Buna N vs. Chloroprene

Attribute	Buna N	Chloroprene
Chemical Name	Butadiene Acrylonitrile	Polychloroprene
Common Name	Nitrile rubber	Neoprene
Temperature Range	-40°C to 120°C	-40°C to 121°C
Oil Resistance	Good	Good
Weather Resistance	Fair	Excellent
Flame Resistance	Good	Good

Introduction

Buna N and Chloroprene are two commonly used synthetic rubbers that have distinct attributes and applications. Understanding the differences between these materials can help in selecting the right material for specific industrial or commercial purposes.

Chemical Composition

Buna N, also known as Nitrile rubber, is a copolymer of butadiene and acrylonitrile. It is known for its excellent resistance to oil, fuel, and other chemicals. On the other hand, Chloroprene, also known as Neoprene, is a homopolymer of chloroprene. It offers good resistance to ozone, weathering, and moderate chemicals.

Physical Properties

Buna N has a higher tensile strength and abrasion resistance compared to Chloroprene. It also has better resistance to heat, making it suitable for applications where high temperatures are involved. Chloroprene, on the other hand, has better flexibility and low-temperature resistance, making it ideal for applications where flexibility is crucial.

Applications

Buna N is commonly used in applications where oil and fuel resistance are required, such as in gaskets, seals, and hoses in the automotive industry. It is also used in the manufacturing of conveyor belts and O-rings. Chloroprene, on the other hand, is widely used in applications where weathering resistance is important, such as in weather seals, roofing membranes, and wetsuits.

Cost

In terms of cost, Buna N is generally more cost-effective compared to Chloroprene. This makes it a preferred choice for applications where cost plays a significant role in material selection. However, the cost difference may vary depending on the specific grade and application requirements.

Environmental Impact

Both Buna N and Chloroprene are synthetic rubbers that are not biodegradable. However, Chloroprene is known to have a higher environmental impact due to the production process involving the use of chloroprene monomers. Buna N, on the other hand, has a relatively lower environmental impact in terms of production.

Conclusion

In conclusion, Buna N and Chloroprene have distinct attributes that make them suitable for different applications. While Buna N offers excellent oil and heat resistance, Chloroprene provides good flexibility and weathering resistance. The choice between these two materials depends on the specific requirements of the application, including chemical resistance, physical properties, cost, and environmental impact.