EPDM vs. Fluorocarbon

Attribute	EPDM	Fluorocarbon
Chemical Resistance	Good resistance to acids, alkalis, and ketones	Excellent resistance to chemicals, oils, and solvents
Temperature Range	-50°C to 150°C	-20°C to 200°C
Weather Resistance	Good resistance to weathering and ozone	Excellent weather resistance
Compression Set	Higher compression set compared to Fluorocarbon	Lower compression set compared to EPDM
Cost	Generally lower cost	Higher cost

Introduction

EPDM (ethylene propylene diene monomer) and Fluorocarbon (Viton) are two popular elastomers used in various industries for their unique properties and applications. Understanding the differences between these two materials can help in selecting the right material for specific requirements.

Chemical Composition

EPDM is a synthetic rubber made from ethylene, propylene, and a diene monomer. It is known for its excellent resistance to weathering, ozone, and UV exposure. On the other hand, Fluorocarbon is a type of synthetic rubber made from fluorine, carbon, and hydrogen. It offers superior chemical resistance to oils, fuels, acids, and solvents.

Temperature Resistance

EPDM has a temperature range of -50°C to 150°C, making it suitable for applications where moderate temperature resistance is required. Fluorocarbon, on the other hand, has a wider temperature range of -20°C to 200°C, making it ideal for high-temperature applications.

Compression Set

EPDM has a lower compression set compared to Fluorocarbon, meaning it can maintain its shape and sealing properties over a longer period of time. Fluorocarbon, on the other hand, has a higher compression set, which may result in decreased sealing effectiveness over time.

Chemical Resistance

EPDM offers good resistance to water, steam, and polar solvents, but it may not be suitable for applications involving oils, fuels, and hydrocarbons. Fluorocarbon, on the other hand, excels in resisting oils, fuels, acids, and harsh chemicals, making it a preferred choice for such applications.

Physical Properties

EPDM has good tensile strength, tear resistance, and flexibility, making it suitable for applications where these properties are important. Fluorocarbon, on the other hand, has excellent resistance to abrasion, tearing, and punctures, making it ideal for demanding environments.

Cost

EPDM is generally more cost-effective compared to Fluorocarbon, making it a preferred choice for applications where budget constraints are a concern. Fluorocarbon, on the other hand, is a premium material with higher costs, but its superior performance justifies the investment in certain applications.

Applications

EPDM is commonly used in roofing membranes, automotive seals, weatherstripping, and gaskets due to its weather resistance and flexibility. Fluorocarbon, on the other hand, is preferred in aerospace, automotive, and chemical processing industries where high chemical resistance and temperature stability are required.

Conclusion

Both EPDM and Fluorocarbon have their own unique properties and applications. The choice between the two materials depends on specific requirements such as temperature resistance, chemical compatibility, physical properties, and budget constraints. Understanding the differences between EPDM and Fluorocarbon can help in selecting the right material for a particular application.