Most oil seals consist of some basic elements that configure their structure, such as the sealing element, the metal case, and the spring:
- However, before finalizing a purchase, it is wise to consult your vehicle's manual or a professional mechanic. They can offer advice tailored to your engine’s specifications, ensuring you get the most out of your investment. Additionally, remember that changing spark plugs is a delicate procedure that requires care to avoid damage to the threads or the plug itself.
- Radial lip seals are the most common type of oil seal used to prevent leakage of fluids such as oil or grease in rotating machinery. They consist of a metal outer casing with an elastomeric sealing lip that is pressed against the shaft to create a tight seal.
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Oil seals made of HNBR are characterised by excellent properties that include high resistance to mineral oils with additives, low steam and gas permeability, good cold flexibility down to -30 °C depending on type, good ozone resistance and friction resistance. HNBR seals withstand heat up to 150°C.

Oil seals, also known as rotary shaft seals or lip seals, are a specific type of gasket designed to prevent the leakage of oil or other fluids in rotating shafts.
Necessary to check compatibility with fluids
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Oil seals are always exposed to a lot of chemicals, both mild and harsh chemicals. The seals react by showing some signs like cracks, blisters, and discoloration especially when the chemical is harsh. This clearly shows that the chemical is not compatible with the seal, which goes as far as affecting its cross-link density (increase or decrease). When the cross-link density increases, the seal material becomes harder, but when it decreases, the seal material becomes softer.
DIN


Oil seals can also be known as rotary shafts seals, shaft seals, lip seals, elastomeric seals, and more.