Comparing and Contrasting Viton vs. Kalrez

When it comes to sealing solutions, Viton and Kalrez are two names that often come up in discussions. Both materials are renowned for their high-performance capabilities in demanding industrial environments. In this blog post, we'll compare and contrast the abilities of Viton and Kalrez to help you understand their strengths and applications.

Viton:
Viton is a brand of fluoroelastomer (FKM) known for its exceptional chemical resistance and temperature tolerance. Here are some key characteristics of Viton:

1. Chemical Resistance: Viton is highly resistant to a wide range of chemicals, including acids, fuels, oils, and solvents. This makes it an excellent choice for applications where exposure to harsh chemicals is common.
2. Temperature Range: Viton can withstand temperatures ranging from -20°C to 204°C (-4°F to 400°F). Its ability to maintain elasticity and sealing properties across this wide temperature range is one of its primary advantages.
3. Mechanical Properties: Viton exhibits good mechanical properties, such as tensile strength, tear resistance, and compression set resistance. This makes it suitable for sealing applications under high pressure and dynamic conditions.
4. Cost-Effectiveness: Compared to some other high-performance sealing materials, Viton can be a cost-effective option, especially considering its durability and longevity in challenging environments.

Kalrez:
Kalrez, on the other hand, is a perfluoroelastomer (FFKM) developed by DuPont. It is known for its extreme chemical resistance and thermal stability. Here are the key characteristics of Kalrez:

1. Chemical Resistance: Kalrez is virtually inert to nearly all chemicals, including acids, bases, solvents, and even plasma. This makes it ideal for critical applications where exposure to aggressive chemicals is a concern.
2. Temperature Range: Kalrez has an impressive temperature range, with some grades capable of withstanding temperatures from -29°C to 327°C (-20°F to 620°F). This high-temperature capability sets it apart in applications where extreme heat is a factor.
3. Purity and Cleanliness: Kalrez is known for its low outgassing and low contamination properties, making it suitable for use in industries such as semiconductor manufacturing, pharmaceuticals, and aerospace, where cleanliness is paramount.
4. Longevity and Reliability: Kalrez seals are renowned for their long service life and reliability, even in demanding operating conditions. This can lead to reduced maintenance and downtime costs over time.
Comparing Viton and Kalrez:

Chemical Resistance: Both Viton and Kalrez offer excellent chemical resistance, but Kalrez is often preferred for applications involving extremely harsh chemicals or where purity is critical.

Temperature Range: While Viton has a wide temperature range, Kalrez excels in high-temperature applications, making it suitable for environments where extreme heat is a concern.

Cost: Viton is generally more cost-effective than Kalrez, making it a preferred choice for applications that don't require the extreme capabilities of Kalrez.

Applications: Viton is commonly used in automotive, aerospace, and general industrial applications where chemical resistance and temperature tolerance are important but not extreme. Kalrez finds its niche in industries such as semiconductor, oil and gas, pharmaceuticals, and aerospace, where stringent performance requirements must be met.

In conclusion, both Viton and Kalrez are exceptional sealing materials with distinct strengths. The choice between them depends on the specific requirements of the application, including chemical exposure, temperature range, budget considerations, and industry standards.

Contact us today, so we can help determine which material will work best for your application.