Which materials are commonly used as seals with petroleum-based hydraulic fluids?

Buna-N, also known as Nitrile rubber, is a commonly used sealing material in systems that utilize petroleum-based hydraulic fluids due to its excellent compatibility with oils and fuels. It exhibits good resistance to compression set, making it suitable for use in dynamic sealing applications where it needs to deform and recover without significant wear. Neoprene is also utilized for similar reasons; it has good resistance to oil, weather conditions, and can withstand moderate temperatures.

These materials provide a reliable barrier and maintain performance under the conditions typically found in hydraulic systems that use petroleum-based fluids, ensuring that seals perform effectively without degrading or leaking over time. The combination of both Buna-N and Neoprene offers a good balance of durability, flexibility, and resistance to hydraulic fluid characteristics, making them prevalent choices in hydraulic systems.

Other materials listed, while useful in various contexts, may have limitations when it comes to compatibility and performance specifically with petroleum-based fluids, which is why they are not typically chosen for this application.