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  • Well-balanced in terms of resistance to abrasion and high and low temperatures

  • The primary function of oil seals is to prevent the leakage of oil and other fluids in machinery. They help to maintain the proper lubrication of moving parts, extend the life of the equipment, and prevent contamination from external elements. Oil seals are crucial in ensuring the smooth operation and efficiency of machines, as any leakage can lead to reduced performance and potential damage to the equipment.
  • Silicone-Oil-Seal
  • Silicone rubber (VMQ)

  • Operating temperatures for engine oil seals (see Fig. 14.11 and cross-section of lip seal with garter spring in Fig. 14.22) vary widely, depending on engine design and location within the engine. Typically, the rear crankshaft seal is subjected to much higher temperatures than the front seal. Oil sump temperatures vary considerably, depending on provisions for oil cooling. This allows use of hydrogenated nitrile (HNBR), silicone, or acrylic elastomers for some seals in relatively low-temperature environments (120–140°C or 250–284°F). Standard fluoroelastomers (FKM), bisphenol-cured VDF/HFP/TFE terpolymers with 68–69% fluorine content, perform well in oil service up to about 160°C (320°F). More resistant fluoroelastomers are necessary for reliable long-term performance in more severe environments.