NBR vs. Polyacrylate Rubber

Attribute	NBR	Polyacrylate Rubber
Chemical Structure	Butadiene and Acrylonitrile	Acrylate monomers
Temperature Range	-40°C to 120°C	-30°C to 150°C
Oil Resistance	Excellent	Good
Abrasion Resistance	Good	Good
Compression Set	Good	Good

Introduction

When it comes to choosing the right rubber material for a specific application, it is important to consider the attributes of different types of rubber. Two commonly used rubbers in various industries are NBR (Nitrile Butadiene Rubber) and Polyacrylate Rubber. Both rubbers have unique properties that make them suitable for different applications. In this article, we will compare the attributes of NBR and Polyacrylate Rubber to help you make an informed decision.

Chemical Composition

NBR is a synthetic rubber copolymer of acrylonitrile and butadiene. The percentage of acrylonitrile in NBR can vary, which affects its chemical resistance and flexibility. On the other hand, Polyacrylate Rubber is a type of synthetic rubber that is derived from acrylic acid. It is known for its excellent resistance to heat, oil, and chemicals. The chemical composition of both rubbers plays a significant role in determining their properties and performance in different applications.

Physical Properties

One of the key differences between NBR and Polyacrylate Rubber lies in their physical properties. NBR is known for its excellent resistance to oil, fuel, and other petroleum-based fluids. It also has good abrasion resistance and low-temperature flexibility. Polyacrylate Rubber, on the other hand, has superior heat resistance and can withstand high temperatures without losing its properties. It also has good resistance to ozone and weathering.

Mechanical Properties

When it comes to mechanical properties, NBR and Polyacrylate Rubber exhibit different characteristics. NBR has good tensile strength, tear resistance, and compression set properties. It is also known for its excellent elongation and resilience. Polyacrylate Rubber, on the other hand, has high tensile strength and good abrasion resistance. It is also known for its low compression set and good flexibility.

Temperature Resistance

Temperature resistance is an important factor to consider when choosing a rubber material for high-temperature applications. NBR has a temperature range of -40°C to 120°C, making it suitable for a wide range of temperatures. Polyacrylate Rubber, on the other hand, has a higher temperature range of -30°C to 175°C, making it ideal for applications that require resistance to high temperatures. Both rubbers have good heat resistance, but Polyacrylate Rubber can withstand higher temperatures.

Chemical Resistance

Chemical resistance is another crucial factor to consider, especially in applications where the rubber will come into contact with various chemicals. NBR has good resistance to oil, fuel, and other petroleum-based fluids. It also has good resistance to water, hydraulic fluids, and alcohols. Polyacrylate Rubber, on the other hand, has excellent resistance to heat, oil, and chemicals. It can withstand exposure to acids, alkalis, and solvents without degrading.

Applications

Both NBR and Polyacrylate Rubber have a wide range of applications across different industries. NBR is commonly used in automotive seals, gaskets, O-rings, and hoses due to its excellent oil resistance. It is also used in fuel systems, hydraulic systems, and refrigeration systems. Polyacrylate Rubber, on the other hand, is used in high-temperature applications such as seals, gaskets, and hoses in engines, transmissions, and other automotive components. It is also used in oil and gas applications, chemical processing, and industrial equipment.

Conclusion

In conclusion, both NBR and Polyacrylate Rubber have unique properties that make them suitable for different applications. NBR is known for its excellent oil resistance and low-temperature flexibility, while Polyacrylate Rubber excels in high-temperature applications and chemical resistance. When choosing between the two rubbers, it is important to consider the specific requirements of the application and select the rubber that best meets those requirements. By understanding the attributes of NBR and Polyacrylate Rubber, you can make an informed decision and ensure the success of your project.