Nitrile elastomers (NBR) have been a mainstay of aerospace sealing applications for decades, offering proven performance in fuel and hydraulic systems where resistance to oils, fuels, and hydraulic fluids is essential. While fluoroelastomers and silicones have captured significant market share in extreme temperature applications, nitrile elastomers remain a cost-effective and reliable choice for many aerospace applications where operating temperatures are moderate and chemical resistance is the primary requirement.

Understanding Nitrile Elastomers

Nitrile elastomers are copolymers of acrylonitrile and butadiene, with the acrylonitrile content determining the balance between oil resistance and low-temperature flexibility. Higher acrylonitrile content provides better oil and fuel resistance but reduces low-temperature performance. Aerospace-grade nitrile elastomers are formulated to meet stringent requirements for sealing performance, compression set resistance, and fluid compatibility.

Key Aerospace Applications

Fuel System Seals
Nitrile elastomers provide reliable sealing in aircraft fuel systems where moderate temperatures and continuous fuel exposure are the primary challenges.

Hydraulic System Seals
Nitrile O-rings and seals are used in hydraulic systems where resistance to hydraulic fluids is essential.

Lubrication Systems
Nitrile seals are used in engine lubrication systems, providing resistance to oils and moderate temperatures.

General Sealing Applications
Nitrile elastomers remain a cost-effective choice for sealing applications where extreme temperatures and aggressive chemicals are not present.

Advantages of Nitrile Elastomers

Considerations for Nitrile Elastomers

Temperature Limitations
Nitrile elastomers have a narrower operating temperature range than fluorosilicone and perfluoroelastomer alternatives, typically -40°C to 100°C for continuous service.

Chemical Compatibility
While excellent with petroleum-based fluids, nitrile elastomers have limited resistance to polar solvents, hydraulic fluids, and oxygenated fuels.

Material Selection
The selection of nitrile elastomers for aerospace applications requires careful consideration of the specific operating conditions, including temperature range, fluid exposure, and pressure requirements.

Future Outlook

Nitrile elastomers are expected to maintain a steady role in aerospace sealing applications where their performance characteristics are sufficient and cost-effectiveness is a priority. However, the trend toward higher-temperature, more demanding operating conditions is likely to favor fluoroelastomer and perfluoroelastomer alternatives in new aircraft designs.

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