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FLUID MEDIA AND PTFE SEALS:

You may not be aware of the fact that the fluid media has a significant effect on seal wear.  In this article, we are going to explore exactly how fluid media can affect the performance of your PTFE spring-energized seal.

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Need additional education? Check out these “Popular PTFE Post”  from Advanced EMC Technologies:


 

Wear and Lubrication

Fluid media can mean anything from liquid helium to fuel, alcohols, polymers, paint, hydraulic fluids, solvents, or simply air.  The type of fluid can impact seal wear.  For example, given the same seal PV values, gases will result in the greatest wear, followed by water and then oil.  Some liquids can also provide a degree of lubrication, which is likely why in our example oil results in the least amount of comparative wear.

 

Thermal Effects

Media present around the seal lip serves to dissipate heat that is generated at the seal interface, as well as reduce temperatures.  Heat contributes to adhesive wear, the main mechanism of wear for thermoplastic seals such as PTFE.  Excessive temperature can severely compromise the performance of a seal.

 

Required Surface Finish

The type of fluid also determines the surface finish of the hardware.  The table below shows the recommended surface finish based on the type of media, and whether or not it will be at cryogenic temperatures.

 

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Consider the type of media

When developing the specifications for your next spring-energized PTFE seal, don’t forget to take into account the type of media that will be involved. 

 

Get your copyof the Advanced EMC Technologies “High Performance Sealing Soluitons Guide.”

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