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- Material Selection The choice of seal material is critical. Common materials include rubber, polyurethane, and thermoplastics, each with distinct properties suitable for different applications. Temperature, pressure, and chemical compatibility must be considered during material selection.

2. 80% - Durability The durability of an oil seal accounts for 80% of its importance. This aspect encompasses the seal's ability to resist wear and tear over time. Seals must be manufactured from materials that can withstand harsh operating environments, including exposure to extreme temperatures, chemicals, and mechanical stress. Regular maintenance can help prolong the life of oil seals, but ultimately, the initial selection of a high-quality seal can make a significant difference in durability. In many instances, investing in better materials upfront results in fewer replacements and repairs in the long run.

As can be seen from the seal cross-section shown in Fig. 14.2, shaft seals are complex shapes that require advanced mold design and molding techniques (see Section 7.3 for discussion of fluoroelastomer molding). For some time, most shaft seals were made in the United States by compression molding. Injection molding of shaft seals is prevalent in Europe, and is being used increasingly in the United States. An advantage of compression molding is that preforms (usually rings cut from extruded tubing) are used that closely approximate the amount of stock required for the final parts, so compound waste is minimized. For injection molding, the amount of cured stock in the central sprue and runner (actually a thin sheet leading to the seal lip) is often large compared to the stock required for the final part, so the waste of high-cost fluoroelastomer may be high. Such waste is reduced in modern injection molding designs.