- Despite their many advantages, black spark plugs are not without their drawbacks. One potential downside is that the black coating can wear off over time, especially in engines that operate at very high temperatures. This can diminish the spark plug's ability to dissipate heat effectively and may eventually lead to reduced performance or engine damage.
1. What are oil seals?
In addition to the installation procedure, our specialists and suppliers would also like to draw your attention to some cases that occur around oil seals.
2. Temperature: Just like pressure, it is very important to choose the right seal that can withstand extreme heat or cold temperatures, depending on the operating environment of your application.
Because of the higher temperature resistance of FKM, this material is also chosen for applications where higher speeds play a role, which raise the temperature at the sealing lip considerably. Usually, using FKM will result in a longer life than using NBR. This compensates the higher price of FKM compared to NBR, as an FKM does not have to be replaced as frequently. The low temperature resistance of standard FKM is limited to -15 ˚C.
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.
Jiri George Drobny, in Fluoroelastomers Handbook (Second Edition), 2016
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.
Table 6: Selection of metal case and spring materials

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