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Oil seals, also known as lip seals or rotary shaft seals, are critical components used to prevent the leakage of fluids, such as oils and lubricants, from rotary shafts or around stationary components. They serve a dual purpose keeping contaminants out and ensuring lubricants stay in, thereby ensuring the efficient functioning of machinery.

2. Material Composition Oil seals are typically made from various elastomers like nitrile rubber (NBR), fluoroelastomer (FKM), or silicone, depending on the application requirements. The percentages could also hint at the ratio of different materials used in the seal to enhance its performance in specific environments, such as high temperatures or chemical exposure.

The design of high pressure rotary seals considers several key factors, including the type of fluid being sealed, operating temperature, pressure, and the speed of rotation. Typically, they are made from advanced materials like elastomers, PTFE (polytetrafluoroethylene), and specialty composites that can endure extreme conditions. The seal's design often incorporates a lip that makes contact with the rotating shaft, creating a barrier against the pressure.