EPDM vs. Nitrile NBR

Attribute	EPDM	Nitrile NBR
Chemical Resistance	Good resistance to acids, alkalis, and ketones	Good resistance to oils, fuels, and greases
Temperature Range	-50°C to 150°C	-30°C to 120°C
Hardness	40-90 Shore A	50-90 Shore A
Compression Set	Low compression set	Higher compression set
Cost	Higher cost	Lower cost

Introduction

EPDM (Ethylene Propylene Diene Monomer) and Nitrile NBR (Nitrile Butadiene Rubber) are two popular types of synthetic rubber used in various industries. Both materials have unique properties that make them suitable for different applications. In this article, we will compare the attributes of EPDM and Nitrile NBR to help you understand their differences and choose the right material for your specific needs.

Chemical Composition

EPDM is a type of synthetic rubber made from ethylene, propylene, and a diene monomer. This composition gives EPDM excellent resistance to heat, ozone, and weathering. On the other hand, Nitrile NBR is made from butadiene and acrylonitrile, which provides it with superior oil and fuel resistance. The chemical composition of these two materials plays a significant role in determining their properties and applications.

Temperature Resistance

EPDM has a higher temperature resistance compared to Nitrile NBR. EPDM can withstand temperatures ranging from -50°C to 150°C, making it suitable for outdoor applications where exposure to extreme temperatures is a concern. Nitrile NBR, on the other hand, has a temperature range of -20°C to 100°C, which limits its use in high-temperature environments. If you require a material that can withstand a wide range of temperatures, EPDM would be the better choice.

Oil and Fuel Resistance

Nitrile NBR is known for its excellent oil and fuel resistance, making it a popular choice for applications involving contact with petroleum-based fluids. EPDM, on the other hand, has poor resistance to oil and fuel, which limits its use in environments where exposure to these substances is common. If your application requires resistance to oil and fuel, Nitrile NBR would be the more suitable option.

Weathering and Ozone Resistance

EPDM is highly resistant to weathering and ozone, making it ideal for outdoor applications where exposure to sunlight and harsh weather conditions is a concern. Nitrile NBR, on the other hand, is more susceptible to degradation from UV radiation and ozone exposure. If your application requires a material that can withstand outdoor conditions, EPDM would be the better choice due to its superior weathering and ozone resistance.

Compression Set

EPDM has a lower compression set compared to Nitrile NBR, which means it can maintain its shape and elasticity better over time. Nitrile NBR, on the other hand, has a higher compression set, which can lead to permanent deformation under pressure. If your application requires a material with good compression set resistance, EPDM would be the more suitable option.

Cost

In terms of cost, Nitrile NBR is generally more affordable than EPDM. This makes Nitrile NBR a cost-effective option for applications where budget is a primary concern. However, it is essential to consider the specific requirements of your application and choose a material that offers the best balance of performance and cost. While Nitrile NBR may be cheaper, EPDM's superior properties may justify the higher cost in certain applications.

Conclusion

In conclusion, EPDM and Nitrile NBR are two versatile materials with unique properties that make them suitable for different applications. EPDM offers superior temperature resistance, weathering, and ozone resistance, making it ideal for outdoor applications. Nitrile NBR, on the other hand, excels in oil and fuel resistance, making it a popular choice for applications involving petroleum-based fluids. When choosing between EPDM and Nitrile NBR, consider the specific requirements of your application to determine which material will best meet your needs.