- The double lip configuration is no mere coincidence; it serves a dual purpose that enhances its effectiveness. The primary lip faces outward, bravely confronting the harsh external environment to prevent dirt, water, and other contaminants from infiltrating the system. Meanwhile, the secondary lip guards against the escape of lubricating oil, ensuring that the machine's moving parts are adequately nourished. This harmonious partnership between the two lips ensures not only the longevity of the seal but also the efficiency and reliability of the equipment it protects.
The major cause of extrusion and nibbling is stress caused by high pressure. This is commonly noticed when the oil seal has a chipped or nibbled look. In fact, in some cases, the surface of the seal tends to peel on its own, which makes it have a shaved look. What the stress does is that it increases the clearance gap between the mating edges, which causes the seal to get entrapped, and then leads to severe physical damage.
Valve Cover Gasket Set: Comprehensive Sealing Solutions
Purpose of an Oil Seal

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One way to recognize an improperly installed seal is by checking whether or not there is uneven shearing of the rubber after use. If this is evident, adjust by aligning the installation tools properly before pressing the seal into place.
What are Oil Seals and how should they be ordered?
J: Additional code is added here as an identifier when two or more seals have exactly the same type codes and dimensional numbers.
HIGH-QUALITY INDUSTRIAL OIL SEALS
In the UK, customers have a range of options for purchasing oil seals. There are several reputable UK gasket manufacturers that offer a wide selection of oil seals to meet various industrial needs.

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Oil seals are made from multiple compounds and materials. Some of the oldest, still in use today, are leather and felt compounds. The trend in mass production, however, has seen a move towards synthetic rubber or elastomers. Nitrile is by far the most popular material but developments in PTFE have created a surge of interest in buyers needing seals for high-speed shaft rotation applications. Viton is taking over from the polyacrylic and silicone, as it works better in high-temperature applications and has a high-resistance to abrasion and harmful chemicals.
When the total eccentricity is excessive, the sealing edge of the seal lip cannot accommodate shaft motions and leakage may occur.
Total eccentricity is the sum of shaft runout and the housing-bore eccentricity.
Total eccentricity, shaft runout and housing-bore eccentricity are generally expressed in TIR (Total Indicator Reading).