Chemraz vs. Kalrez

Attribute	Chemraz	Kalrez
Temperature Range	-20°C to 316°C	-29°C to 327°C
Chemical Resistance	Excellent	Excellent
Compression Set Resistance	Good	Excellent
Hardness	70-90 Shore A	70-95 Shore A

Introduction

Chemraz and Kalrez are two popular types of perfluoroelastomers that are widely used in various industries for their excellent chemical resistance and thermal stability. While both materials offer similar benefits, they also have distinct attributes that make them suitable for different applications. In this article, we will compare the key characteristics of Chemraz and Kalrez to help you make an informed decision when choosing between the two.

Chemical Resistance

Chemraz is known for its exceptional chemical resistance, particularly to a wide range of aggressive chemicals, including acids, bases, and solvents. It can withstand exposure to harsh chemicals without degrading or losing its physical properties. On the other hand, Kalrez also offers excellent chemical resistance, but it is specifically designed to resist more extreme chemicals, such as hot acids and steam. This makes Kalrez a preferred choice for applications where exposure to highly corrosive substances is a concern.

Temperature Range

When it comes to temperature resistance, both Chemraz and Kalrez can withstand high temperatures without losing their elasticity or mechanical properties. Chemraz has a temperature range of -20°C to 316°C, making it suitable for a wide range of applications where temperature fluctuations are common. Kalrez, on the other hand, has a higher temperature range of -29°C to 327°C, making it ideal for applications that require even higher heat resistance.

Compression Set

Compression set refers to the ability of a material to recover its original shape after being compressed. Chemraz has a low compression set, which means it can maintain its sealing properties even after prolonged compression. Kalrez, on the other hand, has an even lower compression set, making it ideal for applications where a tight seal is critical. This attribute makes Kalrez a preferred choice for high-pressure and high-temperature applications.

Physical Properties

Both Chemraz and Kalrez exhibit excellent physical properties, such as high tensile strength, tear resistance, and elongation at break. These properties make them highly durable and long-lasting, even in demanding operating conditions. However, Kalrez has slightly better mechanical properties compared to Chemraz, making it a preferred choice for applications that require superior performance under extreme conditions.

Cost

One of the key factors to consider when choosing between Chemraz and Kalrez is the cost. Chemraz is generally more cost-effective compared to Kalrez, making it a preferred choice for applications where budget constraints are a concern. However, the higher cost of Kalrez is justified by its superior performance and durability, making it a worthwhile investment for applications that require the highest level of reliability and performance.

Applications

Chemraz and Kalrez are both used in a wide range of industries, including chemical processing, semiconductor manufacturing, pharmaceuticals, and oil and gas. Chemraz is commonly used in applications where a high level of chemical resistance is required, such as seals, gaskets, and O-rings. Kalrez, on the other hand, is preferred for applications that involve exposure to extreme temperatures and aggressive chemicals, such as in the aerospace and automotive industries.

Conclusion

In conclusion, both Chemraz and Kalrez are excellent choices for applications that require high chemical resistance, temperature stability, and durability. While Chemraz is more cost-effective and offers good overall performance, Kalrez stands out for its superior chemical resistance, temperature range, and mechanical properties. Ultimately, the choice between Chemraz and Kalrez will depend on the specific requirements of your application and the level of performance and reliability you need.