What should you take into account when selecting an oil seal? Different types of oil seals and various types of materials are available, each designed for specific uses. It is also important to select the right size of oil seal for the best results. For this reason, selecting the right oil seal requires adequate understanding of the application in which it will be used.
2. Choose the Right Oil Seal
- Furthermore, understanding the signs of a failing oil seal is important. Excessive oil leakage, unusual noises during operation, or a noticeable decrease in the car's handling and stability can all indicate a faulty oil seal. If detected early, a simple seal replacement can often rectify the issue, saving you from more extensive and costly repairs.
metal cased
These types are made with a metal outer case and a PTFE lip. They are suitable for a wide range of temperatures from -90 °C to +260 °C.These lip seals can also be used for higher pressures of up to 10 bar (special types up to 25 bar) and rotational speeds of up to 40-45 m/s. Certain grades of PTFE are suitable for use in pharmaceutical and food applications. One important point is that PTFE lip seals do require a shaft with a harder, smoother finish.


VMQ (silicone)
An oil seal is designed to perform three major functions: to prevent lubricants from leaking outside the seal even under high pressure, to act as a barrier to retain the lubricating oil, and to prevent dirt and other contaminants from entering the unit.
No matter the PTFE machining techniques and other processes used in making mechanical parts, they tend to fail due to some reasons. The same thing applies to oil seals. When they are exposed to some factors, they fail. The factors are stated below alongside the solutions.
Over time, the seal lip(s) will wear a shallow groove into the shafting due to the pressure the seal imposes upon it. Visible scoring on the shaft indicates a genuine possibility that the seal will not perform as well as intended. The potential for lubricants leaking out and particulates working their way through the seal drastically increases when placed over a worn location.

Mercedes-Benz
In general, oil seals should be selected in the order of priority indicated in Table 1.
From this kind of standard immersion testing, one would expect that bisphenol-cured VDF/HFP/TFE fluoroelastomers would not give good service life as oil seals. Similar tests with other elastomers, such as HNBR, silicone, and acrylic rubbers, show less loss of elongation. However, it is found that, in actual service, FKM shaft seals6 have much longer service life than seals of the other elastomers. In a Japanese study of FKM lip seals, rear crankshaft seals from high-mileage automobiles (70,000–280,000 mi ie, 110,000–450,000 km) were collected and examined. No serious oil leakage was found when the seals were removed from the engines. Some deposits were found around the seal lip and on the garter spring holding the lip against the shaft. No surface cracks were found on the seal lip, and only minor crazing on the crankcase side of the flexure portion of the seal in some samples. The seal compositions were not noted, but most were probably VDF/HFP/TFE elastomers with 68–69% fluorine content.
The oil seal achieved the limit of tolerances of 0.05 to 0.1 mm, and complies with ISO 9001 and IATF 16949 processes and standards. For advanced level, we will also give you the best solution to your industry field per your project. With our understanding of use and characteristics among rubber materials to make special combinations for different industries and applications, so the most suitable recommendation and best advice from Read More About Valve Oil Seal supplier Xingtai Huimao Trading Co.,Ltd. are available for your inquiry. The temperature resistance ranges from -50°C to 300°C, and shores from 25 to 90 shore A are available to meet industrial, military, aftermarket and international standards. Our materials for oil seals include NBR, FKM, ACM, SBR, EPDM, and so on, including specified materials based on your requirements. These categories of Oil seal included Fork Dust Seal, Valve Stem Seal, Power Steering Oil Seal, Brake Caliper Seal, Transmission Seal, Compressor Shaft Seal, as well as customized sealing.
Read More About Valve Oil Seal supplier Xingtai Huimao Trading Co.,Ltd. provides you with suitable materials per customer need, and uses the latest CAD / CAM technology to make drawings and samples for your approval, also meeting tolerance and standard. Therefore, if you have an inquiry for oil seal, please leave some information such as drawings or other details as below, so we can provide you with advanced planning and consulting services.
Figure 6: Recommended housing bore chamfers (shouldered bore)
The range of uses of peroxydically cross-linked EPDM includes in hot water and steam seals. EPDM is also very resistant to ageing and ozone. Compared with the usual types of synthesis natural rubber it has good resistance to cold temperatures. EPDM is not resistant to aliphatic or aromatic hydrocarbons or mineral oil products. Resistance to chemicals, and also to oxidising agents, is very good. Temperature range from -50 °C to +140 °C depending on type.
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