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Before you start installing oil seals, you need to choose the right size and type of oil seal for your application. Oil seals come in a variety of sizes and materials, so it's important to choose the right one for your needs. Consider factors such as temperature, pressure, and fluid compatibility when choosing an oil seal.

Polytetrafluoroethylene 
Chemical resistant 
Low coefficient of friction poor elastic properties not wear resistant if used by dynamic applications

Most oil seals consist of some basic elements that configure their structure, such as the sealing element, the metal case, and the spring:

Figure 14.4. Effect of aeration on oil aging.⁵ Chart shows percent retained elongation after aging for 28 days at 150°C in Mobil 276.