HNBR vs. Viton

Attribute	HNBR	Viton
Chemical Resistance	Good resistance to oils, fuels, and chemicals	Excellent resistance to oils, fuels, and chemicals
Temperature Range	-40°C to 150°C	-20°C to 200°C
Hardness	60-90 Shore A	70-90 Shore A
Compression Set	Low compression set	Low compression set
Cost	Lower cost	Higher cost

Introduction

When it comes to choosing the right material for seals, gaskets, and O-rings, two popular options are HNBR (Hydrogenated Nitrile Butadiene Rubber) and Viton (Fluoroelastomer). Both materials have their own unique set of attributes that make them suitable for different applications. In this article, we will compare the key characteristics of HNBR 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. HNBR is known for its excellent resistance to oil, fuel, and other hydrocarbons. It can withstand exposure to a wide range of chemicals, making it a popular choice for automotive and oil industry applications. On the other hand, Viton is highly resistant to a broader range of chemicals, including acids, solvents, and harsh fuels. This makes Viton the preferred choice for applications where exposure to aggressive chemicals is a concern.

Temperature Resistance

Another critical attribute to consider is the temperature resistance of the material. HNBR has a temperature range of -40°C to 150°C, making it suitable for a wide range of applications. However, Viton has a higher temperature resistance, with a range of -20°C to 200°C. This makes Viton a better choice for applications that require sealing at higher temperatures.

Compression Set

Compression set refers to the ability of a material to retain its shape after being compressed. HNBR has a lower compression set compared to Viton, meaning it can maintain its sealing properties over a longer period of time. This makes HNBR a preferred choice for applications where long-term sealing performance is crucial. On the other hand, Viton has a higher compression set, which may result in reduced sealing effectiveness over time.

Abrasion Resistance

Abrasion resistance is another important attribute to consider, especially in applications where the sealing material is exposed to mechanical wear. HNBR has good abrasion resistance, making it suitable for applications where the seal may come into contact with abrasive materials. Viton, on the other hand, has excellent abrasion resistance, making it ideal for applications where the seal is subjected to high levels of wear and tear.

Cost

Cost is always a factor to consider when choosing a sealing material. HNBR is generally more cost-effective compared to Viton, making it a popular choice for applications where budget constraints are a concern. However, it is essential to weigh the cost against the performance requirements of the application to determine the most suitable material for the job.

Conclusion

In conclusion, both HNBR and Viton have their own unique set of attributes that make them suitable for different applications. HNBR offers excellent chemical resistance, temperature resistance, and compression set, making it a preferred choice for applications where these attributes are crucial. On the other hand, Viton provides superior resistance to a broader range of chemicals, higher temperature resistance, and excellent abrasion resistance, making it ideal for applications where exposure to aggressive chemicals and mechanical wear is a concern. Ultimately, the choice between HNBR and Viton will depend on the specific requirements of the application and the trade-offs between performance and cost.