- Fiberglass Used in certain applications, fiberglass casing is lightweight and resistant to corrosion, making it suitable for certain environments.
- Polyacrylate Oil Seals – Are mostly used in automotive and transmission industries as they can withstand fuel, oil, ozone, sunlight, and weather when used. With cars being exposed these daily they are the perfect choice. They do however become increasingly less flexible the lower the temperature gets.
The temperature within the oil seal environment is the main factor that dictates the composition of an oil seal. Generally, there is a range of set temperatures that are optimal for that material. If the operating environment is too cold, the seal may become brittle and, at high temperatures, the seal material may show increased elasticity and become leaky.
- Polytetrafluoroethylene (PTFE): This fluoropolymer is known by the brand name Teflon and is known to assure the best chemical resistance and exceptionally little frictional resistance. It is the material of choice for several types of rotating seals used in the chemical, food, and pharmaceutical industries.
Oil seal size
Due to having a higher density, Viton has the widest temperature range of -40°F to over 400°F (-40°C to over 240°C) making it a perfect choice for higher temperature applications. Viton® also has the largest range of chemical resistance, i.e., it is resistant to silicone oil and grease, mineral/vegetable oil and grease, aliphatic, aromatic, and chlorinated hydrocarbons, non-flammable hydraulic fuels as well methanol fuels, and more.
With minor lip
Type code
Table 3: Features of each seal type
Material Selection:
DIN
You may need to take off the air cleaner (See Air filter change ), which may also have pipe connections.
Lubricant Amount - Seals will always perform best when lubricated, however in some machines there are more likely to be dry spells. For these cases, selecting a leather or PTFE seal will be beneficial, as both can operate with less lubrication than others.
Why Is Bearing A Seal Important?
As shown in Figure 1, sealing devices come in two types: contact and non-contact.
Oil seals are among the major contact type sealing devices.

m20 valve cover gasket.