EPDM vs. Kalrez

Attribute	EPDM	Kalrez
Chemical Resistance	Good	Excellent
Temperature Range	-50°C to 150°C	-20°C to 325°C
Hardness	40-90 Shore A	70-95 Shore A
Cost	Lower	Higher

Introduction

EPDM (ethylene propylene diene monomer) and Kalrez are two popular materials used in various industries for their unique properties and applications. While both materials are known for their high performance and durability, there are key differences between them that make each suitable for specific uses. In this article, we will compare the attributes of EPDM and Kalrez to help you understand their strengths and weaknesses.

Chemical Composition

EPDM is a synthetic rubber material composed of ethylene, propylene, and a diene monomer. This composition gives EPDM its excellent resistance to heat, ozone, and weathering, making it a popular choice for outdoor applications. On the other hand, Kalrez is a perfluoroelastomer material that contains carbon, fluorine, and oxygen atoms. This unique composition gives Kalrez its exceptional chemical resistance, making it ideal for use in harsh chemical environments.

Temperature Resistance

EPDM has a temperature range of -50°C to 150°C, making it suitable for a wide range of applications where moderate temperature resistance is required. Kalrez, on the other hand, has a temperature range of -20°C to 325°C, making it ideal for high-temperature applications where other materials may fail. The superior temperature resistance of Kalrez makes it a preferred choice for industries such as aerospace, semiconductor, and oil and gas.

Chemical Resistance

EPDM offers good resistance to acids, alkalis, and polar solvents, making it suitable for applications where exposure to these chemicals is expected. However, EPDM may not be suitable for use in harsh chemical environments where strong acids or bases are present. Kalrez, on the other hand, offers excellent resistance to a wide range of chemicals, including acids, bases, solvents, and fuels. This makes Kalrez the material of choice for critical applications where chemical compatibility is essential.

Compression Set Resistance

EPDM has good compression set resistance, meaning it can maintain its shape and sealing properties even after being compressed over time. However, EPDM may not be suitable for applications where high compression set resistance is required. Kalrez, on the other hand, has excellent compression set resistance, making it ideal for applications where sealing performance is critical. The superior compression set resistance of Kalrez ensures long-term reliability and durability in demanding environments.

Cost

EPDM is a cost-effective material compared to Kalrez, making it a popular choice for applications where budget constraints are a concern. While Kalrez may be more expensive upfront, its superior performance and durability can result in cost savings in the long run by reducing maintenance and replacement costs. The choice between EPDM and Kalrez will depend on the specific requirements of the application and the budget constraints of the project.

Conclusion

In conclusion, EPDM and Kalrez are both high-performance materials with unique properties that make them suitable for a wide range of applications. While EPDM offers good temperature resistance and chemical compatibility at a lower cost, Kalrez excels in high-temperature and harsh chemical environments where superior performance is required. The choice between EPDM and Kalrez will ultimately depend on the specific requirements of the application and the desired performance characteristics. By understanding the attributes of EPDM and Kalrez, you can make an informed decision on which material is best suited for your needs.