FPM vs. HNBR

Attribute	FPM	HNBR
Chemical Resistance	Excellent	Excellent
Temperature Range	-15°C to 204°C	-30°C to 150°C
Hardness Range	50-90 Shore A	60-90 Shore A
Compression Set Resistance	Good	Good
Tensile Strength	Good	Good

Introduction

Fluorocarbon rubber (FPM) and hydrogenated nitrile butadiene rubber (HNBR) are two popular elastomers used in various industries for their unique properties. In this article, we will compare the attributes of FPM and HNBR to help you understand their differences and choose the right material for your specific application.

Chemical Composition

FPM, also known as Viton, is a type of synthetic rubber made from fluorinated hydrocarbon polymers. It contains fluorine atoms that provide excellent resistance to chemicals, oils, and high temperatures. On the other hand, HNBR is a hydrogenated version of nitrile butadiene rubber, which means it has been modified with hydrogen atoms to improve its heat and chemical resistance.

Temperature Resistance

One of the key differences between FPM and HNBR is their temperature resistance. FPM can withstand temperatures ranging from -20°C to 200°C, making it suitable for applications where high heat is a concern. HNBR, on the other hand, has a broader temperature range of -40°C to 150°C, making it a good choice for applications that require flexibility in extreme cold conditions.

Chemical Resistance

Both FPM and HNBR offer excellent resistance to a wide range of chemicals, including oils, fuels, acids, and solvents. However, FPM is known for its superior resistance to harsh chemicals such as acids, alkalis, and solvents, making it a preferred choice for applications where exposure to aggressive substances is a concern. HNBR, on the other hand, is more resistant to oils and fuels, making it a popular choice for automotive and oil industry applications.

Compression Set

Compression set refers to the ability of a material to retain its shape after being compressed. FPM has a lower compression set compared to HNBR, which means it can maintain its original shape and sealing properties over a longer period of time. This makes FPM a preferred choice for applications where sealing performance is critical and long-term durability is required.

Abrasion Resistance

Abrasion resistance is another important factor to consider when choosing between FPM and HNBR. FPM has excellent resistance to abrasion, making it suitable for applications where the material is subjected to wear and tear. HNBR, on the other hand, has good abrasion resistance but may not perform as well as FPM in high-wear environments.

Cost

Cost is often a deciding factor when choosing between FPM and HNBR. FPM is generally more expensive than HNBR due to its superior chemical resistance and temperature range. However, the higher cost of FPM may be justified in applications where its unique properties are required to ensure optimal performance and longevity.

Conclusion

In conclusion, both FPM and HNBR have their own set of advantages and disadvantages, making them suitable for different applications. FPM offers superior chemical resistance and temperature range, while HNBR provides good resistance to oils and fuels. When choosing between FPM and HNBR, it is important to consider factors such as temperature requirements, chemical exposure, compression set, abrasion resistance, and cost to determine the best material for your specific application.