FKM vs. Polyacrylate Rubber

Attribute	FKM	Polyacrylate Rubber
Chemical Structure	Fluorinated	Acrylate
Temperature Range	-20°C to 200°C	-30°C to 150°C
Resistance to Chemicals	Excellent	Good
Resistance to Ozone	Excellent	Good
Cost	Higher	Lower

Introduction

When it comes to choosing the right rubber material for various applications, it is important to consider the specific attributes of each type. Two commonly used rubber materials are FKM (fluoroelastomer) and polyacrylate rubber. Both materials have unique properties that make them suitable for different applications. In this article, we will compare the attributes of FKM and polyacrylate rubber to help you make an informed decision when selecting the right material for your needs.

Chemical Resistance

One of the key differences between FKM and polyacrylate rubber is their chemical resistance. FKM is known for its excellent resistance to a wide range of chemicals, including oils, fuels, acids, and solvents. This makes FKM a popular choice for applications where exposure to harsh chemicals is a concern. On the other hand, polyacrylate rubber has good resistance to oils and fuels, but it may not be as resistant to certain acids and solvents as FKM. Therefore, if chemical resistance is a critical factor in your application, FKM may be the better choice.

Temperature Resistance

Another important attribute to consider when comparing FKM and polyacrylate rubber is their temperature resistance. FKM has a higher temperature resistance compared to polyacrylate rubber, making it suitable for applications where high temperatures are a concern. FKM can withstand temperatures ranging from -20°C to 200°C, while polyacrylate rubber typically has a lower temperature range of -30°C to 150°C. If your application involves exposure to high temperatures, FKM would be the more suitable choice due to its superior temperature resistance.

Compression Set

Compression set refers to the ability of a rubber material to return to its original shape after being compressed. FKM has a lower compression set compared to polyacrylate rubber, meaning it can maintain its shape and sealing properties over a longer period of time. This makes FKM a preferred choice for applications where compression set is a concern, such as in seals and gaskets. On the other hand, polyacrylate rubber may experience higher levels of compression set over time, which could affect its performance in certain applications.

Flexibility and Elasticity

When it comes to flexibility and elasticity, both FKM and polyacrylate rubber exhibit good properties. However, FKM tends to have slightly better flexibility and elasticity compared to polyacrylate rubber. This makes FKM a preferred choice for applications where flexibility and elasticity are important, such as in O-rings and seals that require a high degree of flexibility to maintain a tight seal. Polyacrylate rubber, while still flexible and elastic, may not offer the same level of performance in applications that require extreme flexibility.

Abrasion Resistance

Abrasion resistance is another important attribute to consider when comparing FKM and polyacrylate rubber. FKM is known for its excellent abrasion resistance, making it suitable for applications where the rubber material is exposed to abrasive conditions. Polyacrylate rubber also offers good abrasion resistance, but it may not be as durable as FKM in high-wear applications. If your application involves exposure to abrasive conditions, FKM would be the better choice due to its superior abrasion resistance.

Conclusion

In conclusion, both FKM and polyacrylate rubber have unique properties that make them suitable for different applications. FKM offers superior chemical resistance, temperature resistance, compression set, flexibility, elasticity, and abrasion resistance compared to polyacrylate rubber. However, polyacrylate rubber may still be a suitable choice for applications where high chemical resistance is not required, and the operating temperature range is within its limits. Ultimately, the choice between FKM and polyacrylate rubber will depend on the specific requirements of your application and the attributes that are most important for its performance.