FKM-B vs. Viton

Attribute	FKM-B	Viton
Chemical Resistance	Good	Excellent
Temperature Range	-20°C to 200°C	-20°C to 200°C
Hardness	70-90 Shore A	70-90 Shore A
Compression Set	Good	Excellent
Tensile Strength	Good	Excellent

Introduction

FKM-B and Viton are both high-performance elastomers known for their excellent resistance to heat, chemicals, and oils. While they share many similarities, there are also key differences between the two materials that make them suitable for different applications. In this article, we will compare the attributes of FKM-B and Viton to help you make an informed decision when choosing between the two.

Chemical Composition

FKM-B and Viton are both fluoroelastomers, which means they contain fluorine atoms in their chemical structure. However, FKM-B is a specific type of Viton that has a higher fluorine content compared to standard Viton grades. This higher fluorine content in FKM-B results in improved chemical resistance, making it ideal for applications where exposure to harsh chemicals is a concern.

Temperature Resistance

Both FKM-B and Viton exhibit excellent heat resistance, with the ability to withstand temperatures ranging from -20°C to 200°C. However, FKM-B has a slightly higher temperature resistance compared to standard Viton grades, allowing it to perform well in extreme heat conditions. This makes FKM-B a preferred choice for applications where high temperatures are a factor.

Compression Set

Compression set refers to the ability of an elastomer to return to its original shape after being compressed. FKM-B has a lower compression set compared to standard Viton grades, which means it maintains its sealing properties over a longer period of time. This makes FKM-B a reliable choice for applications where long-term sealing performance is crucial.

Fluid Resistance

Both FKM-B and Viton are known for their excellent resistance to a wide range of fluids, including oils, fuels, and solvents. However, FKM-B has superior fluid resistance compared to standard Viton grades, making it a preferred choice for applications where exposure to aggressive fluids is a concern. FKM-B is particularly well-suited for use in the automotive and aerospace industries where exposure to fuels and hydraulic fluids is common.

Cost

When it comes to cost, FKM-B is typically more expensive than standard Viton grades due to its higher fluorine content and superior performance attributes. While the initial cost of FKM-B may be higher, its long-term durability and resistance to harsh environments can result in cost savings over time. It is important to consider the specific requirements of your application when evaluating the cost-effectiveness of FKM-B versus Viton.

Conclusion

In conclusion, both FKM-B and Viton are high-performance elastomers with excellent heat resistance, chemical resistance, and fluid resistance. While FKM-B offers superior performance attributes compared to standard Viton grades, it also comes at a higher cost. When choosing between FKM-B and Viton, it is important to consider the specific requirements of your application and weigh the benefits of each material. Ultimately, the decision between FKM-B and Viton will depend on factors such as temperature resistance, compression set, fluid resistance, and cost.