DCY DC AW3055 Oil Seal Ring NBR Metal Rubber FKM Double Spring Oil Seal High Pressure

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Oil seal dimensions
Our range includes oil seals in various sizes. Always keep in mind the dimensions of the groove where you will install the oil seal. Once you know the shaft diameter, groove diameter and groove width, you can easily select the right product

Lip materials
Most oil seals consist of an outer metal jacket, or a metal insert inside a rubber jacket, and a sealing lip. The metal outer jacket or insert acts as a base and determines the shape and size of the product. In most cases, the sealing lip and the jacket or insert are made of different materials. A brief summary of the most popular lip materials and their properties is included below
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Oil seals with a lip made from NBR
Most sealing lips are made of NBR. This material has many desirable properties. For example, it is highly resistant to various types of hydraulic oil and lubricating oil. However, NBR is not very resistant to ozone, UV radiation and high temperatures (above +120°C).

Oil seals with a lip made from FKM
FKM, commonly referred to by the brand name Viton, is the sealing lip material to use for applications involving high temperatures (up to +180°C). Furthermore, the standard compounds are resistant to many strong acids and bases, but not to hot water or steam. Only a few special FKM compounds are suitable for applications that involve unusually low temperatures (-40°C or lower).

Oil seals with a lip made of VMQ
VMQ (silicone) does suit some applications, but is not often used as a material for oil seals. The reason is that VMQ has low mechanical strength, which makes it less suitable for dynamic applications. The material does however withstand both low (-60°C) and high (+200°C) temperatures well. It is also flexible.

Metal exterior
Oil seals with metal outer jackets are often cheaper than those with rubber jackets. They are more difficult to install though. To prevent leakage past the outer jacket, the type of metal used for your oil seal needs to be the same as that of the groove in your application. This avoids a mismatch between the coefficients of expansion. When replacing a oil seal, a product with a rubber jacket may be better in some cases.