What is the Difference Between Buna N and Viton?

The main differences between Buna N and Viton® are their temperature and chemical resistance properties. Here is a comparison of their key characteristics:

Buna N:

• Temperature range: Effective up to 250°F (121°C) and can withstand temperatures down to -40°F (-40°C).
• Chemical resistance: Buna N is less resistant to chemicals than Viton® and is not suitable for ozone or weather exposure.
• Strength: Buna N offers superior strength and is more resistant to oils and acids than natural rubber, but its flexibility is limited.

Viton®:

• Temperature range: Viton® standard compounds can withstand temperatures up to 446°F (230°C) and can last up to 48 hours at 600°F (315°C). However, it becomes hard and inflexible at temperatures below 5°F (-15°C).
• Chemical resistance: Viton® offers excellent resistance to chemicals, ozone, weatherability, mold, fungus, oxidation, and UV exposure.
• Applications: Viton® is suitable for high-temperature applications and has universal chemical resistance for sealing applications involving oils, fuels, and mineral acids.

In summary, Viton® is superior for high-temperature applications and offers better chemical resistance, while Buna N is more effective at low temperatures. Environmental factors also differentiate the two materials, with Viton® offering better resistance to ozone and weather exposure than Buna N.

Comparative Table: Buna N vs Viton

Here is a table comparing the differences between Buna N and Viton:

Both Buna N and Viton are commonly used elastomers for rubber seals and sealing devices, offering excellent resistance properties. They are often used in similar applications, such as aircraft and automotive, but their specific properties make them suitable for different applications. Buna N is ideal for applications involving exposure to fuel, hydraulic fluids, and water, while Viton is superior for high-temperature applications and chemical resistance.