultimately, the choice between FEP and Viton will depend on the specific requirements of your application and your budget constraints.